{"id":81395,"date":"2024-11-25T09:10:09","date_gmt":"2024-11-25T02:10:09","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=81395"},"modified":"2024-11-25T09:10:09","modified_gmt":"2024-11-25T02:10:09","slug":"cau-hoi-phong-van-front-end","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/","title":{"rendered":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Frontend_la_gi_Frontend_Developer_la_gi\" >Frontend l\u00e0 g\u00ec? Frontend Developer l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Cau_hoi_phong_van_Front_end_ve_HTML_va_CSS\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 HTML v\u00e0 CSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Cau_hoi_phong_van_Front_end_ve_JavaScript\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 JavaScript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Cau_hoi_phong_van_Front_end_ve_Framework_va_Thu_vien\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 Framework v\u00e0 Th\u01b0 vi\u1ec7n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Cau_hoi_phong_van_Front_end_ve_quy_trinh_lap_trinh_va_cong_cu\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 quy tr\u00ecnh l\u1eadp tr\u00ecnh v\u00e0 c\u00f4ng c\u1ee5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#Tong_ket_cau_hoi_phong_van_Front_End\" >T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End<\/a><\/li><\/ul><\/nav><\/div>\n<p><em><strong>Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec s\u1ebd cung c\u1ea5p nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End d\u00e0nh cho Front End Developer, Web Developer,&#8230; v\u1edbi \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ki\u1ebfn th\u1ee9c: HTML, CSS, JavaScript, Framework, Th\u01b0 vi\u1ec7n Frontend,&#8230; D\u00f9 b\u1ea1n l\u00e0 ng\u01b0\u1eddi m\u1edbi hay l\u00e0 ng\u01b0\u1eddi \u0111\u00e3 c\u00f3 kinh nghi\u1ec7m, nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End k\u00e8m theo c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft sau \u0111\u00e2y \u0111\u1ec1u r\u1ea5t c\u1ea7n thi\u1ebft v\u00e0 c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n ghi \u0111i\u1ec3m v\u1edbi nh\u00e0 tuy\u1ec3n d\u1ee5ng.<\/strong><\/em><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ecdc b\u00e0i vi\u1ebft \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frontend l\u00e0 g\u00ec? Frontend Developer l\u00e0 g\u00ec?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 HTML v\u00e0 CSS<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 JavaScript<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 Framework v\u00e0 th\u01b0 vi\u1ec7n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 quy tr\u00ecnh l\u1eadp tr\u00ecnh v\u00e0 c\u00f4ng c\u1ee5<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frontend_la_gi_Frontend_Developer_la_gi\"><\/span><b>Frontend l\u00e0 g\u00ec? Frontend Developer l\u00e0 g\u00ec?<\/b><i><\/i><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">L\u1eadp tr\u00ecnh Frontend l\u00e0 t\u1ea1o ra giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng (UI) c\u1ee7a c\u00e1c trang web. N\u00f3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u do backend g\u1eedi l\u00ean theo m\u1ed9t \u0111\u1ecbnh d\u1ea1ng t\u01b0\u01a1ng t\u00e1c v\u00e0 d\u1ec5 \u0111\u1ecdc. M\u1ed9t l\u1eadp tr\u00ecnh vi\u00ean Frontend &#8211; Frontend Developer l\u00e0 ng\u01b0\u1eddi l\u00e0m vi\u1ec7c v\u1edbi Designer v\u00e0 Backend Developer \u0111\u1ec3 t\u1ea1o ra UI c\u1ee7a m\u1ed9t trang web.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c <a href=\"https:\/\/itviec.com\/blog\/front-end-developer-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>l\u1eadp tr\u00ecnh vi\u00ean Frontend<\/strong><\/a> s\u1eed d\u1ee5ng c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh v\u00e0 framework \u0111\u1ec3 t\u1ea1o ra nh\u1eefng g\u00ec ng\u01b0\u1eddi d\u00f9ng tr\u1ea3i nghi\u1ec7m trong tr\u00ecnh duy\u1ec7t, \u0111\u1ea3m b\u1ea3o tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng tuy\u1ec7t v\u1eddi.<\/span><\/p>\n<p>Tr\u01b0\u1edbc khi \u0111i chi ti\u1ebft v\u00e0o danh s\u00e1ch c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end ph\u1ed5 bi\u1ebfn nh\u1ea5t, b\u1ea1n c\u00f3 th\u1ec3 &#8220;\u00f4n t\u1eadp&#8221; v\u1edbi c\u00e1c b\u00e0i vi\u1ebft sau \u0111\u00e2y:<\/p>\n<ul>\n<li><a href=\"https:\/\/itviec.com\/blog\/front-end-la-gi\/\" target=\"_blank\" rel=\"noopener\">Front end l\u00e0 g\u00ec? H\u01b0\u1edbng ti\u1ebfp c\u1eadn cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u<\/a><\/li>\n<li><a href=\"https:\/\/itviec.com\/blog\/tai-lieu-front-end\/\" target=\"_blank\" rel=\"noopener\">T\u00e0i li\u1ec7u d\u00e0nh cho Front end Developer t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao<\/a><\/li>\n<li><a href=\"https:\/\/itviec.com\/blog\/front-end-framework-library\/\" target=\"_blank\" rel=\"noopener\">Top 10 Th\u01b0 vi\u1ec7n v\u00e0 Framework front end d\u00f9ng nhi\u1ec1u nh\u1ea5t 2024<\/a><\/li>\n<li><a href=\"https:\/\/itviec.com\/blog\/lo-trinh-hoc-front-end\/\" target=\"_blank\" rel=\"noopener\">L\u1ed9 tr\u00ecnh h\u1ecdc Front End to\u00e0n di\u1ec7n A-Z ch\u1ec9 trong v\u00f2ng 10-12 th\u00e1ng<\/a><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Front_end_ve_HTML_va_CSS\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 HTML v\u00e0 CSS<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Th\u1ebb meta trong HTML l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Th\u1ebb &lt;meta&gt; l\u00e0 nh\u1eefng d\u00f2ng m\u00e3 nh\u1ecf \u0111\u01b0\u1ee3c \u0111\u1eb7t trong ph\u1ea7n &lt;head&gt; c\u1ee7a m\u1ed9t trang HTML.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u00fang \u0111\u00f3ng vai tr\u00f2 nh\u01b0 nh\u1eefng &#8220;d\u1ea5u hi\u1ec7u&#8221; cung c\u1ea5p th\u00f4ng tin v\u1ec1 trang web cho c\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm (Google, Bing) v\u00e0 tr\u00ecnh duy\u1ec7t. Nh\u1edd \u0111\u00f3, c\u00e1c c\u00f4ng c\u1ee5 n\u00e0y c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 n\u1ed9i dung c\u1ee7a trang, t\u1eeb \u0111\u00f3 x\u1ebfp h\u1ea1ng trang web t\u1ed1t h\u01a1n trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm v\u00e0 hi\u1ec3n th\u1ecb trang m\u1ed9t c\u00e1ch ph\u00f9 h\u1ee3p tr\u00ean c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c nhau.<\/span><\/p>\n<h3><b>C\u00e1c th\u00e0nh ph\u1ea7n ng\u1eef ngh\u0129a trong HTML l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c ph\u1ea7n t\u1eed ng\u1eef ngh\u0129a trong HTML l\u00e0 c\u00e1c ph\u1ea7n t\u1eed ch\u1ee9a \u00fd ngh\u0129a c\u1ee7a n\u1ed9i dung v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a t\u00e0i li\u1ec7u HTML. Nh\u1eefng ph\u1ea7n t\u1eed n\u00e0y ch\u1ee9a n\u1ed9i dung c\u00f3 li\u00ean quan \u0111\u1ebfn t\u00ean c\u1ee7a ch\u00fang ho\u1eb7c ph\u1ea3n \u00e1nh t\u00ean c\u1ee7a ch\u00fang.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: Nh\u1eefng th\u1ebb b\u1ed1 c\u1ee5c trang nh\u01b0 Header (\u0110\u1ea7u trang), Main (N\u1ed9i dung ch\u00ednh), Section (Ph\u1ea7n), Article (B\u00e0i vi\u1ebft), Aside (B\u00ean l\u1ec1), Footer (Ch\u00e2n trang),&#8230; ngo\u00e0i ra c\u00f2n nh\u1eefng th\u1ebb cho n\u1ed9i dung trang nh\u01b0 figure (h\u00ecnh \u1ea3nh, bi\u1ec3u \u0111\u1ed3), time (th\u1eddi gian), details (th\u1ebb chi ti\u1ebft c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng n\u1ed9i dung), summary (t\u00f3m t\u1eaft cho n\u1ed9i dung),&#8230;<\/span><\/p>\n<h3><b>B\u1ea1n hi\u1ec3u nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 c\u00e1c thu\u1ed9c t\u00ednh id v\u00e0 class trong HTML?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1ed9t id l\u00e0 m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t, ngh\u0129a l\u00e0 trong m\u1ed9t trang HTML, m\u1ed7i id ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t l\u1ea7n. Trong khi \u0111\u00f3, m\u1ed9t class l\u00e0 m\u1ed9t \u0111\u1ecbnh danh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho nhi\u1ec1u ph\u1ea7n t\u1eed. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n c\u00f3 th\u1ec3 g\u00e1n c\u00f9ng m\u1ed9t class cho nhi\u1ec1u ph\u1ea7n t\u1eed kh\u00e1c nhau.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Th\u00f4ng th\u01b0\u1eddng, m\u1ed9t id s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n \u0111\u1ecbnh \u0111\u1ecba ch\u1ec9 m\u1ed9t ph\u1ea7n t\u1eed duy nh\u1ea5t th\u00f4ng qua CSS ho\u1eb7c JavaScript. Ng\u01b0\u1ee3c l\u1ea1i, b\u1ea1n s\u1ebd mu\u1ed1n s\u1eed d\u1ee5ng m\u1ed9t class khi c\u1ea7n \u0111\u1ecbnh \u0111\u1ecba ch\u1ec9 m\u1ed9t nh\u00f3m c\u00e1c ph\u1ea7n t\u1eed DOM.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;h1 id=\"heading1\"&gt;\u0110\u00e2y l\u00e0 ti\u00eau \u0111\u1ec1 ch\u00ednh&lt;\/h1&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;p class=\"paragraph\"&gt;\u0110\u00e2y l\u00e0 m\u1ed9t \u0111o\u1ea1n v\u0103n b\u1ea3n.&lt;\/p&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;p class=\"paragraph\"&gt;\u0110\u00e2y l\u00e0 m\u1ed9t \u0111o\u1ea1n v\u0103n b\u1ea3n kh\u00e1c c\u00f9ng class.&lt;\/p&gt;<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Trong v\u00ed d\u1ee5 tr\u00ean:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u1ea7n t\u1eed &lt;h1&gt; c\u00f3 id l\u00e0 &#8220;heading1&#8221; v\u00e0 s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecbnh d\u1ea1ng ri\u00eang bi\u1ec7t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u1ea3 hai ph\u1ea7n t\u1eed &lt;p&gt; \u0111\u1ec1u c\u00f3 class l\u00e0 &#8220;paragraph&#8221; v\u00e0 s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecbnh d\u1ea1ng gi\u1ed1ng nhau.<\/span><\/li>\n<\/ul>\n<h3><b>Ph\u00e2n bi\u1ec7t gi\u1eefa div v\u00e0 span?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Th\u1ebb div v\u00e0 span l\u00e0 hai th\u1ebb th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 nh\u00f3m c\u00e1c ph\u1ea7n t\u1eed HTML l\u1ea1i v\u1edbi nhau, tuy nhi\u00ean ch\u00fang c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng kh\u00e1c nhau.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>DIV<\/b><\/td>\n<td><b>SPAN<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00e1ch c\u00e1c ph\u1ea7n t\u1eed l\u00e0 block-line, ng\u1eaft d\u00f2ng tr\u01b0\u1edbc v\u00e0 sau n\u00f3.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 nh\u00f3m c\u00e1c ph\u1ea7n t\u1eed n\u1ed9i tuy\u1ebfn trong t\u00e0i li\u1ec7u HTML.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh chung cho c\u00e1c ph\u1ea7n t\u1eed c\u1ee5 th\u1ec3 trong t\u00e0i li\u1ec7u HTML.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Bao g\u1ed3m c\u00e1c thu\u1ed9c t\u00ednh nh\u1ea5t \u0111\u1ecbnh, to\u00e0n c\u1ee5c v\u00e0 s\u1ef1 ki\u1ec7n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u00f4i khi th\u1ebb para &lt;P&gt; \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ph\u1ea7n b\u00ean trong c\u1ee7a th\u1ebb &lt;div&gt;.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u1ebb &lt;span&gt; \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1eed d\u1ee5ng ki\u1ec3u CSS cho m\u1ed9t s\u1ed1 t\u1eeb nh\u1ea5t \u0111\u1ecbnh v\u1edbi b\u1ed9 ph\u00f4ng ch\u1eef \u0111\u00e3 ch\u1ecdn.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Trong th\u1ebb div, ch\u00fang ta s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng vi\u1ec1n c\u00f3 chi\u1ec1u r\u1ed9ng chi\u1ec1u cao v\u1edbi c\u00e1c pixel m\u00e0u \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh \u0111\u1ec3 l\u00e0m n\u1ed5i b\u1eadt ph\u1ea7n giao di\u1ec7n c\u1ee7a t\u00e0i li\u1ec7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Trong th\u1ebb span, ch\u00fang ta s\u1eed d\u1ee5ng m\u00e3 m\u00e0u \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh \u0111\u1ec3 m\u00f4 t\u1ea3 t\u00e0i li\u1ec7u giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/the-div-trong-html\/\" target=\"_blank\" rel=\"noopener\"><strong>Th\u1ebb div trong HTML: \u0110\u1ecbnh ngh\u0129a v\u00e0 T\u1ed5ng h\u1ee3p c\u00e1ch s\u1eed d\u1ee5ng<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>Doctype c\u00f3 ch\u1ee9c n\u0103ng g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Khai b\u00e1o ki\u1ec3u t\u00e0i li\u1ec7u HTML hay c\u00f2n g\u1ecdi l\u00e0 DOCTYPE (Document Type Declaration) l\u00e0 d\u00f2ng m\u00e3 \u0111\u1ea7u ti\u00ean b\u1eaft bu\u1ed9c trong m\u1ed7i t\u00e0i li\u1ec7u HTML ho\u1eb7c XHTML.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Khai b\u00e1o DOCTYPE h\u01b0\u1edbng d\u1eabn tr\u00ecnh duy\u1ec7t v\u1ec1 phi\u00ean b\u1ea3n HTML m\u00e0 trang \u0111ang s\u1eed d\u1ee5ng, gi\u00fap \u0111\u1ea3m b\u1ea3o trang web \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch v\u00e0 hi\u1ec3n th\u1ecb nh\u1ea5t qu\u00e1n tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t kh\u00e1c nhau.<\/span><\/p>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1ebb (tags) v\u00e0 thu\u1ed9c t\u00ednh (attributes) trong HTML l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c th\u1ebb (tags) x\u00e1c \u0111\u1ecbnh c\u00e1c ph\u1ea7n t\u1eed tr\u00ean trang v\u00e0 bao quanh n\u1ed9i dung b\u00ean trong (n\u1ebfu c\u00f3), th\u01b0\u1eddng bao g\u1ed3m th\u1ebb m\u1edf v\u00e0 th\u1ebb \u0111\u00f3ng. C\u00f3 m\u1ed9t s\u1ed1 th\u1ebb t\u1ef1 \u0111\u00f3ng v\u00ed d\u1ee5 nh\u01b0 &lt;img \/&gt;. Thu\u1ed9c t\u00ednh (attributes) l\u00e0 c\u1eb7p gi\u00e1 tr\u1ecb \u0111i k\u00e8m v\u1edbi c\u00e1c th\u1ebb v\u00e0 \u0111\u01b0\u1ee3c khai b\u00e1o trong th\u1ebb m\u1edf. C\u00e1c thu\u1ed9c t\u00ednh ph\u1ed5 bi\u1ebfn bao g\u1ed3m id (ph\u1ea3i l\u00e0 duy nh\u1ea5t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t ph\u1ea7n t\u1eed tr\u00ean trang), class v\u00e0 style.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5:<\/span><\/p>\n<pre><i><span style=\"font-weight: 400;\">&lt;p style=\u201ccolor:blue;\u201d&gt;\u0110\u00e2y l\u00e0 m\u1ed9t \u0111o\u1ea1n v\u0103n&lt;\/p&gt;.<\/span><\/i><\/pre>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3, \u201cp\u201d l\u00e0 th\u1ebb, c\u00f2n \u201cstyle\u201d l\u00e0 thu\u1ed9c t\u00ednh.<\/span><\/p>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/cac-the-trong-html\/\" target=\"_blank\" rel=\"noopener\"><strong>T\u1ed5ng h\u1ee3p 70+ c\u00e1c th\u1ebb trong HTML th\u00f4ng d\u1ee5ng<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>&#8220;Box model&#8221; CSS l\u00e0 g\u00ec v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n b\u1ed1 c\u1ee5c t\u1ea1o n\u00ean n\u00f3?<\/b><\/h3>\n<p><strong>CSS <\/strong><b>box model<\/b><span style=\"font-weight: 400;\"> l\u00e0 kh\u00e1i ni\u1ec7m m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac h\u00ecnh ch\u1eef nh\u1eadt c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed trong DOM, \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh b\u1ed1 c\u1ee5c c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed tr\u00ean trang web. M\u00f4 h\u00ecnh n\u00e0y bao g\u1ed3m c\u00e1c l\u1edbp sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Content<\/b><span style=\"font-weight: 400;\">: Ph\u1ea7n b\u00ean trong c\u00f9ng, n\u01a1i ch\u1ee9a n\u1ed9i dung nh\u01b0 v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Padding<\/b><span style=\"font-weight: 400;\">: Kho\u1ea3ng tr\u1ed1ng gi\u1eefa n\u1ed9i dung v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Border<\/b><span style=\"font-weight: 400;\">: \u0110\u01b0\u1eddng vi\u1ec1n bao quanh ph\u1ea7n padding c\u1ee7a ph\u1ea7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Margin<\/b><span style=\"font-weight: 400;\">: Kho\u1ea3ng c\u00e1ch b\u00ean ngo\u00e0i \u0111\u01b0\u1eddng vi\u1ec1n, t\u00e1ch ph\u1ea7n t\u1eed ra kh\u1ecfi c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/w0.codingame.com\/work\/wp-content\/uploads\/2022\/06\/css.png\"><i><span style=\"font-weight: 400;\">\u1ea2nh minh ho\u1ea1<\/span><\/i><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c ki\u1ec3m so\u00e1t t\u1eebng l\u1edbp n\u00e0y m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp gi\u00fap b\u1ea1n t\u00f9y ch\u1ec9nh giao di\u1ec7n v\u00e0 kho\u1ea3ng c\u00e1ch c\u1ee7a t\u1eebng ph\u1ea7n t\u1eed trong giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng. Box model CSS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh h\u00ecnh b\u1ed1 c\u1ee5c trang b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh c\u00e1c thu\u1ed9c t\u00ednh bao quanh n\u1ed9i dung c\u1ee7a ph\u1ea7n t\u1eed, bao g\u1ed3m c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a <\/span><b>margin<\/b><span style=\"font-weight: 400;\">, <\/span><b>border<\/b><span style=\"font-weight: 400;\">, v\u00e0 <\/span><b>padding<\/b><span style=\"font-weight: 400;\"> \u1edf c\u00e1c ph\u00eda.<\/span><\/p>\n<h3><b>B\u1ed9 ch\u1ecdn CSS c\u1ee5 th\u1ec3 l\u00e0 g\u00ec v\u00e0 n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CSS cung c\u1ea5p nhi\u1ec1u b\u1ed9 ch\u1ecdn (selector) kh\u00e1c nhau \u0111\u1ec3 ch\u1ecdn c\u00e1c ph\u1ea7n t\u1eed HTML v\u00e0 t\u1ea1o ki\u1ec3u cho ch\u00fang theo y\u00eau c\u1ea7u. C\u00e1c b\u1ed9 ch\u1ecdn CSS bao g\u1ed3m b\u1ed9 ch\u1ecdn ph\u1ea7n t\u1eed (element selector), b\u1ed9 ch\u1ecdn l\u1edbp (class selector) v\u00e0 b\u1ed9 ch\u1ecdn ID (ID selector).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1eebng b\u1ed9 ch\u1ecdn CSS nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn ph\u1ea7n t\u1eed (Element selector)<\/b><span style=\"font-weight: 400;\">: Ch\u1ecdn tr\u1ef1c ti\u1ebfp b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng t\u00ean c\u1ee7a ph\u1ea7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn ID (ID selector)<\/b><span style=\"font-weight: 400;\">: \u0110\u1ecbnh ngh\u0129a thu\u1ed9c t\u00ednh ID v\u00e0 ch\u1ecdn b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u # tr\u01b0\u1edbc gi\u00e1 tr\u1ecb c\u1ee7a thu\u1ed9c t\u00ednh ID.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn l\u1edbp (Class selector)<\/b><span style=\"font-weight: 400;\">: \u0110\u1ecbnh ngh\u0129a thu\u1ed9c t\u00ednh l\u1edbp v\u00e0 ch\u1ecdn b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u . tr\u01b0\u1edbc gi\u00e1 tr\u1ecb c\u1ee7a thu\u1ed9c t\u00ednh l\u1edbp.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn to\u00e0n c\u1ea7u (Universal Selector):<\/b><span style=\"font-weight: 400;\"> Ch\u1ecdn b\u1eb1ng k\u00fd hi\u1ec7u *.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn thu\u1ed9c t\u00ednh (Attribute Selector)<\/b><span style=\"font-weight: 400;\">: Ch\u1ecdn c\u00e1c ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb c\u1ee7a thu\u1ed9c t\u00ednh. V\u00ed d\u1ee5: input[type=\u201dtext\u201d]{}.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn con tr\u1ef1c ti\u1ebfp (Direct Child Selector)<\/b><span style=\"font-weight: 400;\">: Ch\u1ecdn ph\u1ea7n t\u1eed b\u1eb1ng b\u1ea5t k\u1ef3 b\u1ed9 ch\u1ecdn n\u00e0o tr\u00ean \u0111\u00e2y v\u00e0 s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u &gt; \u0111\u1ec3 ch\u1ecdn con tr\u1ef1c ti\u1ebfp. V\u00ed d\u1ee5: parent &gt; child{}.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 ch\u1ecdn gi\u1ea3 (Pseudo Selectors)<\/b><span style=\"font-weight: 400;\">: C\u00e1c b\u1ed9 ch\u1ecdn nh\u01b0 :hover, :nth-child(), ::after, ::before,&#8230;<\/span><\/li>\n<\/ul>\n<h3><b>S\u1ef1 kh\u00e1c nhau gi\u1eefa margin v\u00e0 padding l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa padding v\u00e0 margin l\u00e0 margin \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kho\u1ea3ng c\u00e1ch xung quanh m\u1ed9t ph\u1ea7n t\u1eed, trong khi padding ki\u1ec3m so\u00e1t kho\u1ea3ng c\u00e1ch b\u00ean trong ph\u1ea7n t\u1eed. Nh\u01b0 v\u1eady, n\u1ebfu mu\u1ed1n thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a m\u1ed9t ph\u1ea7n t\u1eed so v\u1edbi b\u1ed1 c\u1ee5c trang ho\u1eb7c thi\u1ebft l\u1eadp kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c ph\u1ea7n t\u1eed li\u1ec1n k\u1ec1, b\u1ea1n n\u00ean s\u1eed d\u1ee5ng margin. Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu mu\u1ed1n thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a n\u1ed9i dung b\u00ean trong \u0111\u01b0\u1eddng vi\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed, b\u1ea1n n\u00ean thi\u1ebft l\u1eadp padding.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u1ea3ng b\u00ean d\u01b0\u1edbi c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n h\u00ecnh dung r\u00f5 r\u00e0ng h\u01a1n s\u1ef1 kh\u00e1c nhau gi\u1eefa Margin v\u00e0 Padding.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Margin<\/b><\/td>\n<td><b>Padding<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">L\u00e0 kho\u1ea3ng c\u00e1ch b\u00ean ngo\u00e0i c\u1ee7a m\u1ed9t ph\u1ea7n t\u1eed tr\u00ean trang.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">X\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch xung quanh n\u1ed9i dung b\u00ean trong m\u1ed9t ph\u1ea7n t\u1eed web.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ki\u1ec3m so\u00e1t kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c ph\u1ea7n t\u1eed ri\u00eang bi\u1ec7t tr\u00ean trang.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thi\u1ebft l\u1eadp kho\u1ea3ng c\u00e1ch gi\u1eefa n\u1ed9i dung v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed ch\u1ee9a n\u00f3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u1eb7t margin th\u00e0nh auto, \u00e1p d\u1ee5ng cho t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3 thi\u1ebft l\u1eadp t\u1ef1 \u0111\u1ed9ng cho c\u00e1c thu\u1ed9c t\u00ednh padding trong CSS.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb \u00e2m \u0111\u1ec3 ch\u1ed3ng l\u1ea5n c\u00e1c ph\u1ea7n t\u1eed.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb \u00e2m.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi ki\u1ec3u d\u00e1ng c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 k\u1ebf th\u1eeba ki\u1ec3u d\u00e1ng c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c ph\u1ea7n t\u1eed li\u1ec1n k\u1ec1.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>B\u1ed9 ti\u1ec1n x\u1eed l\u00fd CSS l\u00e0 g\u00ec? B\u1ea1n c\u00f3 th\u1ec3 k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 b\u1ed9 ti\u1ec1n x\u1eed l\u00fd ph\u1ed5 bi\u1ebfn kh\u00f4ng?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">B\u1ed9 ti\u1ec1n x\u1eed l\u00fd CSS (CSS Preprocessor) l\u00e0 c\u00f4ng c\u1ee5 cho ph\u00e9p vi\u1ebft code CSS v\u1edbi c\u00fa ph\u00e1p m\u1edf r\u1ed9ng v\u00e0 c\u00e1c t\u00ednh n\u0103ng b\u1ed5 sung m\u00e0 CSS th\u00f4ng th\u01b0\u1eddng kh\u00f4ng c\u00f3 nh\u01b0 bi\u1ebfn, v\u00f2ng l\u1eb7p, h\u00e0m, k\u1ebf th\u1eeba v\u00e0 c\u00e1c to\u00e1n t\u1eed. Sau \u0111\u00f3, code n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c bi\u00ean d\u1ecbch th\u00e0nh CSS thu\u1ea7n \u0111\u1ec3 tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed7i b\u1ed9 ti\u1ec1n x\u1eed l\u00fd c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m ri\u00eang ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c nhu c\u1ea7u kh\u00e1c nhau trong l\u1eadp tr\u00ecnh web. M\u1ed9t s\u1ed1 b\u1ed9 ti\u1ec1n x\u1eed l\u00fd CSS ph\u1ed5 bi\u1ebfn g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>SASS\/SCSS<\/b><span style=\"font-weight: 400;\">: H\u1ed7 tr\u1ee3 c\u00fa ph\u00e1p gi\u1ed1ng CSS ti\u00eau chu\u1ea9n (SCSS) v\u00e0 c\u00fa ph\u00e1p d\u1ef1a tr\u00ean th\u1ee5t l\u1ec1 (SASS).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>LESS<\/b><span style=\"font-weight: 400;\">: C\u00f3 c\u00fa ph\u00e1p kh\u00e1 gi\u1ed1ng v\u1edbi CSS, t\u00edch h\u1ee3p t\u1ed1t v\u1edbi JavaScript.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Stylus<\/b><span style=\"font-weight: 400;\">: Cung c\u1ea5p c\u00fa ph\u00e1p linh ho\u1ea1t v\u00e0 ng\u1eafn g\u1ecdn, cho ph\u00e9p b\u1ecf qua d\u1ea5u ngo\u1eb7c v\u00e0 d\u1ea5u ch\u1ea5m ph\u1ea9y.<\/span><\/li>\n<\/ul>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c ph\u1ea7n t\u1eed inline, inline-block v\u00e0 block l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong CSS, s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c ph\u1ea7n t\u1eed inline, inline-block v\u00e0 block n\u1eb1m \u1edf c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean trang web:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Inline<\/b><span style=\"font-weight: 400;\">: C\u00e1c ph\u1ea7n t\u1eed inline kh\u00f4ng c\u00f3 chi\u1ec1u r\u1ed9ng ho\u1eb7c chi\u1ec1u cao c\u1ee5 th\u1ec3. Ch\u00fang kh\u00f4ng b\u1eaft \u0111\u1ea7u tr\u00ean m\u1ed9t d\u00f2ng m\u1edbi v\u00e0 ch\u1ec9 chi\u1ebfm kh\u00f4ng gian c\u1ea7n thi\u1ebft d\u1ef1a tr\u00ean n\u1ed9i dung c\u1ee7a ch\u00fang. V\u00ed d\u1ee5: &lt;span&gt;, &lt;a&gt;.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Inline-block<\/b><span style=\"font-weight: 400;\">: T\u01b0\u01a1ng t\u1ef1 nh\u01b0 ph\u1ea7n t\u1eed inline, c\u00e1c ph\u1ea7n t\u1eed DOM n\u00e0y kh\u00f4ng b\u1eaft \u0111\u1ea7u tr\u00ean m\u1ed9t d\u00f2ng m\u1edbi, tuy nhi\u00ean, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t chi\u1ec1u r\u1ed9ng v\u00e0 chi\u1ec1u cao cho ch\u00fang. V\u00ed d\u1ee5: &lt;img&gt;.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Block<\/b><span style=\"font-weight: 400;\">: C\u00e1c ph\u1ea7n t\u1eed block b\u1eaft \u0111\u1ea7u tr\u00ean m\u1ed9t d\u00f2ng m\u1edbi, m\u1eb7c \u0111\u1ecbnh chi\u1ebfm to\u00e0n b\u1ed9 chi\u1ec1u r\u1ed9ng c\u00f3 s\u1eb5n. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t chi\u1ec1u r\u1ed9ng v\u00e0 chi\u1ec1u cao cho ch\u00fang. V\u00ed d\u1ee5: &lt;div&gt;, &lt;p&gt;.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Front_end_ve_JavaScript\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 JavaScript<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>JavaScript l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">JavaScript l\u00e0 ng\u00f4n ng\u1eef k\u1ecbch b\u1ea3n c\u1ea5p cao v\u00e0 c\u00f3 ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ed9ng. Ng\u00f4n ng\u1eef n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u00eam c\u00e1c th\u00e0nh ph\u1ea7n v\u00e0 hi\u1ec7u \u1ee9ng \u0111\u1ed9ng v\u00e0o t\u00e0i li\u1ec7u HTML, gi\u00fap trang web tr\u1edf n\u00ean t\u01b0\u01a1ng t\u00e1c v\u00e0 thu h\u00fat h\u01a1n.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng \u1edf c\u1ea3 ph\u00eda giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng (frontend) v\u00e0 ph\u00eda m\u00e1y ch\u1ee7 (backend). Hi\u1ec7n nay c\u00f3 r\u1ea5t nhi\u1ec1u framework v\u00e0 th\u01b0 vi\u1ec7n JavaScript ph\u1ed5 bi\u1ebfn h\u1ed7 tr\u1ee3 l\u1eadp tr\u00ecnh Frontend, ch\u1eb3ng h\u1ea1n ReactJS, Vue.js, AngularJS, Next.js,&#8230; Trong \u0111\u00f3, Node.js l\u00e0 framework JavaScript n\u1ed5i b\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ph\u00e1t tri\u1ec3n backend.<\/span><\/p>\n<h3><b>C\u00f3 bao nhi\u00eau ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">JavaScript c\u00f3 t\u00e1m ki\u1ec3u d\u1eef li\u1ec7u ch\u00ednh, \u0111\u01b0\u1ee3c chia th\u00e0nh hai lo\u1ea1i: ki\u1ec3u d\u1eef li\u1ec7u nguy\u00ean th\u1ee7y (primitive) v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u tham chi\u1ebfu (reference).<\/span><\/p>\n<p><b>Trong JavaScript, c\u00f3 8 ki\u1ec3u d\u1eef li\u1ec7u ch\u00ednh:<\/b><span style=\"font-weight: 400;\"> String, Number, Boolean, Undefined, Null, Symbol, BigInt, Object.\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>String<\/b><span style=\"font-weight: 400;\">: D\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n chu\u1ed7i v\u0103n b\u1ea3n. V\u00ed d\u1ee5: &#8220;Hello, World!&#8221;.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Number<\/b><span style=\"font-weight: 400;\">: D\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c s\u1ed1, bao g\u1ed3m c\u1ea3 s\u1ed1 nguy\u00ean v\u00e0 s\u1ed1 th\u1ef1c. V\u00ed d\u1ee5: 42, 3.14.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Boolean<\/b><span style=\"font-weight: 400;\">: Ch\u1ec9 c\u00f3 hai gi\u00e1 tr\u1ecb l\u00e0 true v\u00e0 false, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c bi\u1ec3u th\u1ee9c \u0111i\u1ec1u ki\u1ec7n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Undefined<\/b><span style=\"font-weight: 400;\">: M\u1ed9t bi\u1ebfn ch\u01b0a \u0111\u01b0\u1ee3c g\u00e1n gi\u00e1 tr\u1ecb s\u1ebd c\u00f3 ki\u1ec3u d\u1eef li\u1ec7u l\u00e0 undefined.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Null<\/b><span style=\"font-weight: 400;\">: Bi\u1ec3u th\u1ecb cho m\u1ed9t gi\u00e1 tr\u1ecb &#8220;tr\u1ed1ng&#8221; ho\u1eb7c &#8220;kh\u00f4ng t\u1ed3n t\u1ea1i&#8221;. Ki\u1ec3u d\u1eef li\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng t\u1eeb kh\u00f3a null.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Symbol<\/b><span style=\"font-weight: 400;\">: M\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1eb7c bi\u1ec7t d\u00f9ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c gi\u00e1 tr\u1ecb duy nh\u1ea5t kh\u00f4ng th\u1ec3 thay th\u1ebf, \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u trong ECMAScript 6.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>BigInt<\/b><span style=\"font-weight: 400;\">: D\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c s\u1ed1 nguy\u00ean r\u1ea5t l\u1edbn, l\u1edbn h\u01a1n gi\u1edbi h\u1ea1n c\u1ee7a ki\u1ec3u Number. \u0110\u01b0\u1ee3c gi\u1edbi thi\u1ec7u trong ECMAScript 2020.<\/span><\/li>\n<li><b>Object:<\/b><span style=\"font-weight: 400;\"> \u0110\u00e2y l\u00e0 ki\u1ec3u d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, cho ph\u00e9p l\u01b0u tr\u1eef nhi\u1ec1u gi\u00e1 tr\u1ecb v\u00e0 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau d\u01b0\u1edbi d\u1ea1ng c\u1eb7p kh\u00f3a-gi\u00e1 tr\u1ecb. V\u00ed d\u1ee5: { name: &#8220;Alice&#8221;, age: 30 }.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, JavaScript c\u0169ng h\u1ed7 tr\u1ee3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u ph\u1ee9c h\u1ee3p nh\u01b0 m\u1ea3ng (Array), h\u00e0m (Function), Date, RegExp,&#8230;<\/span><\/p>\n<h3><b>C\u00f3 nh\u1eefng c\u00e1ch n\u00e0o \u0111\u1ec3 t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau. Sau \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e1ch th\u01b0\u1eddng g\u1eb7p nh\u1ea5t:<\/span><\/p>\n<h4><b>S\u1eed d\u1ee5ng C\u00fa ph\u00e1p \u0110\u1ed1i t\u01b0\u1ee3ng (Object Literal)<\/b><\/h4>\n<pre><span style=\"font-weight: 400;\">let obj = {}<\/span><\/pre>\n<h4><b>S\u1eed d\u1ee5ng H\u00e0m Kh\u1edfi t\u1ea1o (Construction Function)<\/b><\/h4>\n<pre><span style=\"font-weight: 400;\">function Student(name, class) {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0this.name = name;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0this.class = class;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span>\r\n\r\n<span style=\"font-weight: 400;\">let obj = new Student(\"Neha\", 8);<\/span><\/pre>\n<h4><b>S\u1eed d\u1ee5ng Ph\u01b0\u01a1ng th\u1ee9c Object.create()<\/b><\/h4>\n<pre><span style=\"font-weight: 400;\">const obj = Object.create(prototype);<\/span><\/pre>\n<h4><b>S\u1eed d\u1ee5ng L\u1edbp (Class)<\/b><\/h4>\n<pre><span style=\"font-weight: 400;\">class Student {\u00a0\u00a0\u00a0\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0constructor(name, class) {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.name = name;\u00a0\u00a0\u00a0\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.class = class;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0}<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span>\r\n\r\n<span style=\"font-weight: 400;\">let obj = new Student(\"Neha\", 8);<\/span><\/pre>\n<h4><b>S\u1eed d\u1ee5ng H\u00e0m Kh\u1edfi t\u1ea1o Object<\/b><\/h4>\n<pre><span style=\"font-weight: 400;\">let obj = new Object();<\/span>\r\n\r\n<span style=\"font-weight: 400;\">obj.name = \"Neha\";<\/span><\/pre>\n<h3><b>S\u1ef1 kh\u00e1c nhau gi\u1eefa == v\u00e0 === trong JavaScript l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">To\u00e1n t\u1eed == \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 to\u00e1n t\u1eed so s\u00e1nh b\u1eb1ng hai trong JavaScript, trong khi === l\u00e0 to\u00e1n t\u1eed so s\u00e1nh b\u1eb1ng ba.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u1ea3 hai to\u00e1n t\u1eed n\u00e0y \u0111\u1ec1u l\u00e0 c\u00e1c to\u00e1n t\u1eed so s\u00e1nh v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 so s\u00e1nh gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c to\u00e1n h\u1ea1ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tuy nhi\u00ean, to\u00e1n t\u1eed == ch\u1ec9 ki\u1ec3m tra gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c to\u00e1n h\u1ea1ng v\u00e0 tr\u1ea3 v\u1ec1 true n\u1ebfu c\u00e1c gi\u00e1 tr\u1ecb gi\u1ed1ng nhau. Ng\u01b0\u1ee3c l\u1ea1i, to\u00e1n t\u1eed === kh\u00f4ng ch\u1ec9 ki\u1ec3m tra gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c to\u00e1n h\u1ea1ng m\u00e0 c\u00f2n ki\u1ec3m tra ki\u1ec3u d\u1eef li\u1ec7u c\u1ee7a ch\u00fang. N\u00f3 ch\u1ec9 tr\u1ea3 v\u1ec1 true n\u1ebfu c\u1ea3 gi\u00e1 tr\u1ecb v\u00e0 ki\u1ec3u c\u1ee7a c\u00e1c to\u00e1n h\u1ea1ng gi\u1ed1ng nhau.<\/span><\/p>\n<h3><b>B\u1ea1n hi\u1ec3u nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 bi\u1ebfn trong JavaScript? S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa var, let, v\u00e0 const l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong JavaScript, bi\u1ebfn l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m cho ph\u00e9p l\u1eadp tr\u00ecnh vi\u00ean l\u01b0u tr\u1eef d\u1eef li\u1ec7u m\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp v\u00e0 thay \u0111\u1ed5i trong su\u1ed1t ch\u01b0\u01a1ng tr\u00ecnh. C\u00f3 ba c\u00e1ch ch\u00ednh \u0111\u1ec3 khai b\u00e1o bi\u1ebfn l\u00e0 var, let v\u00e0 const.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ki\u1ec3u bi\u1ebfn<\/b><\/td>\n<td><b>Ph\u1ea1m vi<\/b><\/td>\n<td><b>Hoisting<\/b><\/td>\n<td><b>C\u1eadp nh\u1eadt<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>var<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ea1m vi to\u00e0n c\u1ee5c ho\u1eb7c ph\u1ea1m vi h\u00e0m.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; N\u1ebfu bi\u1ebfn \u0111\u01b0\u1ee3c khai b\u00e1o b\u00ean ngo\u00e0i m\u1ed9t h\u00e0m, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u trong ch\u01b0\u01a1ng tr\u00ecnh.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; N\u1ebfu \u0111\u01b0\u1ee3c khai b\u00e1o trong m\u1ed9t h\u00e0m, n\u00f3 ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp trong h\u00e0m \u0111\u00f3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c hoisted l\u00ean \u0111\u1ea7u ph\u1ea1m vi c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng bi\u1ebfn tr\u01b0\u1edbc khi khai b\u00e1o m\u00e0 kh\u00f4ng g\u1eb7p l\u1ed7i.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn var c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i sau khi \u0111\u00e3 khai b\u00e1o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>let<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ea1m vi kh\u1ed1i (block scope).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 bi\u1ebfn khai b\u00e1o b\u1eb1ng let ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp trong kh\u1ed1i code (v\u00ed d\u1ee5: trong {}) n\u01a1i n\u00f3 \u0111\u01b0\u1ee3c khai b\u00e1o.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ecb hoisted, nh\u01b0ng kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng tr\u01b0\u1edbc khi khai b\u00e1o (g\u1ecdi l\u00e0 &#8220;temporal dead zone&#8221;).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn let c\u00f3 th\u1ec3 thay \u0111\u1ed5i sau khi khai b\u00e1o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>const<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ea1m vi kh\u1ed1i (block scope).\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ecb hoisted, nh\u01b0ng kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng tr\u01b0\u1edbc khi khai b\u00e1o.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 khai b\u00e1o c\u00e1c bi\u1ebfn kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i (constant).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tuy nhi\u00ean, n\u1ebfu gi\u00e1 tr\u1ecb l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c m\u1ea3ng, b\u1ea1n v\u1eabn c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c ph\u1ea7n t\u1eed b\u00ean trong \u0111\u1ed1i t\u01b0\u1ee3ng\/m\u1ea3ng \u0111\u00f3.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Virtual DOM ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o v\u00e0 \u01b0u \u0111i\u1ec3m c\u1ee7a n\u00f3 l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><b>M\u00f4 h\u00ecnh DOM &#8211; Document Object Model<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t API cho c\u00e1c t\u00e0i li\u1ec7u web. N\u00f3 \u0111\u1ea1i di\u1ec7n cho c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t trang web HTML d\u01b0\u1edbi d\u1ea1ng m\u1ed9t c\u00e2y c\u00e1c n\u00fat, trong \u0111\u00f3 m\u1ed7i n\u00fat t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t ph\u1ea7n c\u1ee7a t\u00e0i li\u1ec7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1ch m\u00e0 virtual DOM ho\u1ea1t \u0111\u1ed9ng nh\u01b0 sau: <\/span><a href=\"https:\/\/assets.roadmap.sh\/guest\/virtual-dom-example-7ynkg.png\"><i><span style=\"font-weight: 400;\">H\u00ecnh \u1ea3nh minh h\u1ecda<\/span><\/i><\/a><\/p>\n<p><span style=\"font-weight: 400;\">To\u00e0n b\u1ed9 giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng (UI) \u0111\u01b0\u1ee3c sao ch\u00e9p v\u00e0o m\u1ed9t c\u1ea5u tr\u00fac trong b\u1ed9 nh\u1edb \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 &#8220;virtual DOM&#8221;, \u0111\u00e2y l\u00e0 m\u1ed9t phi\u00ean b\u1ea3n nh\u1eb9 c\u1ee7a DOM th\u1ef1c t\u1ebf. Khi tr\u1ea1ng th\u00e1i thay \u0111\u1ed5i v\u00e0 UI c\u1ea7n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt, m\u1ed9t virtual DOM m\u1edbi \u0111\u01b0\u1ee3c t\u1ea1o ra v\u1edbi tr\u1ea1ng th\u00e1i \u0111\u00e3 c\u1eadp nh\u1eadt. Sau \u0111\u00f3, m\u1ed9t ph\u00e9p so s\u00e1nh (diff) \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n gi\u1eefa virtual DOM m\u1edbi v\u00e0 phi\u00ean b\u1ea3n tr\u01b0\u1edbc \u0111\u00f3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng s\u1ebd t\u00ednh to\u00e1n s\u1ed1 l\u01b0\u1ee3ng thay \u0111\u1ed5i t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u1ea1ng th\u00e1i m\u1edbi v\u00e0 \u00e1p d\u1ee5ng nh\u1eefng thay \u0111\u1ed5i \u0111\u00f3. Ch\u1ec9 nh\u1eefng n\u00fat c\u1ea7n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt m\u1edbi \u0111\u01b0\u1ee3c t\u00e1c \u0111\u1ed9ng, \u0111i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m thi\u1ec3u vi\u1ec7c thao t\u00e1c tr\u1ef1c ti\u1ebfp v\u1edbi DOM th\u1ef1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng virtual DOM mang l\u1ea1i nh\u1eefng l\u1ee3i \u00edch li\u00ean quan \u0111\u1ebfn hi\u1ec7u su\u1ea5t, n\u1ec1n t\u1ea3ng v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t<\/b><span style=\"font-weight: 400;\">: B\u1eb1ng c\u00e1ch ch\u1ec9 c\u1eadp nh\u1eadt c\u00e1c n\u00fat c\u1ee5 th\u1ec3 trong DOM th\u1ef1c, k\u1ef9 thu\u1eadt n\u00e0y gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng c\u1eadp nh\u1eadt, t\u00e1i \u0111\u1ecbnh h\u00ecnh v\u00e0 v\u1ebd l\u1ea1i tr\u00ean giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a \u1ee9ng d\u1ee5ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u0110a n\u1ec1n t\u1ea3ng<\/b><span style=\"font-weight: 400;\">: Virtual DOM cung c\u1ea5p m\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng gi\u1eefa \u1ee9ng d\u1ee5ng v\u00e0 API th\u1ef1c t\u1ebf m\u00e0 render giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i sang c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c mi\u1ec5n l\u00e0 c\u00f3 m\u1ed9t tri\u1ec3n khai virtual DOM cho n\u1ec1n t\u1ea3ng \u0111\u00f3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00ednh nh\u1ea5t qu\u00e1n<\/b><span style=\"font-weight: 400;\">: K\u1ef9 thu\u1eadt n\u00e0y gi\u1eef cho giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng \u0111\u1ed3ng b\u1ed9 v\u1edbi tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9, gi\u1ea3m thi\u1ec3u l\u1ed7i v\u00e0 s\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n.<\/span><\/li>\n<\/ul>\n<h3><b>H\u00e0m l\u00e0 g\u00ec trong JavaScript v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecbnh ngh\u0129a m\u1ed9t h\u00e0m nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><b>H\u00e0m<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t trong nh\u1eefng kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n trong JavaScript. M\u1ed9t h\u00e0m t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t quy tr\u00ecnh \u2014 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c c\u00e2u l\u1ec7nh th\u1ef1c hi\u1ec7n m\u1ed9t nhi\u1ec7m v\u1ee5 ho\u1eb7c t\u00ednh to\u00e1n m\u1ed9t gi\u00e1 tr\u1ecb. Tuy nhi\u00ean, \u0111\u1ec3 m\u1ed9t quy tr\u00ecnh \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n tr\u1edf th\u00e0nh h\u00e0m, n\u00f3 c\u1ea7n nh\u1eadn m\u1ed9t s\u1ed1 \u0111\u1ea7u v\u00e0o v\u00e0 tr\u1ea3 v\u1ec1 m\u1ed9t \u0111\u1ea7u ra, trong \u0111\u00f3 c\u00f3 m\u1ed9t m\u1ed1i quan h\u1ec7 r\u00f5 r\u00e0ng gi\u1eefa \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra.<\/span><\/p>\n<p>Th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ed9t h\u00e0m:<\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">T\u00ean h\u00e0m: L\u00e0 m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t \u0111\u1ec3 g\u1ecdi h\u00e0m.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Tham s\u1ed1: L\u00e0 c\u00e1c gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c truy\u1ec1n v\u00e0o h\u00e0m khi g\u1ecdi h\u00e0m.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Th\u00e2n h\u00e0m: L\u00e0 n\u01a1i ch\u1ee9a c\u00e1c c\u00e2u l\u1ec7nh th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5 c\u1ee7a h\u00e0m.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Gi\u00e1 tr\u1ecb tr\u1ea3 v\u1ec1: L\u00e0 k\u1ebft qu\u1ea3 m\u00e0 h\u00e0m tr\u1ea3 v\u1ec1. N\u1ebfu kh\u00f4ng c\u00f3 c\u00e2u l\u1ec7nh return, h\u00e0m s\u1ebd tr\u1ea3 v\u1ec1 undefined.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">function tenHam(thamSo1, thamSo2, ...) {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ Th\u00e2n h\u00e0m: c\u00e1c c\u00e2u l\u1ec7nh th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0return giaTriTraVe; \/\/ T\u00f9y ch\u1ecdn<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span><\/pre>\n<h3><b>K\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7 l\u00e0 g\u00ec v\u00e0 khi n\u00e0o b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng n\u00f3?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">K\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7 (Server side rendering &#8211; SSR) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt trong \u0111\u00f3 m\u00e1y ch\u1ee7 web t\u1ea1o ra n\u1ed9i dung HTML c\u1ee7a m\u1ed9t trang web v\u00e0 g\u1eedi n\u00f3 \u0111\u1ebfn client (th\u01b0\u1eddng l\u00e0 tr\u00ecnh duy\u1ec7t web) d\u01b0\u1edbi d\u1ea1ng m\u1ed9t t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c render \u0111\u1ea7y \u0111\u1ee7.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng l\u00fd t\u01b0\u1edfng cho SSR:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c trang web gi\u00e0u n\u1ed9i dung<\/b><span style=\"font-weight: 400;\">: C\u00e1c trang tin t\u1ee9c, blog,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c \u1ee9ng d\u1ee5ng n\u1eb7ng v\u1ec1 SEO<\/b><span style=\"font-weight: 400;\">: Khi s\u1ef1 th\u00e0nh c\u00f4ng c\u1ee7a \u1ee9ng d\u1ee5ng web ph\u1ee5 thu\u1ed9c v\u00e0o SEO, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a trang web (v\u00e0 nh\u1edd \u0111\u00f3, hi\u1ec7u su\u1ea5t SEO).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c \u1ee9ng d\u1ee5ng web ti\u1ebfn b\u1ed9<\/b><span style=\"font-weight: 400;\">: Khi \u1ee9ng d\u1ee5ng c\u1ea7n k\u1ebft xu\u1ea5t nhanh \u0111\u1ec3 cung c\u1ea5p tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng nhanh v\u00e0 hi\u1ec7u su\u1ea5t, \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u1ebft xu\u1ea5t ban \u0111\u1ea7u tr\u00ean m\u00e1y ch\u1ee7, sau \u0111\u00f3 \u0111\u01b0\u1ee3c &#8220;hydrated&#8221; tr\u00ean m\u00e1y kh\u00e1ch cho c\u00e1c t\u00edch h\u1ee3p ti\u1ebfp theo.<\/span><\/li>\n<\/ul>\n<h3><b>V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n trong JavaScript ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n (Event Loop) l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i trong JavaScript, cho ph\u00e9p th\u1ef1c thi code b\u1ea5t \u0111\u1ed3ng b\u1ed9. <\/span><a href=\"https:\/\/assets.roadmap.sh\/guest\/javascript-event-loop-explained-d92hx.png\"><span style=\"font-weight: 400;\">H\u00ecnh minh h\u1ecda<\/span><\/a><\/p>\n<p><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a v\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n trong JavaScript nh\u01b0 sau:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m (Call Stack):<\/b><span style=\"font-weight: 400;\"> JavaScript th\u1ef1c thi code tr\u00ean m\u1ed9t lu\u1ed3ng duy nh\u1ea5t b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m, n\u01a1i c\u00e1c cu\u1ed9c g\u1ecdi h\u00e0m \u0111\u01b0\u1ee3c th\u00eam v\u00e0o v\u00e0 th\u1ef1c thi l\u1ea7n l\u01b0\u1ee3t. Khi m\u1ed9t h\u00e0m k\u1ebft th\u00fac, n\u00f3 \u0111\u01b0\u1ee3c x\u00f3a kh\u1ecfi ng\u0103n x\u1ebfp.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c cu\u1ed9c g\u1ecdi b\u1ea5t \u0111\u1ed3ng b\u1ed9 (Async calls):<\/b><span style=\"font-weight: 400;\"> \u0110\u1ed1i v\u1edbi c\u00e1c ho\u1ea1t \u0111\u1ed9ng b\u1ea5t \u0111\u1ed3ng b\u1ed9, JavaScript s\u1eed d\u1ee5ng c\u00e1c Web API do tr\u00ecnh duy\u1ec7t cung c\u1ea5p. C\u00e1c ho\u1ea1t \u0111\u1ed9ng n\u00e0y \u0111\u01b0\u1ee3c chuy\u1ec3n kh\u1ecfi ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m v\u00e0 \u0111\u01b0\u1ee3c x\u1eed l\u00fd ri\u00eang bi\u1ec7t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u00e0ng \u0111\u1ee3i nhi\u1ec7m v\u1ee5 (Task Queue):<\/b><span style=\"font-weight: 400;\"> Khi m\u1ed9t cu\u1ed9c g\u1ecdi b\u1ea5t \u0111\u1ed3ng b\u1ed9 ho\u00e0n th\u00e0nh, h\u00e0m callback \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o h\u00e0ng \u0111\u1ee3i nhi\u1ec7m v\u1ee5.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n:<\/b><span style=\"font-weight: 400;\"> V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n li\u00ean t\u1ee5c ki\u1ec3m tra ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m v\u00e0 h\u00e0ng \u0111\u1ee3i nhi\u1ec7m v\u1ee5. N\u1ebfu ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m tr\u1ed1ng, n\u00f3 l\u1ea5y nhi\u1ec7m v\u1ee5 \u0111\u1ea7u ti\u00ean t\u1eeb h\u00e0ng \u0111\u1ee3i v\u00e0 \u0111\u1ea9y n\u00f3 v\u00e0o ng\u0103n x\u1ebfp g\u1ecdi h\u00e0m \u0111\u1ec3 th\u1ef1c thi. Chu k\u1ef3 n\u00e0y l\u1eb7p l\u1ea1i v\u00f4 h\u1ea1n.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Front_end_ve_Framework_va_Thu_vien\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 Framework v\u00e0 Th\u01b0 vi\u1ec7n<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>C\u00f3 nh\u1eefng Framework Frontend n\u00e0o th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00f3 nhi\u1ec1u framework frontend ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e2y d\u1ef1ng giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, m\u1ed7i framework c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 l\u1ee3i \u00edch ri\u00eang.<\/span><\/p>\n<ul>\n<li><b>React.js<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t trong nh\u1eefng framework n\u1ed5i b\u1eadt, \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi Facebook. V\u1edbi kh\u1ea3 n\u0103ng c\u1eadp nh\u1eadt giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng nhanh ch\u00f3ng m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t, React \u0111\u00e3 c\u00e1ch m\u1ea1ng h\u00f3a vi\u1ec7c t\u1ea1o ra c\u00e1c \u1ee9ng d\u1ee5ng t\u01b0\u01a1ng t\u00e1c nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng m\u1ed9t trang (SPA) v\u00e0 n\u1ec1n t\u1ea3ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed. \u0110i\u1ec3m m\u1ea1nh c\u1ee7a React l\u00e0 vi\u1ec7c s\u1eed d\u1ee5ng JSX, cho ph\u00e9p l\u1eadp tr\u00ecnh vi\u00ean vi\u1ebft m\u00e3 g\u1ea7n gi\u1ed1ng HTML trong JavaScript, c\u00f9ng v\u1edbi Virtual DOM, gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd.<\/span><\/li>\n<li><b>Angular<\/b><span style=\"font-weight: 400;\">, ph\u00e1t tri\u1ec3n b\u1edfi Google, l\u00e0 m\u1ed9t framework m\u1ea1nh m\u1ebd d\u1ef1a tr\u00ean TypeScript. Angular n\u1ed5i b\u1eadt v\u1edbi c\u00e1c t\u00ednh n\u0103ng nh\u01b0 li\u00ean k\u1ebft d\u1eef li\u1ec7u hai chi\u1ec1u v\u00e0 c\u1ea5u tr\u00fac MVC, r\u1ea5t ph\u00f9 h\u1ee3p cho vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng quy m\u00f4 l\u1edbn, ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<li><b>Vue.js<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn nh\u1eb9 nh\u00e0ng v\u00e0 d\u1ec5 h\u1ecdc h\u01a1n, ph\u00f9 h\u1ee3p cho c\u00e1c d\u1ef1 \u00e1n nh\u1ecf v\u00e0 v\u1eeba. V\u1edbi c\u00e1c t\u00ednh n\u0103ng nh\u01b0 li\u00ean k\u1ebft d\u1eef li\u1ec7u ph\u1ea3n \u1ee9ng v\u00e0 ki\u1ebfn tr\u00fac d\u1ef1a tr\u00ean th\u00e0nh ph\u1ea7n, Vue gi\u00fap vi\u1ec7c ph\u00e1t tri\u1ec3n tr\u1edf n\u00ean nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, <\/span><b>Preact<\/b><span style=\"font-weight: 400;\"> v\u00e0 <\/span><b>Svelte<\/b><span style=\"font-weight: 400;\"> c\u0169ng \u0111ang ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng. Preact cung c\u1ea5p hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i v\u1edbi k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n so v\u1edbi React, trong khi Svelte n\u1ed5i b\u1eadt v\u1edbi vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh vanilla JavaScript, gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t \u1ee9ng d\u1ee5ng.<\/span><\/p>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/front-end-framework-library\/\" target=\"_blank\" rel=\"noopener\"><strong>Top 10 Th\u01b0 vi\u1ec7n v\u00e0 Framework front end d\u00f9ng nhi\u1ec1u nh\u1ea5t 2024<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>C\u00f3 nh\u1eefng th\u01b0 vi\u1ec7n Frontend n\u00e0o th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c th\u01b0 vi\u1ec7n frontend \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c c\u1ea3i thi\u1ec7n giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng (UI) v\u00e0 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng (UX). Nh\u1eefng th\u01b0 vi\u1ec7n n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng JavaScript, HTML v\u00e0 CSS, gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean \u0111\u01a1n gi\u1ea3n h\u00f3a c\u00e1c t\u00e1c v\u1ee5 ph\u00e1t tri\u1ec3n.<\/span><\/p>\n<ul>\n<li><b>jQuery<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t trong nh\u1eefng th\u01b0 vi\u1ec7n ph\u1ed5 bi\u1ebfn nh\u1ea5t, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 gi\u1ea3m b\u1edbt s\u1ef1 ph\u1ee9c t\u1ea1p khi thao t\u00e1c v\u1edbi HTML, CSS v\u00e0 JavaScript. V\u1edbi jQuery, l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 vi\u1ebft m\u00e3 ng\u1eafn g\u1ecdn v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n, ti\u1ebft ki\u1ec7m th\u1eddi gian trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/span><\/li>\n<li><b>Bootstrap<\/b><span style=\"font-weight: 400;\">, ph\u00e1t tri\u1ec3n b\u1edfi Twitter, cung c\u1ea5p m\u1ed9t b\u1ed9 c\u00f4ng c\u1ee5 phong ph\u00fa cho vi\u1ec7c t\u1ea1o giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng. Th\u01b0 vi\u1ec7n n\u00e0y bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n, class CSS v\u00e0 JavaScript gi\u00fap vi\u1ec7c thi\u1ebft k\u1ebf trang web tr\u1edf n\u00ean nhanh ch\u00f3ng v\u00e0 linh ho\u1ea1t, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong vi\u1ec7c ph\u00e1t tri\u1ec3n c\u00e1c \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng responsive.<\/span><\/li>\n<li><b>Axios<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t th\u01b0 vi\u1ec7n HTTP m\u00e1y kh\u00e1ch ph\u1ed5 bi\u1ebfn, cho ph\u00e9p th\u1ef1c hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u HTTP m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng t\u1eeb JavaScript, th\u00edch h\u1ee3p cho c\u1ea3 \u1ee9ng d\u1ee5ng frontend v\u00e0 backend.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, <\/span><b>Material-UI<\/b><span style=\"font-weight: 400;\"> cung c\u1ea5p c\u00e1c th\u00e0nh ph\u1ea7n UI cho React, gi\u00fap t\u1ea1o ra giao di\u1ec7n hi\u1ec7n \u0111\u1ea1i d\u1ef1a tr\u00ean nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf Material Design c\u1ee7a Google. Cu\u1ed1i c\u00f9ng, <\/span><b>Sass<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef m\u1edf r\u1ed9ng c\u1ee7a CSS, cung c\u1ea5p nhi\u1ec1u t\u00ednh n\u0103ng gi\u00fap vi\u1ebft m\u00e3 CSS d\u1ec5 d\u00e0ng v\u00e0 linh ho\u1ea1t h\u01a1n, t\u1eeb \u0111\u00f3 l\u00e0m cho m\u00e3 ngu\u1ed3n tr\u1edf n\u00ean d\u1ec5 qu\u1ea3n l\u00fd v\u00e0 t\u00e1i s\u1eed d\u1ee5ng. V\u00e0 c\u00f2n nhi\u1ec1u th\u01b0 vi\u1ec7n kh\u00e1c n\u1eefa.<\/span><\/p>\n<h3><b>So s\u00e1nh s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c framework frontend: React.js, Angular.js, Vue.js<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Framework<\/b><\/td>\n<td><b>React.js<\/b><\/td>\n<td><b>Angular.js<\/b><\/td>\n<td><b> Vue.js<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Hi\u1ec7u su\u1ea5t<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng l\u1edbn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Ch\u00fa tr\u1ecdng v\u00e0o qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 c\u00e1c c\u1eadp nh\u1eadt UI v\u1edbi virtual DOM.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; L\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea5p doanh nghi\u1ec7p.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c d\u1ef1 \u00e1n quy m\u00f4 l\u1edbn v\u1edbi nhi\u1ec1u c\u00f4ng c\u1ee5 t\u00edch h\u1ee3p s\u1eb5n.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Th\u00edch h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng nh\u1ecf.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Thi\u1ebft k\u1ebf nh\u1eb9 v\u00e0 kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng nhanh.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng t\u1ed1t nh\u1edd v\u00e0o ki\u1ebfn tr\u00fac d\u1ef1a tr\u00ean th\u00e0nh ph\u1ea7n.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng t\u1ed1t nh\u1ea5t nh\u1edd v\u00e0o framework to\u00e0n di\u1ec7n v\u00e0 c\u00e1c t\u00ednh n\u0103ng m\u1ea1nh m\u1ebd nh\u01b0 ki\u1ec3u d\u1eef li\u1ec7u m\u1ea1nh v\u00e0 injection ph\u1ee5 thu\u1ed9c.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Linh ho\u1ea1t v\u00e0 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng theo t\u1eebng d\u1ef1 \u00e1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng h\u1ecdc t\u1eadp<\/b><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 ph\u00e1t tri\u1ec3n nhanh nh\u1edd c\u1ea5u tr\u00fac th\u00e0nh ph\u1ea7n v\u00e0 h\u1ec7 sinh th\u00e1i phong ph\u00fa.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 ph\u1ea7n kh\u00f3 h\u1ecdc h\u01a1n v\u00e0 \u0111\u00f2i h\u1ecfi code boilerplate nhi\u1ec1u h\u01a1n.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng khi c\u1ea7n thi\u1ebft l\u1eadp nhanh v\u00e0 d\u1ec5 h\u1ecdc.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u01afu \u0111i\u1ec3m<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 \u0111\u1ed9 linh ho\u1ea1t cao, hi\u1ec7u su\u1ea5t t\u1ed1t, c\u00f3 h\u1ec7 sinh th\u00e1i l\u1edbn v\u00e0 c\u1ed9ng \u0111\u1ed3ng h\u1ed7 tr\u1ee3 m\u1ea1nh m\u1ebd.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">To\u00e0n di\u1ec7n v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng, v\u1edbi c\u00e1c c\u00f4ng c\u1ee5 v\u00e0 t\u00ednh n\u0103ng t\u00edch h\u1ee3p h\u1ed7 tr\u1ee3 c\u00e1c \u1ee9ng d\u1ee5ng l\u1edbn, c\u1ea5p doanh nghi\u1ec7p.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 h\u1ecdc v\u00e0 t\u00edch h\u1ee3p, linh ho\u1ea1t v\u00e0 c\u00f3 \u0111\u01b0\u1eddng cong h\u1ecdc t\u1eadp nh\u1eb9 nh\u00e0ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea7n nhi\u1ec1u c\u1ea5u h\u00ecnh v\u00e0 thi\u1ebft l\u1eadp h\u01a1n, vi\u1ec7c qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i trong c\u00e1c \u1ee9ng d\u1ee5ng l\u1edbn c\u00f3 th\u1ec3 tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng cong h\u1ecdc t\u1eadp d\u1ed1c h\u01a1n v\u00e0 m\u00e3 boilerplate nhi\u1ec1u h\u01a1n, c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n ban \u0111\u1ea7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\"> \u00cdt ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng quy m\u00f4 r\u1ea5t l\u1edbn do h\u1ec7 sinh th\u00e1i nh\u1ecf h\u01a1n.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ch\u1ecdn m\u1ed9t framework ho\u1eb7c th\u01b0 vi\u1ec7n Frontend ph\u00f9 h\u1ee3p v\u1edbi d\u1ef1 \u00e1n?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Khi ch\u1ecdn framework ho\u1eb7c th\u01b0 vi\u1ec7n h\u1ed7 tr\u1ee3 \u0111\u1ec3 l\u1eadp tr\u00ecnh frontend, b\u1ea1n n\u00ean c\u00e2n nh\u1eafc c\u00e1c y\u1ebfu t\u1ed1 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u00e1nh gi\u00e1 c\u00e1c ch\u1ee9c n\u0103ng t\u00edch h\u1ee3p s\u1eb5n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra t\u00ednh t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00f4ng ngh\u1ec7 hi\u1ec7n t\u1ea1i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u01afu ti\u00ean c\u00e1c framework, th\u01b0 vi\u1ec7n c\u00f3 c\u1ed9ng \u0111\u1ed3ng ng\u01b0\u1eddi d\u00f9ng m\u1ea1nh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o h\u1ed7 tr\u1ee3 thi\u1ebft k\u1ebf \u0111\u00e1p \u1ee9ng (responsive design).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L\u1ef1a ch\u1ecdn c\u00e1c framework, th\u01b0 vi\u1ec7n c\u00f3 t\u00e0i li\u1ec7u v\u00e0 h\u01b0\u1edbng d\u1eabn chi ti\u1ebft.<\/span><\/li>\n<\/ul>\n<h3><b>jQuery v\u00e0 JavaScript c\u00f3 g\u00ec kh\u00e1c nhau?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">jQuery v\u00e0 JavaScript \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t tri\u1ec3n web, nh\u01b0ng ch\u00fang kh\u00e1c nhau v\u1ec1 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng v\u00e0 m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng:<\/span><\/p>\n<p><b>JavaScript<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh ch\u00ednh trong ph\u00e1t tri\u1ec3n web, cho ph\u00e9p b\u1ea1n \u0111i\u1ec1u khi\u1ec3n n\u1ed9i dung, th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh, x\u1eed l\u00fd s\u1ef1 ki\u1ec7n v\u00e0 t\u1ea1o ra c\u00e1c \u1ee9ng d\u1ee5ng t\u01b0\u01a1ng t\u00e1c. JavaScript cung c\u1ea5p nhi\u1ec1u API, nh\u01b0ng vi\u1ec7c x\u1eed l\u00fd DOM, s\u1ef1 ki\u1ec7n v\u00e0 AJAX trong JavaScript nguy\u00ean b\u1ea3n c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p v\u00e0 d\u00e0i d\u00f2ng.<\/span><\/p>\n<p><b>jQuery<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t th\u01b0 vi\u1ec7n JavaScript \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n h\u00f3a c\u00e1c thao t\u00e1c trong JavaScript, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c t\u00e1c v\u1ee5 nh\u01b0 thao t\u00e1c v\u1edbi DOM, x\u1eed l\u00fd s\u1ef1 ki\u1ec7n, hi\u1ec7u \u1ee9ng v\u00e0 AJAX. N\u00f3 gi\u00fap m\u00e3 ng\u1eafn g\u1ecdn h\u01a1n v\u00e0 d\u1ec5 \u0111\u1ecdc h\u01a1n. Thay v\u00ec vi\u1ebft nhi\u1ec1u d\u00f2ng JavaScript \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t thao t\u00e1c, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9 c\u1ea7n v\u00e0i d\u00f2ng jQuery.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>JavaScript<\/b><\/td>\n<td><b>jQuery<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">JavaScript l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa ECMA Script v\u00e0 DOM (Document Object Model).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">jQuery s\u1eed d\u1ee5ng c\u00e1c t\u00e0i nguy\u00ean m\u00e0 JavaScript cung c\u1ea5p. N\u00f3i c\u00e1ch kh\u00e1c, \u0111\u00e2y l\u00e0 m\u1ed9t th\u01b0 vi\u1ec7n JavaScript nh\u1eb9, ch\u1ec9 c\u00f3 DOM.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u1ea7n su\u1ea5t vi\u1ebft code<\/b><\/td>\n<td><span style=\"font-weight: 400;\">JavaScript y\u00eau c\u1ea7u vi\u1ebft nhi\u1ec1u d\u00f2ng code h\u01a1n v\u00ec l\u1eadp tr\u00ecnh vi\u00ean ph\u1ea3i t\u1ef1 vi\u1ebft code t\u1eeb \u0111\u1ea7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">V\u1edbi jQuery, l\u1eadp tr\u00ecnh vi\u00ean vi\u1ebft \u00edt code h\u01a1n so v\u1edbi JavaScript. Thay v\u00e0o \u0111\u00f3, ch\u1ec9 c\u1ea7n nh\u1eadp th\u01b0 vi\u1ec7n v\u00e0 s\u1eed d\u1ee5ng c\u00e1c h\u00e0m ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c c\u1ee5 th\u1ec3 trong th\u01b0 vi\u1ec7n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea7n vi\u1ebft th\u00eam code ho\u1eb7c \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec1u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch \u0111a tr\u00ecnh duy\u1ec7t.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 t\u00ednh n\u0103ng t\u00edch h\u1ee3p s\u1eb5n, kh\u00f4ng c\u1ea7n ph\u1ea3i vi\u1ebft th\u00eam code hay \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 code ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t kh\u00e1c.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ee9c t\u1ea1p v\u00ec l\u1eadp tr\u00ecnh vi\u00ean ph\u1ea3i t\u1ef1 vi\u1ebft code cho k\u1ecbch b\u1ea3n c\u1ee7a m\u00ecnh, vi\u1ec7c n\u00e0y ti\u00eau t\u1ed1n th\u1eddi gian.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u1eafn g\u1ecdn h\u01a1n, kh\u00f4ng c\u1ea7n vi\u1ebft nhi\u1ec1u code v\u00ec c\u00e1c k\u1ecbch b\u1ea3n \u0111\u00e3 t\u1ed3n t\u1ea1i s\u1eb5n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u1ee7a tr\u00ecnh duy\u1ec7t<\/b><\/td>\n<td><span style=\"font-weight: 400;\">JavaScript thu\u1ea7n c\u00f3 th\u1ec3 nhanh h\u01a1n trong vi\u1ec7c ch\u1ecdn\/l\u00e0m vi\u1ec7c v\u1edbi DOM so v\u1edbi jQuery v\u00ec JavaScript \u0111\u01b0\u1ee3c tr\u00ecnh duy\u1ec7t x\u1eed l\u00fd tr\u1ef1c ti\u1ebfp, gi\u1ea3m thi\u1ec3u \u0111\u1ed9 tr\u1ec5 m\u00e0 jQuery c\u00f3.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">jQuery nhanh v\u1edbi c\u00e1c tr\u00ecnh duy\u1ec7t v\u00e0 m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i, nh\u01b0ng n\u00f3 c\u1ea7n chuy\u1ec3n th\u00e0nh JavaScript \u0111\u1ec3 ch\u1ea1y tr\u00ean tr\u00ecnh duy\u1ec7t.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng t\u1ea1o animation<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 t\u1ea1o animation trong JavaScript b\u1eb1ng c\u00e1ch vi\u1ebft nhi\u1ec1u code, ch\u1ee7 y\u1ebfu l\u00e0 thay \u0111\u1ed5i phong c\u00e1ch c\u1ee7a trang HTML.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 th\u00eam animation d\u1ec5 d\u00e0ng v\u1edbi \u00edt code h\u01a1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng ph\u1ee5 thu\u1ed9c<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u00f4n ng\u1eef \u0111\u1ed9c l\u1eadp v\u00e0 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i ri\u00eang l\u1ebb.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1ed9t th\u01b0 vi\u1ec7n c\u1ee7a JavaScript, kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 JavaScript.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Front_end_ve_quy_trinh_lap_trinh_va_cong_cu\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front end v\u1ec1 quy tr\u00ecnh l\u1eadp tr\u00ecnh v\u00e0 c\u00f4ng c\u1ee5<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>B\u1ea1n c\u00f3 th\u1ec3 g\u1ecdi web service b\u1eb1ng nh\u1eefng c\u00e1ch n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">B\u1ea1n c\u00f3 th\u1ec3 g\u1ecdi web service b\u1eb1ng nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, bao g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>XMLHttpRequest<\/b><span style=\"font-weight: 400;\">: Ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n th\u1ed1ng \u0111\u1ec3 g\u1ecdi web service trong JavaScript.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>fetch<\/b><span style=\"font-weight: 400;\">: API hi\u1ec7n \u0111\u1ea1i cho ph\u00e9p g\u1eedi y\u00eau c\u1ea7u v\u00e0 nh\u1eadn ph\u1ea3n h\u1ed3i d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Axios<\/b><span style=\"font-weight: 400;\">: M\u1ed9t th\u01b0 vi\u1ec7n m\u00e3 ngu\u1ed3n m\u1edf ph\u1ed5 bi\u1ebfn, cung c\u1ea5p c\u00fa ph\u00e1p ng\u1eafn g\u1ecdn v\u00e0 h\u1ed7 tr\u1ee3 nhi\u1ec1u t\u00ednh n\u0103ng h\u1eefu \u00edch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>jQuery (s\u1eed d\u1ee5ng $.ajax())<\/b><span style=\"font-weight: 400;\">: Ph\u01b0\u01a1ng ph\u00e1p t\u1eeb jQuery \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u AJAX m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>WebSocket<\/b><span style=\"font-weight: 400;\">: \u0110\u00e2y l\u00e0 m\u1ed9t giao th\u1ee9c hai chi\u1ec1u, cho ph\u00e9p trao \u0111\u1ed5i d\u1eef li\u1ec7u theo th\u1eddi gian th\u1ef1c gi\u1eefa client v\u00e0 server. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 g\u1ecdi web service theo c\u00e1ch kh\u00e1c so v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p HTTP truy\u1ec1n th\u1ed1ng.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">M\u1ed7i ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec1u c\u00f3 nh\u1eefng \u01b0u \u0111i\u1ec3m ri\u00eang, gi\u00fap b\u1ea1n linh ho\u1ea1t l\u1ef1a ch\u1ecdn theo nhu c\u1ea7u v\u00e0 c\u00f4ng ngh\u1ec7 \u0111ang s\u1eed d\u1ee5ng.<\/span><\/p>\n<h3><b>Git l\u00e0 g\u00ec? T\u1ea1i sao Git quan tr\u1ecdng trong l\u1eadp tr\u00ecnh Frontend?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n (version control) gi\u00fap theo d\u00f5i v\u00e0 ch\u1ec9nh s\u1eeda code c\u1ee7a d\u1ef1 \u00e1n. Git \u0111\u01b0\u1ee3c xem l\u00e0 m\u1ed9t ph\u1ea7n m\u1ec1m ph\u1ed5 bi\u1ebfn d\u00f9ng \u0111\u1ec3 qu\u1ea3n l\u00fd code. N\u1ebfu code g\u1eb7p s\u1ef1 c\u1ed1, l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Git \u0111\u1ec3 quay l\u1ea1i phi\u00ean b\u1ea3n tr\u01b0\u1edbc \u0111\u00f3 thay v\u00ec ph\u1ea3i s\u1eeda l\u1ea1i to\u00e0n b\u1ed9 b\u1eb1ng tay. Vi\u1ec7c h\u1ecdc Git c\u0169ng gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean c\u1ed9ng t\u00e1c v\u1edbi c\u00e1c th\u00e0nh vi\u00ean kh\u00e1c trong nh\u00f3m v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c thay \u0111\u1ed5i tr\u00ean c\u00f9ng m\u1ed9t m\u00e3 code t\u1eeb nhi\u1ec1u \u0111\u1ecba \u0111i\u1ec3m kh\u00e1c nhau.\u00a0<\/span><\/p>\n<h3><b>Webpack l\u00e0 g\u00ec? Vai tr\u00f2 c\u1ee7a webpack trong l\u1eadp tr\u00ecnh Frontend?<\/b><\/h3>\n<p><b>Webpack<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 (module bundler) d\u00f9ng \u0111\u1ec3 bi\u00ean d\u1ecbch v\u00e0 g\u1ed9p t\u1ea5t c\u1ea3 c\u00e1c module JavaScript, CSS, h\u00ecnh \u1ea3nh, v\u00e0 c\u00e1c t\u00e0i nguy\u00ean kh\u00e1c th\u00e0nh c\u00e1c t\u1ec7p duy nh\u1ea5t, gi\u00fap gi\u1ea3m t\u1ea3i l\u01b0\u1ee3ng y\u00eau c\u1ea7u HTTP t\u1eeb tr\u00ecnh duy\u1ec7t khi t\u1ea3i trang.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Webpack \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn trong l\u1eadp tr\u00ecnh frontend \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a \u1ee9ng d\u1ee5ng v\u00e0 t\u0103ng hi\u1ec7u su\u1ea5t th\u00f4ng qua c\u00e1c t\u00ednh n\u0103ng sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n<\/b><span style=\"font-weight: 400;\">: Khi thay \u0111\u1ed5i nh\u1ecf trong JavaScript, Webpack kh\u00f4ng y\u00eau c\u1ea7u t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang. V\u1edbi c\u00e1c loader, CSS c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt t\u01b0\u01a1ng t\u1ef1, gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 gi\u1ea3m th\u1eddi gian t\u1ea3i khi g\u1ee1 l\u1ed7i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u1ea3m xung \u0111\u1ed9t bi\u1ebfn to\u00e0n c\u1ee5c<\/b><span style=\"font-weight: 400;\">: Webpack cung c\u1ea5p h\u1ec7 th\u1ed1ng module d\u1ef1a tr\u00ean ES6, trong \u0111\u00f3 m\u1ed7i file l\u00e0 m\u1ed9t module ri\u00eang bi\u1ec7t v\u00e0 c\u00e1c bi\u1ebfn s\u1ebd ch\u1ec9 c\u00f3 ph\u1ea1m vi c\u1ee5c b\u1ed9 trong file \u0111\u00f3, tr\u00e1nh ghi \u0111\u00e8 l\u00ean c\u00e1c bi\u1ebfn to\u00e0n c\u1ee5c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Chia t\u00e1ch m\u00e3 ngu\u1ed3n<\/b><span style=\"font-weight: 400;\">: Webpack cho ph\u00e9p chia nh\u1ecf m\u00e3 th\u00e0nh c\u00e1c module ri\u00eang bi\u1ec7t v\u00e0 c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng t\u00ednh n\u0103ng t\u1eeb file n\u00e0y sang file kh\u00e1c, gi\u00fap qu\u1ea3n l\u00fd m\u00e3 d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Minification<\/b><span style=\"font-weight: 400;\">: Webpack t\u1ed1i \u01b0u h\u00f3a m\u00e3 b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng, xu\u1ed1ng d\u00f2ng, m\u00e3 kh\u00f4ng c\u1ea7n thi\u1ebft v\u00e0 r\u00fat ng\u1eafn t\u00ean bi\u1ebfn, gi\u00fap gi\u1ea3m dung l\u01b0\u1ee3ng file.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ed7 tr\u1ee3 Feature Flagging<\/b><span style=\"font-weight: 400;\">: V\u1edbi feature flagging, Webpack cho ph\u00e9p g\u1eedi m\u00e3 \u0111\u1ebfn c\u00e1c m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau trong qu\u00e1 tr\u00ecnh ki\u1ec3m th\u1eed t\u00ednh n\u0103ng, h\u1ed7 tr\u1ee3 t\u1ed1t cho c\u1ea3 ph\u00e1t tri\u1ec3n v\u00e0 ki\u1ec3m th\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tree Shaking<\/b><span style=\"font-weight: 400;\">: Webpack lo\u1ea1i b\u1ecf m\u00e3 kh\u00f4ng s\u1eed d\u1ee5ng kh\u1ecfi b\u1ea3n build cu\u1ed1i, gi\u00fap gi\u1ea3m k\u00edch th\u01b0\u1edbc file b\u1eb1ng c\u00e1ch ch\u1ec9 gi\u1eef l\u1ea1i nh\u1eefng m\u00e3 c\u1ea7n thi\u1ebft cho s\u1ea3n ph\u1ea9m.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Dynamic Imports<\/b><span style=\"font-weight: 400;\">: V\u1edbi dynamic imports, Webpack c\u00f3 th\u1ec3 t\u1ea3i module kh\u00f4ng \u0111\u1ed3ng b\u1ed9 khi c\u1ea7n, gi\u00fap gi\u1ea3m th\u1eddi gian t\u1ea3i trang ban \u0111\u1ea7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Code Analysis and Profiling<\/b><span style=\"font-weight: 400;\">: Webpack cung c\u1ea5p c\u00e1c c\u00f4ng c\u1ee5 \u0111\u1ec3 ph\u00e2n t\u00edch v\u00e0 t\u1ed1i \u01b0u h\u00f3a m\u00e3, gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 n\u00e2ng cao tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng.<\/span><\/li>\n<\/ul>\n<h3><b>M\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t cho l\u1eadp tr\u00ecnh frontend l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t web ch\u1ee7 y\u1ebfu bao g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>N\u00e9n h\u00ecnh \u1ea3nh:<\/b><span style=\"font-weight: 400;\"> Gi\u1ea3m k\u00edch th\u01b0\u1edbc file h\u00ecnh \u1ea3nh m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Minify CSS v\u00e0 JavaScript:<\/b><span style=\"font-weight: 400;\"> Lo\u1ea1i b\u1ecf c\u00e1c kho\u1ea3ng tr\u1eafng, comment v\u00e0 c\u00e1c k\u00fd t\u1ef1 kh\u00f4ng c\u1ea7n thi\u1ebft trong file CSS v\u00e0 JavaScript \u0111\u1ec3 gi\u1ea3m k\u00edch th\u01b0\u1edbc file.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Combine files:<\/b><span style=\"font-weight: 400;\"> K\u1ebft h\u1ee3p nhi\u1ec1u file nh\u1ecf th\u00e0nh m\u1ed9t file l\u1edbn \u0111\u1ec3 gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u HTTP.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Caching:<\/b><span style=\"font-weight: 400;\"> L\u01b0u tr\u1eef c\u00e1c file t\u0129nh (h\u00ecnh \u1ea3nh, CSS, JavaScript) trong b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t \u0111\u1ec3 kh\u00f4ng ph\u1ea3i t\u1ea3i l\u1ea1i m\u1ed7i khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp trang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Lazy loading:<\/b><span style=\"font-weight: 400;\"> Ch\u1ec9 t\u1ea3i c\u00e1c n\u1ed9i dung c\u1ea7n thi\u1ebft khi ng\u01b0\u1eddi d\u00f9ng cu\u1ed9n \u0111\u1ebfn v\u1ecb tr\u00ed \u0111\u00f3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Code splitting:<\/b><span style=\"font-weight: 400;\"> Chia nh\u1ecf c\u00e1c bundle JavaScript l\u1edbn th\u00e0nh c\u00e1c bundle nh\u1ecf h\u01a1n \u0111\u1ec3 ch\u1ec9 t\u1ea3i nh\u1eefng g\u00ec c\u1ea7n thi\u1ebft cho m\u1ed7i trang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Server-side rendering:<\/b><span style=\"font-weight: 400;\"> Render trang web \u1edf ph\u00eda m\u00e1y ch\u1ee7 tr\u01b0\u1edbc khi g\u1eedi \u0111\u1ebfn tr\u00ecnh duy\u1ec7t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>CDN (Content Delivery Network):<\/b><span style=\"font-weight: 400;\"> S\u1eed d\u1ee5ng m\u1ea1ng ph\u00e2n ph\u1ed1i n\u1ed9i dung \u0111\u1ec3 ph\u00e2n t\u00e1n c\u00e1c file t\u0129nh tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 tr\u00ean to\u00e0n c\u1ea7u, gi\u00fap gi\u1ea3m th\u1eddi gian t\u1ea3i.<\/span><\/li>\n<\/ul>\n<h3><b>Lazy loading l\u00e0 g\u00ec? L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 th\u1ef1c hi\u1ec7n lazy loading trong JavaScript\/ React\/ Vue?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Lazy loading (t\u1ea3i ch\u1eadm) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u h\u00f3a trong l\u1eadp tr\u00ecnh web, trong \u0111\u00f3 c\u00e1c t\u00e0i nguy\u00ean nh\u01b0 h\u00ecnh \u1ea3nh, video ho\u1eb7c component ch\u1ec9 \u0111\u01b0\u1ee3c t\u1ea3i khi ng\u01b0\u1eddi d\u00f9ng th\u1ef1c s\u1ef1 c\u1ea7n \u0111\u1ebfn ch\u00fang, thay v\u00ec t\u1ea3i t\u1ea5t c\u1ea3 ngay t\u1eeb \u0111\u1ea7u.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lazy loading th\u01b0\u1eddng s\u1eed d\u1ee5ng m\u1ed9t k\u1ef9 thu\u1eadt g\u1ecdi l\u00e0 <\/span><b>Intersection Observer API<\/b><span style=\"font-weight: 400;\"> trong JavaScript \u0111\u1ec3 theo d\u00f5i khi n\u00e0o m\u1ed9t ph\u1ea7n t\u1eed \u0111i v\u00e0o ho\u1eb7c ra kh\u1ecfi v\u00f9ng nh\u00ecn th\u1ea5y c\u1ee7a ng\u01b0\u1eddi d\u00f9ng (viewport). Khi ph\u1ea7n t\u1eed s\u1eafp xu\u1ea5t hi\u1ec7n trong viewport, lazy loading s\u1ebd b\u1eaft \u0111\u1ea7u t\u1ea3i n\u00f3.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trong JavaScript thu\u1ea7n, lazy loading \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng ch\u1ee7 y\u1ebfu cho h\u00ecnh \u1ea3nh v\u00e0 video b\u1eb1ng c\u00e1ch d\u00f9ng IntersectionObserver.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trong React, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng t\u00ednh n\u0103ng React.lazy c\u00f9ng v\u1edbi Suspense \u0111\u1ec3 lazy load c\u00e1c component.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trong Vue, c\u00f3 th\u1ec3 d\u00f9ng t\u00ednh n\u0103ng dynamic import v\u1edbi Vue.component ho\u1eb7c import() \u0111\u1ec3 th\u1ef1c hi\u1ec7n lazy load c\u00e1c component.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket_cau_hoi_phong_van_Front_End\"><\/span><strong>T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec s\u1ebd cung c\u1ea5p nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End d\u00e0nh cho Front End Developer, Web Developer,&#8230; v\u1edbi \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ki\u1ebfn th\u1ee9c: HTML, CSS, JavaScript, Framework, Th\u01b0 vi\u1ec7n Frontend,&#8230; D\u00f9 b\u1ea1n l\u00e0 ng\u01b0\u1eddi m\u1edbi hay l\u00e0 ng\u01b0\u1eddi \u0111\u00e3 c\u00f3 kinh nghi\u1ec7m, nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End k\u00e8m [&hellip;]<\/p>\n","protected":false},"author":213,"featured_media":81686,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109],"tags":[],"class_list":["post-81395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn - ITviec Blog<\/title>\n<meta name=\"description\" content=\"L\u01b0u ngay nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End v\u1edbi c\u00e1c ch\u1ee7 \u0111\u1ec1: HTML, CSS, JavaScript, Framework, Th\u01b0 vi\u1ec7n Frontend,... c\u00f9ng c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn\" \/>\n<meta property=\"og:description\" content=\"Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec s\u1ebd cung c\u1ea5p nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End d\u00e0nh cho Front End Developer, Web Developer,... v\u1edbi \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ki\u1ebfn th\u1ee9c: HTML,\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/\" \/>\n<meta property=\"og:site_name\" content=\"ITviec Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ITviec\" \/>\n<meta property=\"article:published_time\" content=\"2024-11-25T02:10:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"790\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Linh Trao\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ITviec\" \/>\n<meta name=\"twitter:site\" content=\"@ITviec\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Linh Trao\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"34 ph\u00fat\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn - ITviec Blog","description":"L\u01b0u ngay nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End v\u1edbi c\u00e1c ch\u1ee7 \u0111\u1ec1: HTML, CSS, JavaScript, Framework, Th\u01b0 vi\u1ec7n Frontend,... c\u00f9ng c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/","og_locale":"vi_VN","og_type":"article","og_title":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn","og_description":"Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec s\u1ebd cung c\u1ea5p nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End d\u00e0nh cho Front End Developer, Web Developer,... v\u1edbi \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ki\u1ebfn th\u1ee9c: HTML,","og_url":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/","og_site_name":"ITviec Blog","article_publisher":"https:\/\/www.facebook.com\/ITviec","article_published_time":"2024-11-25T02:10:09+00:00","og_image":[{"width":1500,"height":790,"url":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg","type":"image\/jpeg"}],"author":"Linh Trao","twitter_card":"summary_large_image","twitter_creator":"@ITviec","twitter_site":"@ITviec","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"Linh Trao","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"34 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#article","isPartOf":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/"},"author":{"name":"Linh Trao","@id":"https:\/\/itviec.com\/blog\/#\/schema\/person\/6d1bcbfa05475cbc5a2eaf0727501a16"},"headline":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn","datePublished":"2024-11-25T02:10:09+00:00","mainEntityOfPage":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/"},"wordCount":9235,"publisher":{"@id":"https:\/\/itviec.com\/blog\/#organization"},"image":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#primaryimage"},"thumbnailUrl":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg","articleSection":["Chuy\u00ean m\u00f4n IT"],"inLanguage":"vi"},{"@type":"WebPage","@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/","url":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/","name":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn - ITviec Blog","isPartOf":{"@id":"https:\/\/itviec.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#primaryimage"},"image":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#primaryimage"},"thumbnailUrl":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg","datePublished":"2024-11-25T02:10:09+00:00","description":"L\u01b0u ngay nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End v\u1edbi c\u00e1c ch\u1ee7 \u0111\u1ec1: HTML, CSS, JavaScript, Framework, Th\u01b0 vi\u1ec7n Frontend,... c\u00f9ng c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft.","breadcrumb":{"@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/"]}]},{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#primaryimage","url":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg","contentUrl":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/11\/cau-hoi-phong-van-Frontend-vippro.jpg","width":1500,"height":790,"caption":"ca\u0302u ho\u0309i pho\u0309ng va\u0302\u0301n Front end - vippro"},{"@type":"BreadcrumbList","@id":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-front-end\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Chuy\u00ean m\u00f4n IT","item":"https:\/\/itviec.com\/blog\/chuyen-mon-it\/"},{"@type":"ListItem","position":2,"name":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End Developer ph\u1ed5 bi\u1ebfn"}]},{"@type":"WebSite","@id":"https:\/\/itviec.com\/blog\/#website","url":"https:\/\/itviec.com\/blog\/","name":"ITviec Blog","description":"IT Jobs &amp; People in Vietnam","publisher":{"@id":"https:\/\/itviec.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/itviec.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"vi"},{"@type":"Organization","@id":"https:\/\/itviec.com\/blog\/#organization","name":"ITviec","url":"https:\/\/itviec.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/itviec.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2018\/12\/itviec-black-square-facebook.png","contentUrl":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2018\/12\/itviec-black-square-facebook.png","width":1800,"height":1800,"caption":"ITviec"},"image":{"@id":"https:\/\/itviec.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/ITviec","https:\/\/x.com\/ITviec","https:\/\/www.linkedin.com\/company\/itviec","https:\/\/www.youtube.com\/channel\/UCYthAQ3bcGr57M_ag5gHDvQ"]},{"@type":"Person","@id":"https:\/\/itviec.com\/blog\/#\/schema\/person\/6d1bcbfa05475cbc5a2eaf0727501a16","name":"Linh Trao","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/trao-thi-tung-linh-author-e1709892478113-100x100.jpg","url":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/trao-thi-tung-linh-author-e1709892478113-100x100.jpg","contentUrl":"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/trao-thi-tung-linh-author-e1709892478113-100x100.jpg","caption":"Linh Trao"},"url":"https:\/\/itviec.com\/blog\/author\/linh-trao\/"}]}},"_links":{"self":[{"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/posts\/81395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/users\/213"}],"replies":[{"embeddable":true,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/comments?post=81395"}],"version-history":[{"count":0,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/posts\/81395\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/media\/81686"}],"wp:attachment":[{"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/media?parent=81395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/categories?post=81395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itviec.com\/blog\/wp-json\/wp\/v2\/tags?post=81395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}