{"id":83258,"date":"2025-01-01T17:17:25","date_gmt":"2025-01-01T10:17:25","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=83258"},"modified":"2025-01-01T17:17:25","modified_gmt":"2025-01-01T10:17:25","slug":"cau-hoi-phong-van-web-developer","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-web-developer\/","title":{"rendered":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web 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-web-developer\/#Web_Developer_la_gi_Luong_Web_Developer_nhu_the_nao\" >Web Developer l\u00e0 g\u00ec? L\u01b0\u01a1ng Web Developer nh\u01b0 th\u1ebf n\u00e0o?<\/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-web-developer\/#Cau_hoi_phong_van_Web_Developer_danh_cho_Fresher_Junior_Web_Developer\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Fresher \/ Junior Web Developer<\/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-web-developer\/#Cau_hoi_phong_van_Web_Developer_danh_cho_Middle_Web_Developer\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Middle Web Developer<\/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-web-developer\/#Cau_hoi_phong_van_Web_Developer_danh_cho_Senior_Web_Developer\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Senior Web Developer<\/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-web-developer\/#Tong_ket\" >T\u1ed5ng k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n<p><em><strong>\u1ede v\u1ecb tr\u00ed Web Developer, b\u1ea1n ph\u1ea3i n\u1eafm th\u1eadt r\u00f5 nh\u1eefng ki\u1ebfn th\u1ee9c m\u1edbi c\u00f3 th\u1ec3 th\u1ef1c h\u00e0nh t\u1ed1t m\u1ea3ng Frontend ho\u1eb7c Backend m\u00e0 m\u00ecnh \u0111\u00e3 ch\u1ecdn. Tuy nhi\u00ean \u0111\u00f4i khi, s\u1ef1 s\u00e2u r\u1ed9ng, phong ph\u00fa v\u1ec1 ki\u1ebfn th\u1ee9c c\u1ee7a t\u1eebng m\u1ea3ng c\u00f3 th\u1ec3 khi\u1ebfn b\u1ea1n c\u1ea3m th\u1ea5y m\u00f4ng lung, kh\u00f4ng bi\u1ebft b\u1eaft \u0111\u1ea7u t\u1eeb \u0111\u00e2u. Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec \u0111\u00e3 h\u1ec7 th\u1ed1ng 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer th\u01b0\u1eddng g\u1eb7p nh\u1ea5t gi\u00fap b\u1ea1n gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 tr\u00ean.<\/strong><\/em><\/p>\n<p>\u0110\u1ecdc b\u00e0i vi\u1ebft sau \u0111\u1ec3 n\u1eafm v\u1eefng c\u00e1ch tr\u1ea3 l\u1eddi:<\/p>\n<ul>\n<li>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Fresher v\u00e0 Junior Web Developer<\/li>\n<li>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Middle Web Developer<\/li>\n<li>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Senior Web Developer<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Web_Developer_la_gi_Luong_Web_Developer_nhu_the_nao\"><\/span><b>Web Developer l\u00e0 g\u00ec? L\u01b0\u01a1ng Web Developer nh\u01b0 th\u1ebf n\u00e0o?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Web Developer l\u00e0 nh\u1eefng l\u1eadp tr\u00ecnh vi\u00ean ch\u1ecbu tr\u00e1ch nhi\u1ec7m x\u00e2y d\u1ef1ng v\u00e0 duy tr\u00ec c\u00e1c website c\u0169ng nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng d\u1ef1a tr\u00ean web nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i (Facebook, Instagram, LinkedIn ho\u1eb7c c\u00e1c trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed (Amazon, Shopee, Lazada,&#8230;).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c Web Developer c\u00f3 th\u1ec3 thu\u1ed9c m\u1ed9t trong ba nh\u00f3m: Backend Developer (L\u1eadp tr\u00ecnh vi\u00ean Backend), Frontend Developer (L\u1eadp tr\u00ecnh vi\u00ean Frontend) v\u00e0 Full-stack Developer (L\u1eadp tr\u00ecnh vi\u00ean Full-stack). Ngo\u00e0i ra, Web Developer c\u00f2n c\u00f3 v\u1ecb tr\u00ed qu\u1ea3n tr\u1ecb vi\u00ean web (Webmasters) &#8211; l\u00e0 nh\u1eefng ng\u01b0\u1eddi \u0111\u1ea3m b\u1ea3o trang web lu\u00f4n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt v\u00e0 c\u00e1c li\u00ean k\u1ebft ho\u1eb7c \u1ee9ng d\u1ee5ng tr\u00ean t\u1eebng trang ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f4ng vi\u1ec7c c\u1ee7a m\u1ed9t Web Developer th\u01b0\u1eddng l\u00e0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Thi\u1ebft k\u1ebf giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng v\u00e0 menu \u0111i\u1ec1u h\u01b0\u1edbng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vi\u1ebft v\u00e0 ki\u1ec3m tra code cho website (th\u01b0\u1eddng l\u00e0 HTML, CSS, PHP ho\u1eb7c JavaScript)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u00edch h\u1ee3p n\u1ed9i dung \u0111a ph\u01b0\u01a1ng ti\u1ec7n v\u00e0o website<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra c\u00e1c \u1ee9ng d\u1ee5ng web<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u1eafc ph\u1ee5c c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn hi\u1ec7u su\u1ea5t ho\u1eb7c tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf, l\u1eadp tr\u00ecnh vi\u00ean, v\u00e0 c\u00e1c b\u00ean li\u00ean quan<\/span><\/li>\n<\/ul>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/web-developer-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>Web Developer l\u00e0 g\u00ec: \u0110\u1ecbnh ngh\u0129a, Tr\u00e1ch nhi\u1ec7m v\u00e0 L\u1ed9 tr\u00ecnh h\u1ecdc t\u1eadp<\/strong><\/a><\/em><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">Theo <a href=\"https:\/\/itviec.com\/bao-cao\/luong-it-va-thi-truong-tuyen-dung-it-vietnam\" target=\"_blank\" rel=\"noopener\"><strong>B\u00e1o c\u00e1o L\u01b0\u01a1ng v\u00e0 Th\u1ecb tr\u01b0\u1eddng Tuy\u1ec3n d\u1ee5ng IT t\u1ea1i Vi\u1ec7t Nam 2024 &#8211; 2025<\/strong><\/a> m\u1edbi nh\u1ea5t do ITviec th\u1ef1c hi\u1ec7n, m\u1ee9c l\u01b0\u01a1ng trung v\u1ecb c\u1ee7a Web Developer nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td rowspan=\"2\"><strong>Kho\u1ea3ng n\u0103m kinh nghi\u1ec7m<\/strong><\/td>\n<td colspan=\"3\"><strong>M\u1ee9c l\u01b0\u01a1ng trung v\u1ecb (\u0111\u01a1n v\u1ecb: VND\/ th\u00e1ng)<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Back-end Developer<\/strong><\/td>\n<td><strong>Front-end Developer<\/strong><\/td>\n<td><strong>Full-stack Developer<\/strong><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">&lt; 1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">N\/A<\/span><\/td>\n<td><span style=\"font-weight: 400;\">N\/A<\/span><\/td>\n<td><span style=\"font-weight: 400;\">14.700.000<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1-2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">19.200.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">16.100.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">16.650.000<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3-4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">26.000.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">23.300.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">29.900.000<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">5-8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">45.300.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">34.950.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">39.700.000<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">&gt; 8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">54.500.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">50.950.000<\/span><\/td>\n<td><span style=\"font-weight: 400;\">50.000.000<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Web_Developer_danh_cho_Fresher_Junior_Web_Developer\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Fresher \/ Junior Web Developer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Theo b\u1ea1n, Web Developer c\u00f3 g\u00ec kh\u00e1c so v\u1edbi Full stack Developer?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">S\u1ef1 kh\u00e1c nhau c\u1ee7a Web Developer v\u00e0 Full stack Developer c\u00f3 th\u1ec3 th\u1ed1ng k\u00ea nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Y\u1ebfu t\u1ed1<\/b><\/td>\n<td><b>Web Developer<\/b><\/td>\n<td><b>Full stack Developer<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Chuy\u00ean m\u00f4n<\/b><\/td>\n<td><span style=\"font-weight: 400;\">T\u1eadp trung v\u00e0o Frontend ho\u1eb7c Backend<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 ki\u1ebfn th\u1ee9c c\u1ea3 hai m\u1ea3ng Frontend v\u00e0 Backend<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Skillset<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chuy\u00ean v\u1ec1 c\u00f4ng ngh\u1ec7 Frontend ho\u1eb7c Backend<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ed9 k\u1ef9 n\u0103ng r\u1ed9ng h\u01a1n bao g\u1ed3m c\u1ea3 front-end v\u00e0 back-end<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>C\u00f4ng vi\u1ec7c c\u1ee5 th\u1ec3<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00e1c c\u00f4ng vi\u1ec7c c\u1ee5 th\u1ec3 c\u00f3 li\u00ean quan \u0111\u1ebfn l\u1eadp tr\u00ecnh UX\/UI, k\u1ecbch b\u1ea3n ph\u00eda m\u00e1y ch\u1ee7 (server-side scripting) ho\u1eb7c t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u (database).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea3m nh\u1eadn t\u1ea5t c\u1ea3 c\u00f4ng vi\u1ec7c c\u1ee7a Frontend Developer l\u1eabn Backend Developer nh\u01b0 thi\u1ebft k\u1ebf UX\/UI, qu\u1ea3n l\u00fd v\u00e0 tri\u1ec3n khai c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u00ednh ch\u1ea5t<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c d\u1ef1 \u00e1n nh\u1ecf ho\u1eb7c d\u1ef1 \u00e1n c\u00f3 tr\u1ecdng t\u00e2m r\u00f5 r\u00e0ng v\u1ec1 Frontend ho\u1eb7c Backend.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u00fd t\u01b0\u1edfng cho c\u00e1c d\u1ef1 \u00e1n ph\u1ee9c t\u1ea1p, \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft to\u00e0n di\u1ec7n v\u1ec1 c\u1ea3 l\u1eadp tr\u00ecnh Frontend l\u1eabn Backend.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <strong>Ph\u1ecfng v\u1ea5n \u0111\u1ed9c quy\u1ec1n ITviec x Toidicodedao:<\/strong> <a href=\"https:\/\/itviec.com\/blog\/3-loi-ich-cho-su-nghiep-khi-lam-full-stack-developer-2\/\" target=\"_blank\" rel=\"noopener\"><strong>C\u00f4ng vi\u1ec7c c\u1ee7a Full Stack Developer c\u00f3 g\u00ec kh\u00e1c?<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>Nh\u1eefng l\u1ee3i \u00edch b\u1ed5 sung c\u1ee7a HTTP\/2 so v\u1edbi HTTP 1.1 l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\"><b><\/b>So v\u1edbi HTTP 1.1, HTTP\/2 c\u00f3 nh\u1eefng \u01b0u \u0111i\u1ec3m \u0111\u00e1ng ch\u00fa \u00fd nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n: HTTP\/2 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 t\u1ea3i trang v\u00e0 gi\u1ea3m th\u1eddi gian kh\u1ee9 h\u1ed3i (RTT) cho c\u00e1c trang web s\u1eed d\u1ee5ng nhi\u1ec1u t\u00e0i nguy\u00ean.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gh\u00e9p k\u00eanh: Cho ph\u00e9p g\u1eedi nhi\u1ec1u y\u00eau c\u1ea7u \u0111\u1ed3ng th\u1eddi qua m\u1ed9t k\u1ebft n\u1ed1i TCP, lo\u1ea1i b\u1ecf vi\u1ec7c ch\u1eb7n \u0111\u1ea7u d\u00f2ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">X\u1eed l\u00fd nhi\u1ec1u t\u00e0i nguy\u00ean: HTTP\/2 qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 nhi\u1ec1u lo\u1ea1i t\u00e0i nguy\u00ean (t\u1eadp l\u1ec7nh, ph\u00f4ng ch\u1eef, h\u00ecnh \u1ea3nh) h\u01a1n so v\u1edbi HTTP\/1.1, \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u web hi\u1ec7n \u0111\u1ea1i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Giao th\u1ee9c nh\u1ecb ph\u00e2n: S\u1eed d\u1ee5ng giao th\u1ee9c nh\u1ecb ph\u00e2n thay v\u00ec giao th\u1ee9c v\u0103n b\u1ea3n, ti\u00eau t\u1ed1n \u00edt b\u0103ng th\u00f4ng h\u01a1n, d\u1ec5 ph\u00e2n t\u00edch c\u00fa ph\u00e1p h\u01a1n v\u00e0 \u00edt x\u1ea3y ra l\u1ed7i h\u01a1n giao th\u1ee9c v\u0103n b\u1ea3n c\u1ee7a HTTP\/1.1.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lo\u1ea1i b\u1ecf c\u00e1c v\u1ea5n \u0111\u1ec1 b\u1ea3o m\u1eadt li\u00ean quan \u0111\u1ebfn HTTP 1.1, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1ea5n c\u00f4ng ph\u00e2n t\u00e1ch ph\u1ea3n h\u1ed3i<\/span><\/li>\n<\/ul>\n<h3><b>H\u00e3y cho bi\u1ebft \u0111i\u1ec3m kh\u00e1c bi\u1ec7t gi\u1eefa HTML v\u00e0 XHTML?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec3m kh\u00e1c nhau c\u01a1 b\u1ea3n gi\u1eefa HTML v\u00e0 XHTML nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>T\u00ednh n\u0103ng<\/b><\/td>\n<td><b>HTML<\/b><\/td>\n<td><b>XHTML<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>C\u00fa ph\u00e1p th\u1ebb<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng ch\u1eef hoa ho\u1eb7c ch\u1eef th\u01b0\u1eddng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ea3i \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng ch\u1eef th\u01b0\u1eddng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Lo\u1ea1i t\u00e0i li\u1ec7u<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i y\u00eau c\u1ea7u khai b\u00e1o DOCTYPE.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u khai b\u00e1o DOCTYPE, th\u01b0\u1eddng \u1edf \u0111\u1ea7u t\u00e0i li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ph\u00e2n t\u00edch c\u00fa ph\u00e1p<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Tr\u00ecnh ph\u00e2n t\u00edch c\u00fa ph\u00e1p th\u01b0\u1eddng d\u1ec5 h\u01a1n v\u00e0 x\u1eed l\u00fd l\u1ed7i t\u1ed1t h\u01a1n.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tr\u00ecnh ph\u00e2n t\u00edch c\u00fa ph\u00e1p nghi\u00eam ng\u1eb7t h\u01a1n so v\u1edbi HTML v\u00e0 s\u1ebd t\u1ea1o ra l\u1ed7i n\u1ebfu t\u00e0i li\u1ec7u kh\u00f4ng tu\u00e2n th\u1ee7 c\u00e1c quy t\u1eafc \u0111\u00e3 \u0111\u1eb7t ra.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Namespace<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng h\u1ed7 tr\u1ee3 namespace XML.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 namespace XML, cho ph\u00e9p t\u00edch h\u1ee3p t\u1ed1t h\u01a1n v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 d\u1ef1a tr\u00ean XML kh\u00e1c.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Th\u1ebb t\u1ef1 \u0111\u00f3ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Cho ph\u00e9p vi\u1ebft c\u00e1c th\u1ebb t\u1ef1 \u0111\u00f3ng m\u00e0 kh\u00f4ng c\u1ea7n d\u1ea5u g\u1ea1ch ch\u00e9o \u0111\u00f3ng (VD &lt;br&gt;).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u c\u00e1c th\u1ebb t\u1ef1 \u0111\u00f3ng ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00f3ng b\u1eb1ng d\u1ea5u g\u1ea1ch ch\u00e9o (VD &lt;br\/&gt;).<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>SOAP v\u00e0 REST c\u00f3 nh\u1eefng \u0111i\u1ec3m g\u00ec kh\u00e1c nhau?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa SOAP v\u00e0 REST \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua 3 \u00fd ch\u00ednh sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>SOAP<\/b><\/td>\n<td><b>REST<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Giao th\u1ee9c (protocol)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ki\u1ebfn tr\u00fac \/ Phong c\u00e1ch thi\u1ebft k\u1ebf (architectural style)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ho\u1ea1t \u0111\u1ed9ng v\u1edbi XML<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 nhi\u1ec1u \u0111\u1ecbnh d\u1ea1ng: XML, JSON, HTML, v\u0103n b\u1ea3n thu\u1ea7n t\u00fay<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng REST<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng SOAP<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 \u0111\u1ed9 ph\u1ee9c t\u1ea1p cao<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 s\u1eed d\u1ee5ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u00f2i h\u1ecfi nhi\u1ec1u b\u0103ng th\u00f4ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ti\u1ebft ki\u1ec7m b\u0103ng th\u00f4ng<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa SVG v\u00e0 Canvas l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">SVG v\u00e0 Canvas l\u00e0 hai th\u00e0nh ph\u1ea7n \u0111\u1ed3 h\u1ecda trong HTML5 gi\u00fap t\u0103ng s\u1ee9c h\u1ea5p d\u1eabn v\u1ec1 m\u1eb7t \u0111\u1ed3 h\u1ecda cho trang web. \u0110i\u1ec3m kh\u00e1c nhau c\u1ee7a SVG v\u00e0 Canvas \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua 4 ti\u00eau ch\u00ed c\u01a1 b\u1ea3n g\u1ed3m: Type (lo\u1ea1i), Scalability (Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng), Modification (Kh\u1ea3 n\u0103ng s\u1eeda \u0111\u1ed5i), Performance (Hi\u1ec7u su\u1ea5t).<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>SVG (th\u1ebb &lt;svg&gt;)<\/b><\/td>\n<td><b>Canvas (th\u1ebb &lt;canvas&gt;<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Lo\u1ea1i<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ed3 h\u1ecda vector<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ed3 h\u1ecda raster (d\u1ef1a tr\u00ean pixel)<\/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;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng cao m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng, ph\u00f9 h\u1ee3p cho vi\u1ec7c in c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 in \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao do pixel h\u00f3a.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng s\u1eeda \u0111\u1ed5i<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i b\u1eb1ng CSS v\u00e0 t\u1eadp l\u1ec7nh.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i th\u00f4ng qua t\u1eadp l\u1ec7nh.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Hi\u1ec7u su\u1ea5t<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ho\u1ea1t \u0111\u1ed9ng t\u1ed1t v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng k\u1ebft xu\u1ea5t quy m\u00f4 nh\u1ecf (\u0111\u1ed1i t\u01b0\u1ee3ng d\u01b0\u1edbi 10.000).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ho\u1ea1t \u0111\u1ed9ng t\u1ed1t h\u01a1n v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng k\u1ebft xu\u1ea5t quy m\u00f4 l\u1edbn (nhi\u1ec1u h\u01a1n 10.000 \u0111\u1ed1i t\u01b0\u1ee3ng).<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Type Coercion trong JavaScript l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Type Coercion trong JavaScript l\u00e0 qu\u00e1 tr\u00ecnh t\u1ef1 \u0111\u1ed9ng ho\u1eb7c ng\u1ea7m \u0111\u1ecbnh chuy\u1ec3n \u0111\u1ed5i gi\u00e1 tr\u1ecb t\u1eeb ki\u1ec3u d\u1eef li\u1ec7u n\u00e0y sang ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c. V\u00ed d\u1ee5, m\u1ed9t chu\u1ed7i ho\u1eb7c gi\u00e1 tr\u1ecb boolean c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh s\u1ed1 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t s\u1ed1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh chu\u1ed7i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 hai lo\u1ea1i Type Coercion:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3u r\u00f5 r\u00e0ng (Explicit Type Coercion)<\/b><span style=\"font-weight: 400;\">: Khi l\u1eadp tr\u00ecnh vi\u00ean ch\u1ee7 \u0111\u1ed9ng chuy\u1ec3n \u0111\u1ed5i ki\u1ec3u d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch vi\u1ebft code c\u1ee5 th\u1ec3. V\u00ed d\u1ee5, s\u1eed d\u1ee5ng h\u00e0m Number(value) \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i m\u1ed9t gi\u00e1 tr\u1ecb th\u00e0nh s\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3u ng\u1ea7m \u0111\u1ecbnh (Implicit Type Coercion): <\/b><span style=\"font-weight: 400;\">Khi JavaScript t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n \u0111\u1ed5i ki\u1ec3u d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n l\u1eadp tr\u00ecnh vi\u00ean y\u00eau c\u1ea7u, th\u01b0\u1eddng x\u1ea3y ra trong c\u00e1c ph\u00e9p to\u00e1n.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Type Coercion gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean tr\u00e1nh l\u1ed7i kh\u00f4ng mong mu\u1ed1n khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau. Vi\u1ec7c s\u1eed d\u1ee5ng to\u00e1n t\u1eed <\/span><span style=\"font-weight: 400;\">===<\/span><span style=\"font-weight: 400;\"> (so s\u00e1nh nghi\u00eam ng\u1eb7t) gi\u00fap tr\u00e1nh c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 type coercion.<\/span><\/p>\n<h3><b>Trong l\u1eadp tr\u00ecnh web, m\u00e1y ch\u1ee7 web c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u00e1y ch\u1ee7 web (web server) l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m cung c\u1ea5p n\u1ed9i dung web cho ng\u01b0\u1eddi d\u00f9ng v\u00e0 l\u01b0u tr\u1eef c\u00e1c trang web. N\u00f3 x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u t\u1eeb tr\u00ecnh duy\u1ec7t web v\u00e0 ph\u1ee5c v\u1ee5 c\u00e1c t\u00e0i nguy\u00ean nh\u01b0 t\u1ec7p v\u00e0 trang web qua internet.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u1ec1 ph\u1ea7n c\u1ee9ng, m\u00e1y ch\u1ee7 web c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i d\u01b0\u1edbi d\u1ea1ng m\u00e1y \u1ea3o tr\u00ean \u0111\u00e1m m\u00e2y ho\u1eb7c d\u01b0\u1edbi d\u1ea1ng m\u00e1y v\u1eadt l\u00fd trong trung t\u00e2m d\u1eef li\u1ec7u. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 t\u00e0i nguy\u00ean c\u1ee7a m\u00e1y ch\u1ee7 web ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c v\u00e0 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp d\u1ef1 ki\u1ebfn. Trong khi \u0111\u00f3, ph\u1ea7n m\u1ec1m m\u00e1y ch\u1ee7 web ho\u1ea1t \u0111\u1ed9ng tr\u00ean n\u1ec1n t\u1ea3ng \u0111\u00e1m m\u00e2y ho\u1eb7c m\u00e1y ch\u1ee7 v\u1eadt l\u00fd, x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u \u0111\u1ebfn tr\u00ean c\u00e1c c\u1ed5ng c\u1ee5 th\u1ec3 \u0111\u1ec3 ph\u00e2n ph\u1ed1i n\u1ed9i dung.<\/span><\/p>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa \u0111\u1ed1i t\u01b0\u1ee3ng localStorage v\u00e0 sessionStorage l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Session Storage v\u00e0 Local Storage l\u00e0 hai lo\u1ea1i l\u01b0u tr\u1eef web \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn. Trong \u0111\u00f3, Session Storage s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng window.sessionStorage \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u cho m\u1ed9t phi\u00ean duy nh\u1ea5t. D\u1eef li\u1ec7u s\u1ebd b\u1ecb x\u00f3a khi \u0111\u00f3ng tr\u00ecnh duy\u1ec7t.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ng\u01b0\u1ee3c l\u1ea1i, Local Storage (B\u1ed9 nh\u1edb c\u1ee5c b\u1ed9) s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng window.localStorage \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u00f3 ng\u00e0y h\u1ebft h\u1ea1n. D\u1eef li\u1ec7u c\u00f3 s\u1eb5n v\u1eabn c\u00f2n ngay c\u1ea3 sau khi \u0111\u00f3ng v\u00e0 m\u1edf l\u1ea1i tr\u00ecnh duy\u1ec7t.<\/span><\/p>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa Android Developer v\u00e0 Web Developer l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Android l\u00e0 m\u1ed9t h\u1ec7 \u0111i\u1ec1u h\u00e0nh (Operating System) d\u00e0nh cho thi\u1ebft b\u1ecb di \u0111\u1ed9ng \u0111\u01b0\u1ee3c Google ph\u00e1t tri\u1ec3n. Android l\u00e0 m\u00e3 ngu\u1ed3n m\u1edf, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i v\u00e0 t\u00f9y ch\u1ec9nh Android \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng d\u00f2ng \u0111i\u1ec7n tho\u1ea1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Web app l\u00e0 ph\u1ea7n m\u1ec1m \u1ee9ng d\u1ee5ng l\u01b0u tr\u1eef tr\u00ean m\u00e1y ch\u1ee7 t\u1eeb xa, th\u1ef1c hi\u1ec7n c\u00e1c ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 theo y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng. D\u1ef1a tr\u00ean m\u00f4 h\u00ecnh client-server, web app truy c\u1eadp qua tr\u00ecnh duy\u1ec7t web v\u00e0 k\u1ebft n\u1ed1i internet. Ng\u01b0\u1eddi x\u00e2y d\u1ef1ng web app \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Web Developer, ch\u1ecbu tr\u00e1ch nhi\u1ec7m ph\u00e1t tri\u1ec3n website ho\u1eb7c \u1ee9ng d\u1ee5ng web.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec3m kh\u00e1c bi\u1ec7t gi\u1eefa Android Developer v\u00e0 Web Developer v\u1ec1 c\u01a1 b\u1ea3n nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Android Developer\u00a0<\/b><\/td>\n<td><b>Web Developer<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Ch\u1ee9c danh c\u00f4ng vi\u1ec7c<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chuy\u00ean gia c\u00f4ng ngh\u1ec7 th\u00f4ng tin ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng cho thi\u1ebft b\u1ecb Android.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Chuy\u00ean gia c\u00f4ng ngh\u1ec7 th\u00f4ng tin ph\u00e1t tri\u1ec3n trang web ho\u1eb7c \u1ee9ng d\u1ee5ng web.\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>L\u0129nh v\u1ef1c l\u00e0m vi\u1ec7c<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 x\u00e2y d\u1ef1ng \u1ee9ng d\u1ee5ng cho n\u1ec1n t\u1ea3ng Android<\/span><\/td>\n<td><span style=\"font-weight: 400;\">X\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng d\u00e0nh ri\u00eang cho n\u1ec1n t\u1ea3ng \u0111\u00f3<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng truy c\u1eadp<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp b\u1eb1ng thi\u1ebft b\u1ecb Android v\u00e0 c\u00f3 ho\u1eb7c kh\u00f4ng c\u00f3 y\u00eau c\u1ea7u v\u1ec1 Internet.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp b\u1eb1ng b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb k\u1ef9 thu\u1eadt s\u1ed1 n\u00e0o th\u00f4ng qua tr\u00ecnh duy\u1ec7t v\u00e0 k\u1ebft n\u1ed1i internet \u0111ang ho\u1ea1t \u0111\u1ed9ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ecb h\u1ea1n ch\u1ebf v\u00ec ch\u1ec9 ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng cho n\u1ec1n t\u1ea3ng Android.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng gi\u1edbi h\u1ea1n \u1edf b\u1ea5t k\u1ef3 n\u1ec1n t\u1ea3ng n\u00e0o v\u00ec s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 truy c\u1eadp c\u00e1c \u1ee9ng d\u1ee5ng web qua Internet.<\/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;\">Kh\u00f3 h\u1ecdc v\u00e0 kh\u00f3 b\u1eaft \u0111\u1ea7u h\u01a1n so v\u1edbi ph\u00e1t tri\u1ec3n web<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 h\u1ecdc v\u00e0 d\u1ec5 b\u1eaft \u0111\u1ea7u h\u01a1n so v\u1edbi ph\u00e1t tri\u1ec3n Android.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ki\u1ebfn th\u1ee9c c\u1ea7n c\u00f3<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 Java, Kotlin, C\/C++, XML, Android Studio IDE, ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 API,&#8230;<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 PHP, Java, Python, HTML, CSS, JavaScript, web framework, ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 nhi\u1ec1u c\u01a1 s\u1edf d\u1eef li\u1ec7u,&#8230;<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn<\/b><\/td>\n<td><span style=\"font-weight: 400;\">WhatsApp, Facebook, Flipkart, Swiggy,&#8230;<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Amazon, Facebook, Yahoo, GeeksforGeeks,&#8230;<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/android-developer\/\" target=\"_blank\" rel=\"noopener\"><strong>Android Developer l\u00e0 l\u00e0m g\u00ec? L\u01b0\u01a1ng h\u1ea5p d\u1eabn \u0111\u1ebfn th\u1ebf n\u00e0o?<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>WYSIWYG l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a t\u1eeb g\u00ec v\u00e0 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o trong l\u1eadp tr\u00ecnh web?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">WYSIWYG l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a \u201cWhat You See Is What You Get\u201d &#8211; m\u1ed9t c\u1ee5m t\u1eeb th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ch\u1ec9 c\u00e1c c\u00f4ng c\u1ee5 thi\u1ebft k\u1ebf web cho ph\u00e9p t\u1ea1o trang web m\u1ed9t c\u00e1ch tr\u1ef1c quan.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tr\u00ecnh ch\u1ec9nh s\u1eeda WYSIWYG cho bi\u1ebft c\u00e1c th\u00e0nh ph\u1ea7n web s\u1ebd hi\u1ec3n th\u1ecb nh\u01b0 th\u1ebf n\u00e0o v\u1edbi ng\u01b0\u1eddi d\u00f9ng khi l\u1eadp tr\u00ecnh vi\u00ean ch\u1ec9nh s\u1eeda. Tr\u1ea3i nghi\u1ec7m ch\u1ec9nh s\u1eeda n\u00e0y gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian. Ngo\u00e0i ra, nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng ph\u1ea3i l\u00e0 l\u1eadp tr\u00ecnh vi\u00ean c\u0169ng c\u00f3 th\u1ec3 t\u1ea1o ra n\u1ed9i dung c\u00f3 giao di\u1ec7n chuy\u00ean nghi\u1ec7p m\u00e0 kh\u00f4ng c\u1ea7n t\u1ed1n nhi\u1ec1u c\u00f4ng s\u1ee9c vi\u1ebft code.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Web_Developer_danh_cho_Middle_Web_Developer\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Middle Web Developer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Git c\u00f3 t\u1ea7m quan tr\u1ecdng nh\u01b0 th\u1ebf n\u00e0o trong l\u1eadp tr\u00ecnh web?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong l\u1eadp tr\u00ecnh web, Git l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 r\u1ea5t quan tr\u1ecdng. Git gi\u00fap c\u00e1c c\u00f4ng t\u00e1c l\u00e0m vi\u1ec7c nh\u00f3m c\u1ee7a c\u00e1c Web Developer tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n th\u00f4ng qua vi\u1ec7c theo d\u00f5i nh\u1eefng thay \u0111\u1ed5i tr\u00ean code \u0111\u1ec3 tr\u00e1nh ghi \u0111\u00e8 l\u00ean nhau.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, Git c\u00f2n cho ph\u00e9p h\u1ee3p nh\u1ea5t code, qu\u1ea3n l\u00fd l\u1ecbch s\u1eed phi\u00ean b\u1ea3n v\u00e0 \u0111\u1ea3m b\u1ea3o c\u1ed9ng t\u00e1c hi\u1ec7u qu\u1ea3 gi\u1eefa c\u00e1c nh\u00f3m ph\u00e2n t\u00e1n.\u00a0<\/span><\/p>\n<h3><b>Cho bi\u1ebft l\u1ee3i \u00edch c\u1ee7a c\u00e1c m\u00f4-\u0111un JavaScript v\u1edbi c\u00e1c t\u1eadp l\u1ec7nh truy\u1ec1n th\u1ed1ng<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c m\u00f4-\u0111un (modules) JavaScript l\u00e0 c\u00e1c t\u1ec7p code c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng, cho ph\u00e9p Web Developer nh\u1eadp v\u00e0 xu\u1ea5t c\u00e1c ch\u1ee9c n\u0103ng b\u1eb1ng c\u00fa ph\u00e1p c\u1ee5 th\u1ec3. Ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn theo m\u00f4-\u0111un n\u00e0y gi\u00fap vi\u1ec7c l\u1eadp tr\u00ecnh v\u00e0 ph\u00e1t tri\u1ec3n web tr\u1edf n\u00ean nhanh ch\u00f3ng, ti\u1ec7n l\u1ee3i h\u01a1n so v\u1edbi c\u00e1c t\u1eadp l\u1ec7nh \u0111\u01a1n kh\u1ed1i truy\u1ec1n th\u1ed1ng.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n l\u00fd namespace:<\/b><span style=\"font-weight: 400;\"> C\u00e1c m\u00f4-\u0111un \u0111\u00f3ng g\u00f3i code trong ph\u1ea1m vi c\u1ee5c b\u1ed9, gi\u1ea3m xung \u0111\u1ed9t t\u00ean v\u00e0 gi\u1ea3m thi\u1ec3u \u00f4 nhi\u1ec5m kh\u00f4ng gian t\u00ean to\u00e0n c\u1ee5c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng:<\/b><span style=\"font-weight: 400;\"> C\u00e1c bi\u1ebfn, l\u1edbp ho\u1eb7c h\u00e0m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00e1i s\u1eed d\u1ee5ng tr\u00ean c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a \u1ee9ng d\u1ee5ng, th\u00fac \u0111\u1ea9y nguy\u00ean t\u1eafc DRY (Kh\u00f4ng l\u1eb7p l\u1ea1i ch\u00ednh m\u00ecnh).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec: <\/b><span style=\"font-weight: 400;\">Chia code th\u00e0nh c\u00e1c m\u00f4-\u0111un nh\u1ecf h\u01a1n, c\u00f3 ch\u1ee9c n\u0103ng gi\u00fap g\u1ee1 l\u1ed7i, b\u1ea3o tr\u00ec v\u00e0 hi\u1ec3u d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n l\u00fd ph\u1ee5 thu\u1ed9c:<\/b><span style=\"font-weight: 400;\"> C\u00e1c c\u00e2u l\u1ec7nh nh\u1eadp v\u00e0 xu\u1ea5t x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng c\u00e1c ph\u1ee5 thu\u1ed9c, cho ph\u00e9p theo d\u00f5i v\u00e0 qu\u1ea3n l\u00fd d\u1ec5 d\u00e0ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t: <\/b><span style=\"font-weight: 400;\">C\u00e1c c\u00f4ng c\u1ee5 x\u00e2y d\u1ef1ng JavaScript hi\u1ec7n \u0111\u1ea1i t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c t\u1ea3i m\u00f4-\u0111un, cho ph\u00e9p c\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 tree shaking \u0111\u1ec3 lo\u1ea1i b\u1ecf code kh\u00f4ng s\u1eed d\u1ee5ng v\u00e0 n\u00e2ng cao hi\u1ec7u su\u1ea5t \u1ee9ng d\u1ee5ng web.<\/span><\/li>\n<\/ul>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa CMS, DNS, hosting, FTP l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CMS l\u00e0 h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd n\u1ed9i dung, cho ph\u00e9p b\u1ea1n d\u1ec5 d\u00e0ng t\u1ea1o, ch\u1ec9nh s\u1eeda v\u00e0 qu\u1ea3n l\u00fd n\u1ed9i dung tr\u00ean m\u1ed9t website m\u00e0 kh\u00f4ng c\u1ea7n vi\u1ebft m\u00e3 ph\u1ee9c t\u1ea1p. V\u00ed d\u1ee5: WordPress, Joomla, Drupal.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">DNS l\u00e0 h\u1ec7 th\u1ed1ng ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n (v\u00ed d\u1ee5: example.com) th\u00e0nh \u0111\u1ecba ch\u1ec9 IP (v\u00ed d\u1ee5: 192.168.1.1) m\u00e0 m\u00e1y t\u00ednh s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb m\u00e1y ch\u1ee7 tr\u00ean internet.\u00a0 V\u00ed d\u1ee5: Khi b\u1ea1n g\u00f5 google.com, DNS s\u1ebd gi\u00fap tr\u00ecnh duy\u1ec7t t\u00ecm \u0111\u1ebfn \u0111\u00fang m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef Google.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hosting l\u00e0 n\u01a1i l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 c\u00e1c t\u1ec7p c\u1ee7a website tr\u00ean m\u00e1y ch\u1ee7 (server), gi\u00fap website c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb internet. C\u00e1c lo\u1ea1i Hosting: Shared Hosting, VPS, Dedicated Server, Cloud Hosting.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">FTP l\u00e0 giao th\u1ee9c truy\u1ec1n t\u1ec7p tin gi\u1eefa m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n v\u00e0 m\u00e1y ch\u1ee7 hosting. V\u00ed d\u1ee5: D\u00f9ng FTP \u0111\u1ec3 t\u1ea3i t\u1ec7p m\u00e3 ngu\u1ed3n website t\u1eeb m\u00e1y t\u00ednh l\u00ean server ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i. C\u00f4ng c\u1ee5 FTP ph\u1ed5 bi\u1ebfn: FileZilla, Cyberduck.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa CMS (Content Management System), DNS (Domain Name System), Hosting v\u00e0 FTP (File Transfer Protocol) \u0111\u01b0\u1ee3c t\u00f3m t\u1eaft nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><\/td>\n<td><b>Ch\u1ee9c n\u0103ng ch\u00ednh<\/b><\/td>\n<td><b>Ng\u01b0\u1eddi d\u00f9ng<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>CMS<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Cung c\u1ea5p giao di\u1ec7n tr\u1ef1c quan \u0111\u1ec3 th\u00eam b\u00e0i vi\u1ebft, h\u00ecnh \u1ea3nh, video.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; T\u00edch h\u1ee3p c\u00e1c plugin, giao di\u1ec7n \u0111\u1ec3 m\u1edf r\u1ed9ng t\u00ednh n\u0103ng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u01b0\u1eddi qu\u1ea3n l\u00fd n\u1ed9i dung ho\u1eb7c qu\u1ea3n tr\u1ecb vi\u00ean website mu\u1ed1n qu\u1ea3n l\u00fd website m\u00e0 kh\u00f4ng c\u1ea7n ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh s\u00e2u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>DNS<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Qu\u1ea3n l\u00fd c\u00e1c b\u1ea3n ghi t\u00ean mi\u1ec1n (A, CNAME, MX, TXT&#8230;).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; K\u1ebft n\u1ed1i t\u00ean mi\u1ec1n v\u1edbi hosting ho\u1eb7c d\u1ecbch v\u1ee5 email.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng ho\u1eb7c l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n c\u1ea5u h\u00ecnh t\u00ean mi\u1ec1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Hosting<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; L\u01b0u tr\u1eef m\u00e3 ngu\u1ed3n, h\u00ecnh \u1ea3nh, video, c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a website.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Cung c\u1ea5p t\u00e0i nguy\u00ean (b\u0103ng th\u00f4ng, CPU, RAM) \u0111\u1ec3 website ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ee7 s\u1edf h\u1eefu website c\u1ea7n kh\u00f4ng gian l\u01b0u tr\u1eef \u0111\u1ec3 website ho\u1ea1t \u0111\u1ed9ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>FTP<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Truy c\u1eadp v\u00e0 qu\u1ea3n l\u00fd t\u1ec7p tin tr\u00ean m\u00e1y ch\u1ee7 t\u1eeb xa.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; H\u1ed7 tr\u1ee3 t\u1ea3i l\u00ean ho\u1eb7c t\u1ea3i xu\u1ed1ng d\u1eef li\u1ec7u nhanh ch\u00f3ng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u1eadp tr\u00ecnh vi\u00ean ho\u1eb7c qu\u1ea3n tr\u1ecb vi\u00ean c\u1ea7n ch\u1ec9nh s\u1eeda, c\u1eadp nh\u1eadt t\u1ec7p tin tr\u1ef1c ti\u1ebfp tr\u00ean m\u00e1y ch\u1ee7.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u1ee3i \u00edch c\u1ee7a quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean BEM trong CSS l\u00e0 g\u00ec?<\/b><\/h3>\n<p><b>BEM<\/b><span style=\"font-weight: 400;\"> (Block, Element, Modifier) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p lu\u1eadn d\u00f9ng \u0111\u1ec3 \u0111\u1eb7t t\u00ean l\u1edbp CSS m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng, c\u00f3 c\u1ea5u tr\u00fac, gi\u00fap qu\u1ea3n l\u00fd v\u00e0 t\u00e1i s\u1eed d\u1ee5ng m\u00e3 CSS d\u1ec5 d\u00e0ng h\u01a1n trong c\u00e1c d\u1ef1 \u00e1n ph\u00e1t tri\u1ec3n giao di\u1ec7n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BEM \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn l\u00e0 nh\u1edd nh\u1eefng \u01b0u \u0111i\u1ec3m sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">X\u00e1c \u0111\u1ecbnh r\u00f5 ki\u1ec3u CSS n\u00e0o \u00e1p d\u1ee5ng cho ph\u1ea7n n\u00e0o c\u1ee7a HTML, gi\u00fap d\u1ec5 hi\u1ec3u v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khuy\u1ebfn kh\u00edch s\u1eed d\u1ee5ng c\u00e1c kh\u1ed1i m\u00e3 c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng, c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u00e1i s\u1eed d\u1ee5ng \u1edf nhi\u1ec1u ph\u1ea7n kh\u00e1c nhau c\u1ee7a trang web ho\u1eb7c \u1ee9ng d\u1ee5ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n tr\u00ean c\u01a1 s\u1edf m\u00e3 l\u1edbn, gi\u00fap m\u1edf r\u1ed9ng quy m\u00f4 v\u00e0 duy tr\u00ec c\u00e1c d\u1ef1 \u00e1n l\u1edbn d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cho ph\u00e9p web developer t\u00e1ch bi\u1ec7t ph\u1ea7n tr\u00ecnh b\u00e0y v\u00e0 h\u00e0nh vi c\u1ee7a m\u1ed9t th\u00e0nh ph\u1ea7n, t\u1eeb \u0111\u00f3 d\u1ec5 d\u00e0ng thay \u0111\u1ed5i giao di\u1ec7n c\u1ee7a th\u00e0nh ph\u1ea7n m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ee9c n\u0103ng c\u1ee7a n\u00f3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cung c\u1ea5p kh\u00f4ng gian t\u00ean r\u00f5 r\u00e0ng cho t\u1eebng ph\u1ea7n t\u1eed v\u00e0 tr\u00ecnh s\u1eeda \u0111\u1ed5i, ng\u0103n ng\u1eeba xung \u0111\u1ed9t t\u00ean.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Code CSS vi\u1ebft theo BEM th\u01b0\u1eddng d\u1ec5 \u0111\u1ecdc v\u00e0 hi\u1ec3u h\u01a1n so v\u1edbi code s\u1eed d\u1ee5ng c\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean t\u00f9y \u00fd.<\/span><\/li>\n<\/ul>\n<h3><b>K\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7 hay SSR c\u00f3 l\u1ee3i \u00edch g\u00ec cho SEO?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">\u00a0K\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn SEO v\u00ec m\u1ed9t s\u1ed1 l\u00fd do:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u200dC\u1ea3i thi\u1ec7n ch\u1ec9 m\u1ee5c: <\/b><span style=\"font-weight: 400;\">Cho ph\u00e9p c\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm l\u1eadp ch\u1ec9 m\u1ee5c v\u00e0 hi\u1ec3u n\u1ed9i dung c\u1ee7a trang web t\u1ed1t h\u01a1n.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Th\u1eddi gian t\u1ea3i nhanh h\u01a1n: <\/b><span style=\"font-weight: 400;\">C\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm s\u1eed d\u1ee5ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang l\u00e0m y\u1ebfu t\u1ed1 x\u1ebfp h\u1ea1ng. Do \u0111\u00f3, trang web t\u1ea3i nhanh h\u01a1n c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c x\u1ebfp h\u1ea1ng cao h\u01a1n trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng t\u1ed1t h\u01a1n<\/b><span style=\"font-weight: 400;\">: V\u1edbi k\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7, trang \u0111\u00e3 \u0111\u01b0\u1ee3c k\u1ebft xu\u1ea5t \u0111\u1ea7y \u0111\u1ee7 khi tr\u00ecnh duy\u1ec7t c\u1ee7a m\u00e1y kh\u00e1ch nh\u1eadn \u0111\u01b0\u1ee3c, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m m\u01b0\u1ee3t m\u00e0 v\u00e0 li\u1ec1n m\u1ea1ch h\u01a1n cho ng\u01b0\u1eddi d\u00f9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng thu th\u1eadp d\u1eef li\u1ec7u t\u1ed1t h\u01a1n: <\/b><span style=\"font-weight: 400;\">V\u1edbi k\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7, t\u1ea5t c\u1ea3 c\u00e1c li\u00ean k\u1ebft tr\u00ean trang \u0111\u1ec1u c\u00f3 trong HTML, gi\u00fap c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm d\u1ec5 d\u00e0ng thu th\u1eadp d\u1eef li\u1ec7u v\u00e0 l\u1eadp ch\u1ec9 m\u1ee5c n\u1ed9i dung c\u1ee7a trang web.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u1ea3m tr\u00f9ng l\u1eb7p<\/b><span style=\"font-weight: 400;\">: K\u1ebft xu\u1ea5t ph\u00eda m\u00e1y ch\u1ee7 c\u0169ng c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m tr\u00f9ng l\u1eb7p n\u1ed9i dung b\u1edfi n\u1ed9i dung ch\u1ec9 c\u00f3 tr\u00ean m\u1ed9t URL duy nh\u1ea5t.<\/span><\/li>\n<\/ul>\n<h3><b>Khi mu\u1ed1n di chuy\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u, b\u1ea1n s\u1ebd l\u00e0m th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">X\u1eed l\u00fd di chuy\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn vi\u1ec7c qu\u1ea3n l\u00fd c\u00e1c thay \u0111\u1ed5i \u0111\u1ed1i v\u1edbi l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 \u0111i\u1ec1u ch\u1ec9nh d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 cho ph\u00f9 h\u1ee3p. M\u1ed9t s\u1ed1 c\u00e1ch di chuy\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u00e0 c\u00e1c Web Developer hi\u1ec7n nay th\u01b0\u1eddng \u00e1p d\u1ee5ng nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng t\u1eadp l\u1ec7nh di chuy\u1ec3n:<\/b><span style=\"font-weight: 400;\"> T\u1ea1o c\u00e1c t\u1eadp l\u1ec7nh \u0111\u1ed9c l\u1eadp cho t\u1ea5t c\u1ea3 thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3, ch\u1eb3ng h\u1ea1n th\u00eam ch\u1ec9 m\u1ee5c, c\u1ed9t ho\u1eb7c b\u1ea3ng, \u0111\u1ea3m b\u1ea3o ch\u00fang c\u00f3 th\u1ec3 ch\u1ea1y nhi\u1ec1u l\u1ea7n m\u00e0 kh\u00f4ng c\u00f3 l\u1ed7i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n: <\/b><span style=\"font-weight: 400;\">Duy tr\u00ec c\u00e1c t\u1eadp l\u1ec7nh di chuy\u1ec3n trong ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n \u0111\u1ec3 theo d\u00f5i c\u00e1c thay \u0111\u1ed5i theo th\u1eddi gian.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3m tra di chuy\u1ec3n: <\/b><span style=\"font-weight: 400;\">\u00c1p d\u1ee5ng di chuy\u1ec3n trong m\u00f4i tr\u01b0\u1eddng d\u00e0n d\u1ef1ng ho\u1eb7c ph\u00e1t tri\u1ec3n tr\u01b0\u1edbc khi tri\u1ec3n khai ch\u00fang v\u00e0o s\u1ea3n xu\u1ea5t \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c s\u1ef1 c\u1ed1 ti\u1ec1m \u1ea9n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sao l\u01b0u tr\u01b0\u1edbc khi di chuy\u1ec3n:<\/b><span style=\"font-weight: 400;\"> Lu\u00f4n sao l\u01b0u c\u01a1 s\u1edf d\u1eef li\u1ec7u tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng di chuy\u1ec3n trong s\u1ea3n xu\u1ea5t \u0111\u1ec3 ng\u0103n ng\u1eeba m\u1ea5t d\u1eef li\u1ec7u trong tr\u01b0\u1eddng h\u1ee3p x\u1ea3y ra l\u1ed7i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u00e1m s\u00e1t v\u00e0 xem x\u00e9t: <\/b><span style=\"font-weight: 400;\">Sau khi \u00e1p d\u1ee5ng di chuy\u1ec3n, h\u00e3y theo d\u00f5i hi\u1ec7u su\u1ea5t c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 \u1ee9ng d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft m\u1ecdi t\u00e1c \u0111\u1ed9ng b\u1ea5t l\u1ee3i.<\/span><\/li>\n<\/ul>\n<h3><b>Gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m \u1ee8ng d\u1ee5ng web l\u0169y ti\u1ebfn (PWA) v\u00e0 nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a ch\u00fang<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Progressive Web App (PWA) s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 web \u0111\u1ec3 mang l\u1ea1i tr\u1ea3i nghi\u1ec7m t\u01b0\u01a1ng t\u1ef1 nh\u01b0 \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng. \u01afu \u0111i\u1ec3m c\u1ee7a PWA g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tr\u1ea3i nghi\u1ec7m gi\u1ed1ng nh\u01b0 \u1ee9ng d\u1ee5ng: <\/b><span style=\"font-weight: 400;\">PWA ph\u1ea3n h\u1ed3i v\u00e0 th\u00edch \u1ee9ng v\u1edbi c\u00e1c k\u00edch th\u01b0\u1edbc v\u00e0 h\u01b0\u1edbng m\u00e0n h\u00ecnh kh\u00e1c nhau. Ch\u00fang c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t tr\u00ean m\u00e0n h\u00ecnh ch\u00ednh c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, c\u00f3 giao di\u1ec7n gi\u1ed1ng nh\u01b0 \u1ee9ng d\u1ee5ng v\u1edbi ch\u1ebf \u0111\u1ed9 to\u00e0n m\u00e0n h\u00ecnh v\u00e0 h\u1ed7 tr\u1ee3 ch\u1ee9c n\u0103ng ngo\u1ea1i tuy\u1ebfn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1c \u0111\u1ed9 t\u1ea3i cao:<\/b><span style=\"font-weight: 400;\"> PWA \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ea3i nhanh, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp n\u1ed9i dung ngay l\u1eadp t\u1ee9c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Th\u00f4ng b\u00e1o \u0111\u1ea9y:<\/b><span style=\"font-weight: 400;\"> PWA c\u00f3 th\u1ec3 g\u1eedi th\u00f4ng b\u00e1o, gi\u1ed1ng nh\u01b0 \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng g\u1ed1c. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 ch\u1ecdn nh\u1eadn c\u1eadp nh\u1eadt, c\u1ea3nh b\u00e1o ho\u1eb7c c\u00e1c tin nh\u1eafn \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch \u0111a n\u1ec1n t\u1ea3ng: <\/b><span style=\"font-weight: 400;\">PWA ho\u1ea1t \u0111\u1ed9ng tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb v\u00e0 n\u1ec1n t\u1ea3ng, bao g\u1ed3m m\u00e1y t\u00ednh \u0111\u1ec3 b\u00e0n, m\u00e1y t\u00ednh b\u1ea3ng v\u00e0 thi\u1ebft b\u1ecb di \u0111\u1ed9ng.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1i \u01b0u h\u00f3a cho t\u00ecm ki\u1ebfm:<\/b><span style=\"font-weight: 400;\"> PWA \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 th\u00e2n thi\u1ec7n v\u1edbi c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm, gi\u00fap c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng x\u1ebfp h\u1ea1ng tr\u00ean c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng l\u00e0m vi\u1ec7c ngo\u1ea1i tuy\u1ebfn:<\/b><span style=\"font-weight: 400;\"> Ngo\u00e0i t\u1ed1c \u0111\u1ed9 t\u1ea3i nhanh, PWA c\u00f2n n\u1ed5i b\u1eadt \u1edf kh\u1ea3 n\u0103ng ho\u1ea1t \u0111\u1ed9ng ngo\u1ea1i tuy\u1ebfn. Nh\u1edd c\u01a1 ch\u1ebf cache, ng\u01b0\u1eddi d\u00f9ng v\u1eabn c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0 s\u1eed d\u1ee5ng \u1ee9ng d\u1ee5ng ngay c\u1ea3 khi kh\u00f4ng c\u00f3 k\u1ebft n\u1ed1i m\u1ea1ng.<\/span><\/li>\n<\/ul>\n<h3><b>T\u01b0\u1eddng l\u1eeda \u1ee9ng d\u1ee5ng web (WAF) l\u00e0 g\u00ec v\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi b\u1ea3o m\u1eadt web?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">WAF gi\u1ed1ng nh\u01b0 m\u1ed9t v\u1ec7 s\u0129 b\u1ea3o v\u1ec7 cho c\u00e1c \u1ee9ng d\u1ee5ng web kh\u1ecfi nhi\u1ec1u m\u1ed1i \u0111e d\u1ecda tr\u1ef1c tuy\u1ebfn kh\u00e1c nhau nh\u01b0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDoS v\u00e0 SQL injection. WAF \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng \u1ee9ng d\u1ee5ng web ph\u1ed5 bi\u1ebfn b\u1eb1ng c\u00e1ch ki\u1ec3m tra v\u00e0 l\u1ecdc c\u00e1c y\u00eau c\u1ea7u \u0111\u1ebfn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">H\u01a1n n\u1eefa, WAF li\u00ean t\u1ee5c theo d\u00f5i l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u1ee9ng d\u1ee5ng web v\u00e0 \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc b\u1ea3o m\u1eadt \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 ch\u1eb7n h\u00e0nh vi \u0111\u00e1ng ng\u1edd.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e1t hi\u1ec7n v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng:<\/b><span style=\"font-weight: 400;\"> SQL injection, XSS, CSRF, DDoS, brute-force,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3m tra v\u00e0 l\u1ecdc c\u00e1c y\u00eau c\u1ea7u:<\/b><span style=\"font-weight: 400;\"> Ki\u1ec3m tra t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a c\u00e1c tham s\u1ed1 \u0111\u1ea7u v\u00e0o, x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng, ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam m\u00e3 \u0111\u1ed9c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u00c1p d\u1ee5ng c\u00e1c quy t\u1eafc b\u1ea3o m\u1eadt:<\/b><span style=\"font-weight: 400;\"> Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n b\u1ea3o m\u1eadt nh\u01b0 OWASP Top 10, PCI DSS.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u00e1m s\u00e1t v\u00e0 b\u00e1o c\u00e1o:<\/b><span style=\"font-weight: 400;\"> Thu th\u1eadp d\u1eef li\u1ec7u v\u1ec1 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng, t\u1ea1o b\u00e1o c\u00e1o \u0111\u1ec3 ph\u00e2n t\u00edch v\u00e0 c\u1ea3i thi\u1ec7n b\u1ea3o m\u1eadt.<\/span><\/li>\n<\/ul>\n<h3><b>Trang web t\u0129nh v\u00e0 trang web \u0111\u1ed9ng c\u00f3 \u0111i\u1ec3m g\u00ec kh\u00e1c nhau?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trang web t\u0129nh hi\u1ec3n th\u1ecb n\u1ed9i dung cho t\u1ea5t c\u1ea3 ng\u01b0\u1eddi d\u00f9ng. N\u1ed9i dung tr\u00ean trang web s\u1ebd kh\u00f4ng thay \u0111\u1ed5i tr\u1eeb khi b\u1ea1n th\u1ef1c hi\u1ec7n c\u1eadp nh\u1eadt th\u1ee7 c\u00f4ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong khi \u0111\u00f3, trang web \u0111\u1ed9ng cung c\u1ea5p tr\u1ea3i nghi\u1ec7m thay \u0111\u1ed5i. C\u00e1c trang web n\u00e0y t\u1ea1o ho\u1eb7c thay \u0111\u1ed5i n\u1ed9i dung m\u00e0 kh\u00f4ng c\u1ea7n s\u1ef1 can thi\u1ec7p c\u1ee7a con ng\u01b0\u1eddi. Th\u00f4ng th\u01b0\u1eddng, trang web \u0111\u1ed9ng c\u00f3 th\u1ec3 cung c\u1ea5p tr\u1ea3i nghi\u1ec7m \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Web_Developer_danh_cho_Senior_Web_Developer\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer d\u00e0nh cho Senior Web Developer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>WebSockets l\u00e0 g\u00ec v\u00e0 ch\u00fang cho ph\u00e9p giao ti\u1ebfp th\u1eddi gian th\u1ef1c trong l\u1eadp tr\u00ecnh web nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">WebSockets l\u00e0 m\u1ed9t giao th\u1ee9c giao ti\u1ebfp cho ph\u00e9p giao ti\u1ebfp hai chi\u1ec1u th\u1eddi gian th\u1ef1c gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 qua m\u1ed9t k\u1ebft n\u1ed1i duy nh\u1ea5t. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c y\u00eau c\u1ea7u HTTP kh\u00e1c, l\u00e0 m\u1ed9t chi\u1ec1u v\u00e0 kh\u00f4ng c\u00f3 tr\u1ea1ng th\u00e1i, WebSockets thi\u1ebft l\u1eadp m\u1ed9t k\u1ebft n\u1ed1i li\u00ean t\u1ee5c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">WebSockets \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng web th\u1eddi gian th\u1ef1c. Ch\u00fang cho ph\u00e9p giao ti\u1ebfp hi\u1ec7u qu\u1ea3, \u0111\u1ed9 tr\u1ec5 th\u1ea5p gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7. Ch\u00fang cung c\u1ea5p n\u1ec1n t\u1ea3ng cho c\u00e1c tr\u1ea3i nghi\u1ec7m web t\u01b0\u01a1ng t\u00e1c v\u00e0 h\u1ea5p d\u1eabn.<\/span><\/p>\n<h3><b>H\u00e3y ph\u00e2n bi\u1ec7t s\u1ef1 kh\u00e1c nhau gi\u1eefa framework v\u00e0 th\u01b0 vi\u1ec7n (library) trong l\u1eadp tr\u00ecnh web<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Th\u01b0 vi\u1ec7n cung c\u1ea5p m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c h\u00e0m h\u1ed7 tr\u1ee3, \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c module m\u00e0 m\u00e3 ngu\u1ed3n trong \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 g\u1ecdi \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3. Ng\u01b0\u1ee3c l\u1ea1i, Framework cung c\u1ea5p c\u00e1c h\u00e0m ho\u1eb7c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a s\u1eb5n nh\u01b0ng ch\u01b0a \u0111\u01b0\u1ee3c tri\u1ec3n khai, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u1ef1 vi\u1ebft m\u00e3 \u0111\u1ec3 t\u1ea1o ra \u1ee9ng d\u1ee5ng t\u00f9y ch\u1ec9nh.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Framework<\/b><\/td>\n<td><b>Th\u01b0 vi\u1ec7n<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Cung c\u1ea5p m\u1ed9t c\u1ea5u tr\u00fac s\u1eb5n c\u00f3, m\u1ed9t khung x\u01b0\u01a1ng cho \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. N\u00f3 \u0111\u1ecbnh ngh\u0129a c\u00e1ch th\u1ee9c c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau c\u1ee7a \u1ee9ng d\u1ee5ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">T\u1eadp h\u1ee3p c\u00e1c h\u00e0m ho\u1eb7c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 c\u1ee5 th\u1ec3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\"> Kh\u00f3 c\u00f3 th\u1ec3 thay th\u1ebf c\u00e1c framework.<\/span><\/td>\n<td><span style=\"font-weight: 400;\"> D\u1ec5 b\u1ecb thay th\u1ebf b\u1eb1ng m\u1ed9t th\u01b0 vi\u1ec7n kh\u00e1c<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ph\u00e1t tri\u1ec3n m\u1ed9t framework \u0111\u00f2i h\u1ecfi nhi\u1ec1u m\u00e3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t v\u00e0 t\u0103ng th\u1eddi gian t\u1ea3i.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u01b0 vi\u1ec7n th\u01b0\u1eddng t\u1eadp trung v\u00e0o m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3 nh\u01b0 x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u HTTP, t\u1ea1o c\u00e1c hi\u1ec7u \u1ee9ng \u0111\u1ed9ng, ho\u1eb7c t\u01b0\u01a1ng t\u00e1c v\u1edbi API.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3 \u0111\u01b0a framework v\u00e0o m\u1ed9t d\u1ef1 \u00e1n hi\u1ec7n c\u00f3 m\u1ed9t c\u00e1ch tr\u01a1n tru.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p d\u1ec5 d\u00e0ng v\u00e0o c\u00e1c d\u1ef1 \u00e1n hi\u1ec7n c\u00f3 \u0111\u1ec3 th\u00eam m\u1ed9t s\u1ed1 ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m CSRF (Y\u00eau c\u1ea7u gi\u1ea3 m\u1ea1o ch\u00e9o trang web) v\u00e0 c\u00e1ch ng\u0103n ch\u1eb7n<\/b><\/h3>\n<p><b>CSRF (Cross-Site Request Forgery)<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t ki\u1ec3u t\u1ea5n c\u00f4ng m\u1ea1ng, trong \u0111\u00f3 k\u1ebb t\u1ea5n c\u00f4ng l\u1eeba ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng kh\u00f4ng mong mu\u1ed1n tr\u00ean m\u1ed9t \u1ee9ng d\u1ee5ng web m\u00e0 h\u1ecd \u0111\u00e3 \u0111\u0103ng nh\u1eadp.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 ng\u0103n ch\u1eb7n CSRF, Web Developer c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c c\u00e1ch sau:<\/span><\/p>\n<p><b>S\u1eed d\u1ee5ng m\u00e3 th\u00f4ng b\u00e1o CSRF (CSRF Token)<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u1ee8ng d\u1ee5ng g\u1eedi m\u00e3 th\u00f4ng b\u00e1o CSRF duy nh\u1ea5t t\u1edbi tr\u00ecnh duy\u1ec7t ng\u01b0\u1eddi d\u00f9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u1ed7i khi th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u quan tr\u1ecdng (POST, PUT, DELETE), m\u00e3 n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c g\u1eedi k\u00e8m \u0111\u1ec3 x\u00e1c th\u1ef1c t\u00ednh h\u1ee3p l\u1ec7.<\/span><\/li>\n<\/ul>\n<p><b>X\u00e1c th\u1ef1c ti\u00eau \u0111\u1ec1 tham chi\u1ebfu (Referer Header)<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra ti\u00eau \u0111\u1ec1 &#8220;Referer&#8221; trong y\u00eau c\u1ea7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u00f3 \u0111\u1ebfn t\u1eeb mi\u1ec1n h\u1ee3p l\u1ec7.<\/span><\/li>\n<\/ul>\n<p><b>Tri\u1ec3n khai cookie SameSite<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh SameSite trong cookie \u0111\u1ec3 ng\u0103n cookie \u0111\u01b0\u1ee3c g\u1eedi k\u00e8m v\u1edbi c\u00e1c y\u00eau c\u1ea7u t\u1eeb mi\u1ec1n kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1ea3m thi\u1ec3u nguy c\u01a1 y\u00eau c\u1ea7u tr\u00e1i ph\u00e9p b\u1eaft ngu\u1ed3n t\u1eeb c\u00e1c trang web b\u00ean ngo\u00e0i.<\/span><\/li>\n<\/ul>\n<h3><b>C\u00e1c th\u00e0nh ph\u1ea7n b\u1eadc cao (HOC) trong React l\u00e0 g\u00ec? Ch\u00fang ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c th\u00e0nh ph\u1ea7n b\u1eadc cao (HOC) l\u00e0 c\u00e1c h\u00e0m l\u1ea5y m\u1ed9t th\u00e0nh ph\u1ea7n l\u00e0m \u0111\u1ea7u v\u00e0o v\u00e0 tr\u1ea3 v\u1ec1 m\u1ed9t th\u00e0nh ph\u1ea7n m\u1edbi v\u1edbi ch\u1ee9c n\u0103ng n\u00e2ng cao. Ch\u00fang cho ph\u00e9p t\u00e1i s\u1eed d\u1ee5ng m\u00e3, tr\u1eebu t\u01b0\u1ee3ng h\u00f3a logic v\u00e0 k\u1ebft h\u1ee3p nhi\u1ec1u h\u00e0nh vi trong c\u00e1c th\u00e0nh ph\u1ea7n React.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">HOC \u0111\u00f3ng g\u00f3i th\u00e0nh ph\u1ea7n g\u1ed1c, th\u00eam props ho\u1eb7c s\u1eeda \u0111\u1ed5i h\u00e0nh vi c\u1ee7a th\u00e0nh ph\u1ea7n \u0111\u00f3 tr\u01b0\u1edbc khi hi\u1ec3n th\u1ecb th\u00e0nh ph\u1ea7n \u0111\u00f3. C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m x\u00e1c th\u1ef1c, ghi nh\u1eadt k\u00fd v\u00e0 ph\u00e2n t\u00e1ch m\u00e3.<\/span><\/p>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa &lt;window.onload&gt; v\u00e0 &lt;onDocumentReady&gt;?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">window.onload() s\u1ebd \u0111\u01b0\u1ee3c g\u1ecdi khi DOM v\u00e0 t\u1ea5t c\u1ea3 t\u00e0i nguy\u00ean li\u00ean quan \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i. Trong khi \u0111\u00f3, $(document).ready() s\u1ebd \u0111\u01b0\u1ee3c th\u1ef1c thi ngay khi DOM \u0111\u01b0\u1ee3c t\u1ea3i.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>window.onload()<\/b><\/td>\n<td><b>$(document).ready()<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 \u0111\u01b0\u1ee3c g\u1ecdi khi m\u1ecdi th\u1ee9 \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i xong.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u00e2y l\u00e0 m\u1ed9t h\u00e0m c\u1ee7a jQuery \u0111\u01b0\u1ee3c g\u1ecdi ngay khi DOM \u0111\u01b0\u1ee3c t\u1ea3i.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u1ee3i cho \u0111\u1ebfn khi t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean nh\u01b0 h\u00ecnh \u1ea3nh, iframe, \u0111\u1ed1i t\u01b0\u1ee3ng, t\u1eadp l\u1ec7nh \u0111\u01b0\u1ee3c t\u1ea3i xong.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 thao t\u00e1c v\u1edbi DOM, g\u1eafn s\u1ef1 ki\u1ec7n, kh\u1edfi t\u1ea1o plugin,&#8230;<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t h\u00e0m window.onload()<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u h\u00e0m $(document).ready() trong trang.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b> Gi\u1ea3i th\u00edch kh\u00e1i ni\u1ec7m v\u1ec1 ki\u1ebfn \u200b\u200btr\u00fac kh\u00f4ng m\u00e1y ch\u1ee7 trong ph\u00e1t tri\u1ec3n web<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">M\u00e1y t\u00ednh kh\u00f4ng m\u00e1y ch\u1ee7 (serverless computing) l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh ph\u00e1t tri\u1ec3n web v\u00e0 \u1ee9ng d\u1ee5ng, trong \u0111\u00f3 Web Developer kh\u00f4ng c\u1ea7n qu\u1ea3n l\u00fd m\u00e1y ch\u1ee7 v\u1eadt l\u00fd ho\u1eb7c \u1ea3o tr\u1ef1c ti\u1ebfp.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thay v\u00e0o \u0111\u00f3, c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y (nh\u01b0 AWS, Google Cloud, ho\u1eb7c Azure) x\u1eed l\u00fd to\u00e0n b\u1ed9 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng, bao g\u1ed3m c\u1ea5p ph\u00e1t t\u00e0i nguy\u00ean, m\u1edf r\u1ed9ng quy m\u00f4, v\u00e0 b\u1ea3o tr\u00ec h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<h3><b>Web component l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Web Components l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c API n\u1ec1n t\u1ea3ng web cho ph\u00e9p l\u1eadp tr\u00ecnh vi\u00ean t\u1ea1o ra c\u00e1c th\u00e0nh ph\u1ea7n c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng v\u1edbi ch\u1ee9c n\u0103ng \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i. Web Components g\u1ed3m ba th\u00e0nh ph\u1ea7n ch\u00ednh:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>API Custom Elements <\/b><span style=\"font-weight: 400;\">cho ph\u00e9p \u0111\u1ecbnh ngh\u0129a c\u00e1c th\u00e0nh ph\u1ea7n HTML v\u1edbi h\u00e0nh vi t\u00f9y ch\u1ec9nh. C\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng gi\u1ed1ng nh\u01b0 b\u1ea5t k\u1ef3 th\u00e0nh ph\u1ea7n HTML t\u00edch h\u1ee3p n\u00e0o kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Shadow DOM<\/b><span style=\"font-weight: 400;\"> t\u1ea1o ra m\u1ed9t c\u00e2y con DOM c\u00f3 ph\u1ea1m vi v\u00e0 b\u1ecb c\u00f4 l\u1eadp trong m\u1ed9t th\u00e0nh ph\u1ea7n. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c ki\u1ec3u \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>HTML Templates<\/b><span style=\"font-weight: 400;\"> cho ph\u00e9p \u0111\u1ecbnh ngh\u0129a c\u00e1c ph\u1ea7n \u0111\u00e1nh d\u1ea5u c\u00f3 th\u1ec3 t\u00e1i s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o nhi\u1ec1u l\u1ea7n.<\/span><\/li>\n<\/ul>\n<h3><b>CSP c\u00f3 \u00fd ngh\u0129a g\u00ec trong b\u1ea3o m\u1eadt l\u1eadp tr\u00ecnh web?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CSP (Content Security Policy) l\u00e0 m\u1ed9t t\u00ednh n\u0103ng b\u1ea3o m\u1eadt quan tr\u1ecdng trong ph\u00e1t tri\u1ec3n web, gi\u00fap b\u1ea3o v\u1ec7 c\u00e1c trang web kh\u1ecfi nhi\u1ec1u m\u1ed1i \u0111e d\u1ecda m\u1ea1ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng <\/span><b>Cross-Site Scripting (XSS)<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c l\u1ed7 h\u1ed5ng XSS li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u0111\u01b0a c\u00e1c t\u1eadp l\u1ec7nh \u0111\u1ed9c h\u1ea1i v\u00e0o trang web. CSP gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng c\u00e1ch cho ph\u00e9p c\u00e1c Web Developer th\u1ef1c thi c\u00e1c ch\u00ednh s\u00e1ch qu\u1ea3n l\u00fd ngu\u1ed3n n\u1ed9i dung c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea3i. H\u01a1n n\u1eefa, CSP cho ph\u00e9p b\u00e1o c\u00e1o v\u00e0 g\u1ee1 l\u1ed7i, cung c\u1ea5p c\u01a1 ch\u1ebf \u0111\u1ec3 Web Developer nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c b\u00e1o c\u00e1o h\u00e0nh vi vi ph\u1ea1m ch\u00ednh s\u00e1ch.\u00a0<\/span><\/p>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111o l\u01b0\u1eddng hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng web?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 \u0111o l\u01b0\u1eddng hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng web, c\u00e1c Web Developer c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng nhi\u1ec1u c\u00f4ng c\u1ee5, k\u1ef9 thu\u1eadt v\u00e0 s\u1ed1 li\u1ec7u kh\u00e1c nhau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch v\u00e0 l\u1eadp h\u1ed3 s\u01a1 hi\u1ec7u su\u1ea5t nh\u01b0 Lighthouse, WebPageTest v\u00e0 Chrome DevTools<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Theo d\u00f5i c\u00e1c s\u1ed1 li\u1ec7u hi\u1ec7u su\u1ea5t ch\u00ednh nh\u01b0 First Contentful Paint (FCP), Time to Interactive (TTI) v\u00e0 Largest Contentful Paint (LCP)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tri\u1ec3n khai Real User Monitoring (RUM) v\u00e0 Application Performance Monitoring (APM) \u0111\u1ec3 \u0111o l\u01b0\u1eddng tr\u1ea3i nghi\u1ec7m c\u1ee7a ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i v\u00e0 hi\u1ec7u su\u1ea5t ph\u00eda m\u00e1y ch\u1ee7<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Th\u1ef1c hi\u1ec7n ki\u1ec3m tra t\u1ea3i v\u00e0 ki\u1ec3m tra \u1ee9ng su\u1ea5t \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n t\u1ea3i l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao<\/span><\/li>\n<\/ul>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 tr\u00ecnh duy\u1ec7t b\u1ecb treo trong Chrome, Firefox v\u00e0 Edge?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 tr\u00ecnh duy\u1ec7t b\u1ecb treo, Web Developer c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c c\u00e1ch sau:<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>X\u00e1c \u0111\u1ecbnh v\u00e0 x\u00f3a c\u00e1c ti\u1ec7n \u00edch m\u1edf r\u1ed9ng b\u1ecb tr\u1ee5c tr\u1eb7c<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">M\u1ed9t ti\u1ec7n \u00edch m\u1edf r\u1ed9ng ho\u1eb7c ti\u1ec7n \u00edch b\u1ed5 sung b\u1ecb tr\u1ee5c tr\u1eb7c c\u00f3 th\u1ec3 khi\u1ebfn tr\u00ecnh duy\u1ec7t b\u1ecb \u0111\u00f3ng b\u0103ng. Khi n\u00e0y, h\u00e3y ki\u1ec3m tra c\u00e1c ti\u1ec7n \u00edch b\u1ed5 sung \u0111\u00e3 c\u00e0i \u0111\u1eb7t v\u00e0 x\u00f3a nh\u1eefng ti\u1ec7n \u00edch b\u1ed5 sung kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft n\u1eefa. Qu\u00e1 nhi\u1ec1u ti\u1ec7n \u00edch m\u1edf r\u1ed9ng c\u0169ng c\u00f3 th\u1ec3 l\u00e0m \u0111\u00f3ng b\u0103ng ho\u1eb7c l\u00e0m ch\u1eadm tr\u00ecnh duy\u1ec7t.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Gi\u1ea3m m\u1ee9c s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb c\u1ee7a tr\u00ecnh duy\u1ec7t<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">C\u00e1c tr\u00ecnh duy\u1ec7t ti\u00eau t\u1ed1n r\u1ea5t nhi\u1ec1u b\u1ed9 nh\u1edb, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi m\u1edf nhi\u1ec1u tab. N\u1ebfu m\u00e1y t\u00ednh kh\u00f4ng c\u00f3 nhi\u1ec1u RAM, tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 ch\u1eadm l\u1ea1i ho\u1eb7c th\u1eadm ch\u00ed b\u1ecb s\u1eadp.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>T\u1eaft c\u00e1c t\u1eadp l\u1ec7nh kh\u00f4ng c\u1ea7n thi\u1ebft<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">C\u00e1c t\u1eadp l\u1ec7nh kh\u00f4ng c\u1ea7n thi\u1ebft \u0111ang ch\u1ea1y trong tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 khi\u1ebfn tr\u00ecnh duy\u1ec7t b\u1ecb \u0111\u00f3ng b\u0103ng, bao g\u1ed3m c\u1ea3 t\u00ecnh tr\u1ea1ng treo v\u00e0 \u0111\u00f3ng b\u0103ng. C\u00f3 th\u1ec3 nh\u1edd \u0111\u1ebfn s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a c\u00e1c ti\u1ec7n \u00edch b\u1ed5 sung nh\u01b0 NoScript cho Firefox v\u00e0 uMatrix cho Chrome \u0111\u1ec3 ch\u1eb7n c\u00e1c plugin nh\u01b0 JavaScript, Java, Flash,&#8230;\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Qu\u00e9t ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng b\u1ea3o m\u1eadt c\u1ee7a tr\u00ecnh duy\u1ec7t v\u00e0 g\u00e2y ra s\u1ef1 c\u1ed1 k\u1ebft n\u1ed1i. Khi n\u00e0y b\u1ea1n c\u1ea7n qu\u00e9t ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i tr\u00ean tr\u00ecnh duy\u1ec7t b\u1eb1ng b\u1ea5t k\u1ef3 tr\u00ecnh qu\u00e9t ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i c\u01a1 b\u1ea3n ho\u1eb7c t\u00edch h\u1ee3p n\u00e0o.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu b\u1ea1n \u0111\u00e3 th\u1eed m\u1ecdi c\u00e1ch m\u00e0 s\u1ef1 c\u1ed1 v\u1eabn ti\u1ebfp di\u1ec5n, h\u00e3y g\u1ee1 c\u00e0i \u0111\u1eb7t tr\u00ecnh duy\u1ec7t v\u00e0 c\u00e0i \u0111\u1eb7t phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t.<\/span><\/p>\n<h3><b>V\u1edbi t\u01b0 c\u00e1ch l\u00e0 Web Developer, b\u1ea1n th\u01b0\u1eddng t\u1ed1i \u01b0u h\u00f3a th\u1eddi gian t\u1ea3i \u1ee9ng d\u1ee5ng web nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">B\u1ea1n t\u1ed1i \u01b0u h\u00f3a th\u1eddi gian t\u1ea3i \u1ee9ng d\u1ee5ng web c\u1ee7a m\u00ecnh nh\u01b0 th\u1ebf n\u00e0o v\u1edbi t\u01b0 c\u00e1ch l\u00e0 Nh\u00e0 ph\u00e1t tri\u1ec3n web?<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>N\u00e9n v\u00e0 t\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh:<\/b><span style=\"font-weight: 400;\"> K\u00edch th\u01b0\u1edbc t\u1ec7p h\u00ecnh \u1ea3nh nh\u1ecf h\u01a1n gi\u00fap gi\u1ea3m th\u1eddi gian t\u1ea3i. S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 \u0111\u1ec3 n\u00e9n 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>S\u1eed d\u1ee5ng t\u1ec7p CSS v\u00e0 JavaScript b\u00ean ngo\u00e0i: <\/b><span style=\"font-weight: 400;\">\u0110\u1eb7t CSS v\u00e0 JavaScript v\u00e0o c\u00e1c t\u1ec7p b\u00ean ngo\u00e0i \u0111\u1ec3 t\u1eadn d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m c\u1ee7a tr\u00ecnh duy\u1ec7t v\u00e0 gi\u1eef cho c\u00e1c t\u00e0i li\u1ec7u HTML nh\u1ecf h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u1ea3m thi\u1ec3u chuy\u1ec3n h\u01b0\u1edbng:<\/b><span style=\"font-weight: 400;\"> Gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng chuy\u1ec3n h\u01b0\u1edbng tr\u00ean trang web c\u1ee7a b\u1ea1n \u0111\u1ec3 gi\u1ea3m th\u1eddi gian y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i HTTP, t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea3i CSS v\u00e0 JavaScript kh\u00f4ng \u0111\u1ed3ng b\u1ed9: <\/b><span style=\"font-weight: 400;\">T\u1ea3i c\u00e1c t\u1ec7p n\u00e0y kh\u00f4ng \u0111\u1ed3ng b\u1ed9 \u0111\u1ec3 cho ph\u00e9p nhi\u1ec1u t\u1ec7p t\u1ea3i xu\u1ed1ng c\u00f9ng l\u00fac, c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thu nh\u1ecf m\u00e3: <\/b><span style=\"font-weight: 400;\">Thu nh\u1ecf HTML, CSS v\u00e0 JavaScript b\u1eb1ng c\u00e1ch x\u00f3a c\u00e1c kho\u1ea3ng tr\u1eafng, ch\u00fa th\u00edch v\u00e0 k\u00fd t\u1ef1 kh\u00f4ng c\u1ea7n thi\u1ebft \u0111\u1ec3 gi\u1ea3m k\u00edch th\u01b0\u1edbc t\u1ec7p v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cache d\u1eef li\u1ec7u:<\/b><span style=\"font-weight: 400;\"> Cache nh\u1eefng d\u1eef li\u1ec7u \u00edt thay \u0111\u1ed5i, file t\u0129nh \u0111\u1ec3 gi\u1ea3m t\u1ea3i cho tr\u00ecnh duy\u1ec7t. C\u00f3 th\u1ec3 c\u00e2n nh\u1eafc s\u1eed d\u1ee5ng CDN.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket\"><\/span><b>T\u1ed5ng k\u1ebft<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Ki\u1ebfn th\u1ee9c l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng gi\u00fap b\u1ea1n h\u00ecnh th\u00e0nh t\u01b0 duy x\u00e2y d\u1ef1ng v\u00e0 ph\u00e1t tri\u1ec3n k\u1ef9 n\u0103ng ho\u00e0n ch\u1ec9nh cho m\u00ecnh. B\u00ean c\u1ea1nh nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer n\u00eau tr\u00ean, \u0111\u1eebng qu\u00ean c\u1eadp nh\u1eefng th\u00eam nh\u1eefng xu h\u01b0\u1edbng m\u1edbi trong l\u0129nh v\u1ef1c c\u1ee7a b\u1ea1n n\u1eefa nh\u00e9. Ch\u00fac b\u1ea1n ph\u1ecfng v\u1ea5n th\u00e0nh c\u00f4ng.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u1ede v\u1ecb tr\u00ed Web Developer, b\u1ea1n ph\u1ea3i n\u1eafm th\u1eadt r\u00f5 nh\u1eefng ki\u1ebfn th\u1ee9c m\u1edbi c\u00f3 th\u1ec3 th\u1ef1c h\u00e0nh t\u1ed1t m\u1ea3ng Frontend ho\u1eb7c Backend m\u00e0 m\u00ecnh \u0111\u00e3 ch\u1ecdn. Tuy nhi\u00ean \u0111\u00f4i khi, s\u1ef1 s\u00e2u r\u1ed9ng, phong ph\u00fa v\u1ec1 ki\u1ebfn th\u1ee9c c\u1ee7a t\u1eebng m\u1ea3ng c\u00f3 th\u1ec3 khi\u1ebfn b\u1ea1n c\u1ea3m th\u1ea5y m\u00f4ng lung, kh\u00f4ng bi\u1ebft b\u1eaft \u0111\u1ea7u t\u1eeb [&hellip;]<\/p>\n","protected":false},"author":213,"featured_media":83681,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109,105],"tags":[],"class_list":["post-83258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it","category-phong-van-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 Web Developer ph\u1ed5 bi\u1ebfn - ITviec Blog<\/title>\n<meta name=\"description\" content=\"L\u01b0u ngay 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Web Developer k\u00e8m theo c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft, t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao d\u00e0nh cho t\u1ea5t c\u1ea3 m\u1ecdi c\u1ea5p \u0111\u1ed9 Developer,\" \/>\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-web-developer\/\" \/>\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 Web Developer ph\u1ed5 bi\u1ebfn\" \/>\n<meta property=\"og:description\" content=\"\u1ede v\u1ecb tr\u00ed Web Developer, b\u1ea1n ph\u1ea3i n\u1eafm th\u1eadt r\u00f5 nh\u1eefng ki\u1ebfn th\u1ee9c m\u1edbi c\u00f3 th\u1ec3 th\u1ef1c h\u00e0nh t\u1ed1t m\u1ea3ng Frontend ho\u1eb7c Backend m\u00e0 m\u00ecnh \u0111\u00e3 ch\u1ecdn. 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