{"id":82654,"date":"2024-12-19T10:58:58","date_gmt":"2024-12-19T03:58:58","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=82654"},"modified":"2024-12-19T10:58:58","modified_gmt":"2024-12-19T03:58:58","slug":"cau-hoi-phong-van-fullstack-developer","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-fullstack-developer\/","title":{"rendered":"Top 35+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer ph\u1ed5 bi\u1ebfn"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 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-fullstack-developer\/#Fullstack_Developer_thuc_hien_nhung_cong_viec_gi\" >Fullstack Developer th\u1ef1c hi\u1ec7n nh\u1eefng c\u00f4ng vi\u1ec7c 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-fullstack-developer\/#Cau_hoi_phong_van_Fullstack_Developer_dau_vao_Fresher_Junior_Fullstack_Devloper\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer \u0111\u1ea7u v\u00e0o (Fresher \/ Junior Fullstack Devloper)<\/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-fullstack-developer\/#Cau_hoi_phong_van_Fullstack_Developer_trung_cap_Middle_Fullstack_Developer\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer trung c\u1ea5p (Middle Fullstack 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-fullstack-developer\/#Cau_hoi_phong_van_Fullstack_Developer_voi_Senior_Fullstack_Developer\" >C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer v\u1edbi Senior Fullstack 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-fullstack-developer\/#Tong_ket_cau_hoi_phong_van_Fullstack_Developer\" >T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer<\/a><\/li><\/ul><\/nav><\/div>\n<p><em><strong>V\u1edbi v\u1ecb tr\u00ed Fullstack Developer, b\u1ea1n s\u1ebd ph\u1ee5 tr\u00e1ch c\u1ea3 m\u1ea3ng Frontend (UX\/UI, flow) v\u00e0 Backend (database, API) c\u1ee7a trang web ho\u1eb7c \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi b\u1ea1n v\u1eeba ph\u1ea3i c\u00f3 ki\u1ebfn th\u1ee9c chuy\u00ean s\u00e2u c\u1ea3 2 m\u1ea3ng, v\u1eeba nh\u1ea1y b\u00e9n \u1ee9ng bi\u1ebfn linh ho\u1ea1t v\u1edbi t\u1eebng c\u00f4ng c\u1ee5 l\u1eadp tr\u00ecnh. Trong b\u00e0i vi\u1ebft n\u00e0y, ITviec s\u1ebd t\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer th\u01b0\u1eddng g\u1eb7p bao g\u1ed3m c\u1ea3 ki\u1ebfn th\u1ee9c v\u00e0 x\u1eed l\u00fd t\u00ecnh hu\u1ed1ng.<\/strong><\/em><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ecdc b\u00e0i vi\u1ebft \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fullstack Developer th\u1ef1c hi\u1ec7n nh\u1eefng c\u00f4ng vi\u1ec7c 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 Fullstack Developer cho c\u1ea5p \u0111\u1ea7u v\u00e0o<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer cho c\u1ea5p trung<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer cho c\u1ea5p chuy\u00ean nghi\u1ec7p<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Fullstack_Developer_thuc_hien_nhung_cong_viec_gi\"><\/span><b>Fullstack Developer th\u1ef1c hi\u1ec7n nh\u1eefng c\u00f4ng vi\u1ec7c g\u00ec?<\/b><i><\/i><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">C\u00e1c <a href=\"https:\/\/itviec.com\/blog\/3-loi-ich-cho-su-nghiep-khi-lam-full-stack-developer\/\" target=\"_blank\" rel=\"noopener\"><strong>Fullstack Developer<\/strong><\/a> l\u00e0 nh\u1eefng chuy\u00ean gia l\u1eadp tr\u00ecnh c\u00f3 kh\u1ea3 n\u0103ng th\u1ef1c hi\u1ec7n c\u1ea3 c\u00e1c nhi\u1ec7m v\u1ee5 Frontend (ph\u1ea7n giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng) v\u00e0 Backend (ph\u1ea7n logic x\u1eed l\u00fd ph\u00eda m\u00e1y ch\u1ee7) trong m\u1ed9t d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m. N\u00f3i c\u00e1ch kh\u00e1c, h\u1ecd l\u00e0 nh\u1eefng ng\u01b0\u1eddi &#8220;t\u1ea5t c\u1ea3 trong m\u1ed9t&#8221; c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t \u1ee9ng d\u1ee5ng web ho\u1eb7c \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng t\u1eeb \u0111\u1ea7u \u0111\u1ebfn cu\u1ed1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f4ng vi\u1ec7c h\u00e0ng ng\u00e0y c\u1ee7a m\u1ed9t Fullstack Developer c\u00f3 th\u1ec3 l\u00e0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00e1t tri\u1ec3n v\u00e0 duy tr\u00ec c\u00e1c d\u1ecbch v\u1ee5, giao di\u1ec7n web<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">X\u00e2y d\u1ef1ng c\u00e1c t\u00ednh n\u0103ng ho\u1eb7c API cho s\u1ea3n ph\u1ea9m m\u1edbi<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra, kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 ph\u1ea7n m\u1ec1m v\u00e0 s\u1eeda l\u1ed7i<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u01b0\u1edbng d\u1eabn c\u00f4ng vi\u1ec7c cho c\u00e1c \u0111\u1ed3ng nghi\u1ec7p c\u1ea5p d\u01b0\u1edbi (\u0111\u1ed1i v\u1edbi c\u00e1c Fullstack Developer t\u1eeb c\u1ea5p trung tr\u1edf l\u00ean)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u1eadp nh\u1eadt c\u00e1c th\u00f4ng tin, ki\u1ebfn th\u1ee9c m\u1edbi ph\u1ee5c v\u1ee5 cho c\u00f4ng vi\u1ec7c<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Theo b\u00e1o c\u00e1o <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 &amp; Th\u1ecb Tr\u01b0\u1eddng Tuy\u1ec3n D\u1ee5ng IT 2024 &#8211; 2025 t\u1ea1i Vi\u1ec7t Nam<\/strong><\/a><\/span><span style=\"font-weight: 400;\">\u00a0t\u1eeb ITviec<\/span><i><span style=\"font-weight: 400;\">,<\/span><\/i><span style=\"font-weight: 400;\"> m\u1ed9t Fullstack Developer c\u00f3 th\u1ec3 c\u00f3 m\u1ee9c l\u01b0\u01a1ng trung v\u1ecb theo s\u1ed1 n\u0103m kinh nghi\u1ec7m nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li>&lt;1 n\u0103m kinh nghi\u1ec7m: 14.200.000\u0111\/ th\u00e1ng<\/li>\n<li>1 &#8211; 2 n\u0103m kinh nghi\u1ec7m: 16.650.000\u0111 \/th\u00e1ng<\/li>\n<li><span style=\"font-weight: 400;\">3 &#8211; 4 n\u0103m kinh nghi\u1ec7m: 29.900.000\u0111\/ th\u00e1ng<\/span><\/li>\n<li>5 &#8211; 8 n\u0103m kinh nghi\u1ec7m: 39.700.000\u0111\/ th\u00e1ng<\/li>\n<li>&gt;8 n\u0103m kinh nghi\u1ec7m: 50.000.000\u0111\/ th\u00e1ng<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">L\u01b0u \u00fd, m\u1ee9c l\u01b0\u01a1ng n\u00e0y ch\u01b0a bao g\u1ed3m c\u00e1c kho\u1ea3n h\u1ed7 tr\u1ee3 kh\u00e1c t\u1eeb C\u00f4ng ty (n\u1ebfu c\u00f3).<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Fullstack_Developer_dau_vao_Fresher_Junior_Fullstack_Devloper\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer \u0111\u1ea7u v\u00e0o (Fresher \/ Junior Fullstack Devloper)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Frontend v\u00e0 Backend c\u00f3 g\u00ec kh\u00e1c nhau?<\/b><i><\/i><\/h3>\n<p><b>L\u1eadp tr\u00ecnh Frontend:<\/b><span style=\"font-weight: 400;\"> T\u1eadp trung v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 tr\u1ef1c quan v\u00e0 t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng tr\u00ean trang web ho\u1eb7c \u1ee9ng d\u1ee5ng. C\u00e1c c\u00f4ng ngh\u1ec7 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng bao g\u1ed3m HTML, CSS v\u00e0 JavaScript \u0111\u1ec3 t\u1ea1o giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng v\u00e0 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng (UI\/UX).<\/span><\/p>\n<p><b>L\u1eadp tr\u00ecnh Backend:<\/b><span style=\"font-weight: 400;\"> T\u1eadp trung v\u00e0o vi\u1ec7c x\u1eed l\u00fd logic ph\u00eda m\u00e1y ch\u1ee7, c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 API (giao di\u1ec7n l\u1eadp tr\u00ecnh \u1ee9ng d\u1ee5ng), cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho ch\u1ee9c n\u0103ng c\u1ee7a trang web. Python, Ruby, PHP, Node.js,&#8230; l\u00e0 c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh ch\u00ednh c\u1ee7a Backend Developer.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa Frontend v\u00e0 Backend c\u00f3 th\u1ec3 x\u00e9t d\u1ef1a tr\u00ean c\u00e1c ti\u00eau ch\u00ed sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Frontend<\/b><\/td>\n<td><b>Backend<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Ng\u00f4n ng\u1eef th\u01b0\u1eddng d\u00f9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">HTML, CSS, JavaScript<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Java, Python, Ruby, PHP, Node.js<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u1eadp trung<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng v\u00e0 tr\u1ea3i nghi\u1ec7m<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Logic m\u00e1y ch\u1ee7, c\u01a1 s\u1edf d\u1eef li\u1ec7u, API v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a \u1ee9ng d\u1ee5ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Th\u01b0 vi\u1ec7n \/ Framework th\u01b0\u1eddng d\u00f9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">React, Angular, Vue.js, Bootstrap<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Django, Express, Ruby on Rails, Spring<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Vai tr\u00f2<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Thi\u1ebft k\u1ebf, b\u1ed1 c\u1ee5c (layout) v\u00e0 kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i (responsive) c\u1ee7a UI<\/span><\/td>\n<td><span style=\"font-weight: 400;\">X\u1eed l\u00fd d\u1eef li\u1ec7u, logic ph\u00eda m\u00e1y ch\u1ee7, b\u1ea3o m\u1eadt \u1ee9ng d\u1ee5ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng ti\u1ebfp c\u1eadn<\/b><\/td>\n<td><span style=\"font-weight: 400;\">L\u00e0 giao di\u1ec7n m\u00e0 ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u00e1c tr\u1ef1c ti\u1ebfp<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3 ti\u1ebfp c\u1eadn tr\u1ef1c ti\u1ebfp; t\u01b0\u01a1ng t\u00e1c th\u00f4ng qua giao di\u1ec7n<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Objective<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Giao di\u1ec7n v\u00e0 c\u1ea3m nh\u1eadn c\u1ee7a \u1ee9ng d\u1ee5ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ee9c n\u0103ng, b\u1ea3o m\u1eadt v\u00e0 hi\u1ec7u su\u1ea5t<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>C\u00f4ng c\u1ee5<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Tr\u00ecnh duy\u1ec7t (browser), th\u01b0 vi\u1ec7n giao di\u1ec7n (frontend libraby)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e1y ch\u1ee7 (server), c\u01a1 s\u1edf d\u1eef li\u1ec7u (database), khung n\u1ec1n t\u1ea3ng (backend framework)<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ki\u1ec3m tra (testing)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng, b\u1ed1 c\u1ee5c, kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ki\u1ec3m th\u1eed ph\u00eda m\u00e1y ch\u1ee7 (server-side testing), API endpoints, logic<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/front-end-vs-back-end\/\" target=\"_blank\" rel=\"noopener\"><strong>Front End vs Back End: Kh\u00e1c nhau v\u00e0 H\u1ed7 tr\u1ee3 nhau nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>\u0110a lu\u1ed3ng (multithreading) l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Lu\u1ed3ng (thread) l\u00e0 m\u1ed9t ph\u1ea7n ho\u1eb7c \u0111\u01a1n v\u1ecb \u0111\u1ed9c l\u1eadp c\u1ee7a m\u1ed9t ti\u1ebfn tr\u00ecnh (ho\u1eb7c \u1ee9ng d\u1ee5ng) \u0111ang \u0111\u01b0\u1ee3c th\u1ef1c thi. Khi c\u00f3 nhi\u1ec1u lu\u1ed3ng ch\u1ea1y \u0111\u1ed3ng th\u1eddi trong m\u1ed9t ti\u1ebfn tr\u00ecnh, ch\u00fang ta g\u1ecdi \u0111\u00f3 l\u00e0 &#8220;\u0111a lu\u1ed3ng&#8221; (multithreading).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng \u0111a lu\u1ed3ng mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 chi ph\u00ed h\u01a1n nh\u1edd c\u00e1c \u01b0u \u0111i\u1ec3m nh\u01b0: T\u1ed1i \u01b0u \u0111\u01b0\u1ee3c ngu\u1ed3n t\u00e0i nguy\u00ean, t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i c\u1ee7a \u1ee9ng d\u1ee5ng, gi\u1ea3m thi\u1ec3u \u0111\u01b0\u1ee3c r\u1ee7i ro, qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 ngu\u1ed3n d\u1eef li\u1ec7u.<\/span><\/p>\n<h3><b>H\u00e3y k\u1ec3 t\u00ean c\u00e1c c\u00f4ng c\u1ee5 v\u00e0 c\u00f4ng ngh\u1ec7 th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 l\u1eadp tr\u00ecnh full stack m\u00e0 b\u1ea1n bi\u1ebft<\/b><i><\/i><\/h3>\n<h4><b>C\u00f4ng c\u1ee5 v\u00e0 c\u00f4ng ngh\u1ec7 l\u1eadp tr\u00ecnh Frontend<\/b><\/h4>\n<table>\n<tbody>\n<tr>\n<td><b>Framework v\u00e0 Th\u01b0 vi\u1ec7n<\/b><\/td>\n<td><span style=\"font-weight: 400;\">React, Angular, VueJS, Svelte<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>CSS Framework<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Bootstrap, Tailwind CSS, Foundation<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>State Management (<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Redux, Vuex<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Package Managers (Tr\u00ecnh qu\u1ea3n l\u00fd g\u00f3i)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">npm, yarn<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Preprocessors (B\u1ed9 ti\u1ec1n x\u1eed l\u00fd)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Sass, Less<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Browser Debugging Tools (C\u00f4ng c\u1ee5 g\u1ee1 l\u1ed7i tr\u00ecnh duy\u1ec7t)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chrome Dev Tools, Firefox Developer Tools<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4><b>C\u00f4ng c\u1ee5 v\u00e0 c\u00f4ng ngh\u1ec7 l\u1eadp tr\u00ecnh Backend<\/b><\/h4>\n<table>\n<tbody>\n<tr>\n<td><b>Ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh<\/b><\/td>\n<td><span style=\"font-weight: 400;\">JavaScript (Node.js), Python, Java, Ruby, PHP, Go<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Frameworks<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Express.js (Node.js), Django (Python), Flask (Python), Spring Boot (Java), Ruby on Rails (Ruby), Laravel (PHP), ASP.NET (C#)<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>API Development and Documentation<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Swagger \/ OpenAPI, Postman, GraphQL<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Authentication and Authorization (X\u00e1c th\u1ef1c v\u00e0 u\u1ef7 quy\u1ec1n)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">OAuth2, JWT (JSON Web Tokens), Passport.js<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Database Management System (H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; <\/span><b>Relational Databases:<\/b><span style=\"font-weight: 400;\"> MySQL, PostgreSQL, SQLite, Microsoft SQL Server<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; <\/span><b>NoSQL Databases: <\/b><span style=\"font-weight: 400;\">MongoDB, Redis, Cassandra, Firebase<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Build and Deployment Tools (C\u00f4ng c\u1ee5 x\u00e2y d\u1ef1ng v\u00e0 tri\u1ec3n khai)<\/b><\/td>\n<td><span style=\"font-weight: 400;\">&#8211;<\/span><b> Build Tools (C\u00f4ng c\u1ee5 x\u00e2y d\u1ef1ng):<\/b><span style=\"font-weight: 400;\"> Maven (Java), Gradle (Java, Kotlin), Gulp (JavaScript), Grunt (JavaScript)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; <\/span><b>Containerization and Orchestration (Container ho\u00e1 v\u00e0 \u0111i\u1ec1u ph\u1ed1i):<\/b><span style=\"font-weight: 400;\"> Docker, Kubernetes<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; <\/span><b>CI\/CD Tools:<\/b><span style=\"font-weight: 400;\"> Jenkins, GitLab CI\/CD, Azure DevOps<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u1eadp tr\u00ecnh c\u1eb7p (pair programming) l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">L\u1eadp tr\u00ecnh c\u1eb7p (pair programming) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p l\u1eadp tr\u00ecnh m\u00e0 hai l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 vi\u1ebft code tr\u00ean duy nh\u1ea5t m\u1ed9t m\u00e1y t\u00ednh.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3, m\u1ed9t l\u1eadp tr\u00ecnh vi\u00ean s\u1ebd \u0111\u00f3ng vai tr\u00f2 l\u00e0 driver &#8211; ng\u01b0\u1eddi vi\u1ebft code ch\u00ednh, l\u1eadp tr\u00ecnh vi\u00ean c\u00f2n l\u1ea1i ch\u1ecbu tr\u00e1ch nhi\u1ec7m gi\u00e1m s\u00e1t (navigator), ki\u1ec3m tra, s\u1eeda l\u1ed7i th\u1eadm ch\u00ed l\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng nh\u1eefng b\u01b0\u1edbc c\u1ea7n l\u00e0m ti\u1ebfp theo. Vai tr\u00f2 c\u1ee7a c\u1ea3 hai l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 thay \u0111\u1ed5i cho nhau.<\/span><\/p>\n<h3><b>Theo b\u1ea1n, CORS (Cross-Origin Resource Sharing) c\u00f3 \u00fd ngh\u0129a g\u00ec trong l\u1eadp tr\u00ecnh Fullstack?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">CORS (Cross-Origin Resource Sharing) \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c chia s\u1ebb t\u00e0i nguy\u00ean gi\u1eefa c\u00e1c ngu\u1ed3n. \u0110\u00e2y l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf tr\u00ecnh duy\u1ec7t cho ph\u00e9p c\u00e1c trang web trong m\u1ed9t mi\u1ec1n c\u00f3 quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c t\u00e0i nguy\u00ean trong c\u00e1c mi\u1ec1n kh\u00e1c. C\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p CORS v\u1edbi c\u00e1c t\u1eadp l\u1ec7nh web khi c\u1ea7n k\u1ebft n\u1ed1i v\u1edbi mi\u1ec1n, giao th\u1ee9c ho\u1eb7c c\u1ed5ng b\u00ean ngo\u00e0i. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng c\u1ea7n thi\u1ebft khi c\u00e1c \u1ee9ng d\u1ee5ng web frontend (ch\u1ea1y tr\u00ean tr\u00ecnh duy\u1ec7t) c\u1ea7n g\u1ecdi c\u00e1c API t\u1eeb backend (ch\u1ea1y tr\u00ean m\u00e1y ch\u1ee7 kh\u00e1c).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">CORS ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c ti\u00eau \u0111\u1ec1 HTTP \u0111\u1ec3 th\u00f4ng b\u00e1o v\u1edbi tr\u00ecnh duy\u1ec7t r\u1eb1ng m\u1ed9t trang web t\u1ea1i m\u1ed9t ngu\u1ed3n (origin) c\u1ee5 th\u1ec3 c\u00f3 quy\u1ec1n truy c\u1eadp v\u00e0o t\u00e0i nguy\u00ean t\u1ea1i m\u1ed9t ngu\u1ed3n kh\u00e1c.<\/span><\/p>\n<h3><b>JavaScript Promise trong l\u1eadp tr\u00ecnh Fullstack l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><b>Promise<\/b><span style=\"font-weight: 400;\"> trong JavaScript gi\u1ed1ng nh\u01b0 m\u1ed9t &#8220;h\u1ed9p ch\u1ee9a&#8221; cho m\u1ed9t gi\u00e1 tr\u1ecb s\u1ebd c\u00f3 trong t\u01b0\u01a1ng lai. Gi\u1ed1ng nh\u01b0 vi\u1ec7c b\u1ea1n \u0111\u1eb7t mua m\u1ed9t cu\u1ed1n s\u00e1ch tr\u00ean Shopee nh\u01b0ng ph\u1ea3i ch\u1edd 3 &#8211; 4 ng\u00e0y n\u1eefa m\u1edbi nh\u1eadn \u0111\u01b0\u1ee3c. Trong l\u00fac ch\u1edd \u0111\u1ee3i, b\u1ea1n \u0111\u00e3 \u0111\u1ecdc m\u1ed9t cu\u1ed1n s\u00e1ch kh\u00e1c. Cho \u0111\u1ebfn khi s\u00e1ch \u0111\u1ebfn, b\u1ea1n m\u1edbi b\u1eaft \u0111\u1ea7u \u0111\u1ecdc.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">T\u01b0\u01a1ng t\u1ef1 nh\u01b0 trong l\u1eadp tr\u00ecnh Fullstack, <\/span><b>Promise<\/b><span style=\"font-weight: 400;\"> cho ph\u00e9p b\u1ea1n ti\u1ebfp t\u1ee5c vi\u1ebft v\u00e0 \u0111i\u1ec1u ch\u1ec9nh code trong khi ch\u1edd \u0111\u1ee3i m\u1ed9t thao t\u00e1c kh\u00e1c ho\u00e0n th\u00e0nh, ch\u1eb3ng h\u1ea1n t\u1ea3i d\u1eef li\u1ec7u t\u1eeb m\u00e1y ch\u1ee7. Khi d\u1eef li\u1ec7u s\u1eb5n s\u00e0ng, Promise s\u1ebd cung c\u1ea5p n\u00f3 cho b\u1ea1n.<\/span><\/p>\n<h3><b>Promise v\u00e0 Callback Hell c\u00f3 g\u00ec kh\u00e1c nhau?<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Callback<\/b><\/td>\n<td><b>Promise<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00fa ph\u00e1p kh\u00f3 hi\u1ec3u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00fa ph\u00e1p th\u00e2n thi\u1ec7n v\u00e0 d\u1ec5 \u0111\u1ecdc v\u00ec c\u00f3 then v\u00e0 catch<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f3 qu\u1ea3n l\u00fd trong vi\u1ec7c x\u1eed l\u00fd l\u1ed7i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 qu\u1ea3n l\u00fd trong vi\u1ec7c x\u1eed l\u00fd l\u1ed7i khi s\u1eed d\u1ee5ng kh\u1ed1i catch<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 t\u1ea1o ra callback hell<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u1ea3i quy\u1ebft callback hell<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Code kh\u00f3 \u0111\u1ecdc, kh\u00f3 b\u1ea3o tr\u00ec<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u1ea3m thi\u1ec3u code l\u1ed3ng nhau<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Short polling v\u00e0 Long polling c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Short Polling<\/strong> l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt m\u00e0 trong \u0111\u00f3, m\u00e1y kh\u00e1ch y\u00eau c\u1ea7u d\u1eef li\u1ec7u t\u1eeb m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y ch\u1ee7 s\u1ebd tr\u1ea3 v\u1ec1 ph\u1ea3n h\u1ed3i n\u1ebfu d\u1eef li\u1ec7u c\u00f3 s\u1eb5n. Trong tr\u01b0\u1eddng h\u1ee3p d\u1eef li\u1ec7u kh\u00f4ng c\u00f3 s\u1eb5n, m\u00e1y ch\u1ee7 s\u1ebd tr\u1ea3 v\u1ec1 ph\u1ea3n h\u1ed3i tr\u1ed1ng. Qu\u00e1 tr\u00ecnh n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i theo c\u00e1c kho\u1ea3ng th\u1eddi gian \u0111\u1ec1u \u0111\u1eb7n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ng\u01b0\u1ee3c l\u1ea1i, <strong>Long Polling<\/strong> l\u00e0 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea9y th\u00f4ng tin\/d\u1eef li\u1ec7u t\u1eeb m\u00e1y ch\u1ee7 \u0111\u1ebfn m\u00e1y kh\u00e1ch nhanh nh\u1ea5t c\u00f3 th\u1ec3. Khi m\u00e1y kh\u00e1ch g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7, long-polling duy tr\u00ec k\u1ebft n\u1ed1i gi\u1eefa hai m\u00e1y. K\u1ebft n\u1ed1i n\u00e0y \u0111\u01b0\u1ee3c duy tr\u00ec cho \u0111\u1ebfn khi th\u00f4ng tin s\u1eb5n s\u00e0ng \u0111\u01b0\u1ee3c g\u1eedi t\u1eeb m\u00e1y ch\u1ee7 \u0111\u1ebfn m\u00e1y kh\u00e1ch. K\u1ebft n\u1ed1i ch\u1ec9 \u0111\u00f3ng khi m\u00e1y ch\u1ee7 \u0111\u00e3 g\u1eedi d\u1eef li\u1ec7u tr\u1edf l\u1ea1i m\u00e1y kh\u00e1ch ho\u1eb7c khi \u0111\u1ea1t \u0111\u1ebfn ng\u01b0\u1ee1ng th\u1eddi gian ch\u1edd.\u00a0<\/span><\/p>\n<h3><b>H\u00e3y cho bi\u1ebft s\u1ef1 kh\u00e1c nhau gi\u1eefa GraphQL v\u00e0 REST<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>GraphQL\u00a0<\/b><\/td>\n<td><b>REST<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ng\u00f4n ng\u1eef truy v\u1ea5n, cho ph\u00e9p truy xu\u1ea5t d\u1eef li\u1ec7u khai b\u00e1o \u0111\u1ec3 cung c\u1ea5p cho kh\u00e1ch h\u00e0ng quy\u1ec1n ki\u1ec3m so\u00e1t d\u1eef li\u1ec7u n\u00e0o s\u1ebd truy xu\u1ea5t t\u1eeb \u200b\u200bAPI.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ki\u1ec3u ki\u1ebfn \u200b\u200btr\u00fac thi\u1ebft k\u1ebf API x\u00e1c \u0111\u1ecbnh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c r\u00e0ng bu\u1ed9c \u0111\u1ec3 t\u1ea1o d\u1ecbch v\u1ee5 web.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00e1c truy v\u1ea5n GraphQL \u0111\u01b0a ra k\u1ebft qu\u1ea3 c\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c, gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u00e0nh vi c\u1ee7a REST ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c HTTP v\u00e0 URI \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.\u00a0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea3o m\u1eadt API, m\u1eb7c d\u00f9 c\u00e1c t\u00ednh n\u0103ng b\u1ea3o m\u1eadt kh\u00f4ng ho\u00e0n thi\u1ec7n nh\u01b0 REST<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 tri\u1ec3n khai nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c x\u00e1c th\u1ef1c API, ch\u1eb3ng h\u1ea1n x\u00e1c th\u1ef1c HTTP, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea3o m\u1eadt REST API.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 truy xu\u1ea5t m\u1ecdi th\u1ee9 b\u1ea1n c\u1ea7n th\u00f4ng qua m\u1ed9t y\u00eau c\u1ea7u API duy nh\u1ea5t.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh c\u1ea5u tr\u00fac th\u00f4ng tin b\u1ea1n c\u1ea7n v\u00e0 m\u00e1y ch\u1ee7 s\u1ebd tr\u1ea3 v\u1ec1 c\u00f9ng m\u1ed9t c\u1ea5u tr\u00fac.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">V\u00ec REST API c\u00f3 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee9ng nh\u1eafc n\u00ean d\u1eef li\u1ec7u tr\u1ea3 v\u1ec1 c\u00f3 th\u1ec3 kh\u00f4ng theo nh\u1eefng g\u00ec b\u1ea1n mong mu\u1ed1n ho\u1eb7c b\u1ea1n ph\u1ea3i th\u1ef1c hi\u1ec7n r\u1ea5t nhi\u1ec1u y\u00eau c\u1ea7u \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 h\u1ed7 tr\u1ee3 \u0111\u1ecbnh d\u1ea1ng JSON.\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">XML, YAML, JSON, HTML v\u00e0 c\u00e1c \u0111\u1ecbnh d\u1ea1ng kh\u00e1c c\u0169ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng v\u00e0 nhi\u1ec1u d\u1ecbch v\u1ee5 vi m\u00f4.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01a1n gi\u1ea3n v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng d\u1ef1a tr\u00ean t\u00e0i nguy\u00ean.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Hoisting l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Hoisting l\u00e0 h\u00e0nh vi m\u1eb7c \u0111\u1ecbnh trong JavaScript. Trong \u0111\u00f3 c\u00e1c khai b\u00e1o bi\u1ebfn v\u00e0 h\u00e0m \u0111\u01b0\u1ee3c di chuy\u1ec3n l\u00ean \u0111\u1ea7u ph\u1ea1m vi t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang trong giai \u0111o\u1ea1n bi\u00ean d\u1ecbch. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea5t k\u1ec3 c\u00e1c khai b\u00e1o n\u00e0y xu\u1ea5t hi\u1ec7n \u1edf \u0111\u00e2u trong ph\u1ea1m vi, ch\u00fang \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp trong ph\u1ea1m vi \u0111\u00f3.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khi b\u1ea1n khai b\u00e1o m\u1ed9t bi\u1ebfn b\u1eb1ng var, khai b\u00e1o n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c \u0111\u01b0a l\u00ean \u0111\u1ea7u ph\u1ea1m vi ch\u1ee9c n\u0103ng ho\u1eb7c ph\u1ea1m vi to\u00e0n c\u1ee5c. Tuy nhi\u00ean, vi\u1ec7c g\u00e1n gi\u00e1 tr\u1ecb cho bi\u1ebfn \u0111\u00f3 kh\u00f4ng b\u1ecb hoisted.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khai b\u00e1o bi\u1ebfn b\u1eb1ng let v\u00e0 const c\u0169ng \u0111\u01b0\u1ee3c hoisted nh\u01b0ng ch\u00fang kh\u00f4ng \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n kh\u00f4ng th\u1ec3 truy c\u1eadp ch\u00fang tr\u01b0\u1edbc khi d\u00f2ng m\u00e3 khai b\u00e1o th\u1ef1c thi.<\/span><\/li>\n<\/ul>\n<h3><b>T\u00edch h\u1ee3p li\u00ean t\u1ee5c (CI) l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">CI l\u00e0 qu\u00e1 tr\u00ecnh t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u00e0 t\u00edch h\u1ee3p c\u00e1c thay \u0111\u1ed5i code v\u00e0o m\u1ed9t d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m duy nh\u1ea5t, th\u01b0\u1eddng l\u00e0 nhi\u1ec1u l\u1ea7n trong ng\u00e0y. M\u1ee5c \u0111\u00edch c\u1ee7a ho\u1ea1t \u0111\u1ed9ng DevOps n\u00e0y l\u00e0 cho ph\u00e9p c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean h\u1ee3p nh\u1ea5t c\u00e1c thay \u0111\u1ed5i tr\u00ean code v\u00e0o m\u1ed9t kho l\u01b0u tr\u1eef trung t\u00e2m. C\u00e1c c\u00f4ng c\u1ee5 t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o code m\u1edbi ch\u00ednh x\u00e1c tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong quy tr\u00ecnh CI, h\u1ec7 th\u1ed1ng ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n m\u00e3 ngu\u1ed3n \u0111\u00f3ng vai tr\u00f2 c\u1ed1t l\u00f5i. B\u00ean c\u1ea1nh \u0111\u00f3, quy tr\u00ecnh c\u00f2n \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi c\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra t\u1ef1 \u0111\u1ed9ng kh\u00e1c nh\u01b0 ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng code, \u0111\u00e1nh gi\u00e1 c\u00fa ph\u00e1p v\u00e0 c\u00e1c b\u01b0\u1edbc ki\u1ec3m duy\u1ec7t kh\u00e1c.<\/span><\/p>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/ci-cd-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>CI\/CD l\u00e0 g\u00ec? L\u1ee3i \u00edch v\u00e0 c\u00e1c nguy\u00ean t\u1eafc tri\u1ec3n khai CI\/CD<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>B\u1ea1n hi\u1ec3u th\u1ebf n\u00e0o v\u1ec1 ACID trong c\u01a1 s\u1edf h\u1ec7 th\u1ed1ng d\u1eef li\u1ec7u?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">ACID l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c thu\u1ed9c t\u00ednh chu\u1ea9n, \u0111\u1ea3m b\u1ea3o c\u00e1c giao d\u1ecbch tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u di\u1ec5n ra m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. N\u1ebfu m\u1ed9t ho\u1ea1t \u0111\u1ed9ng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00e1p \u1ee9ng c\u00e1c thu\u1ed9c t\u00ednh n\u00e0y, th\u00ec n\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 giao d\u1ecbch ACID. C\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u00e1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u1ec7 th\u1ed1ng giao d\u1ecbch.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Atomicity: <\/b><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o to\u00e0n b\u1ed9 giao d\u1ecbch di\u1ec5n ra nh\u01b0 m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Consistency: <\/b><span style=\"font-weight: 400;\">C\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eabn nh\u1ea5t qu\u00e1n do m\u1ed9t giao d\u1ecbch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Isolation: <\/b><span style=\"font-weight: 400;\">Nhi\u1ec1u giao d\u1ecbch c\u00f3 th\u1ec3 di\u1ec5n ra \u0111\u1ed9c l\u1eadp m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 s\u1ef1 can thi\u1ec7p n\u00e0o.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Durability:<\/b><span style=\"font-weight: 400;\"> Ngay c\u1ea3 khi h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i, giao d\u1ecbch \u0111\u00e3 cam k\u1ebft v\u1eabn kh\u00f4ng thay \u0111\u1ed5i.<\/span><\/li>\n<\/ul>\n<h3><b>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a MongoDB l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">MongoDB l\u00e0 m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u phi quan h\u1ec7. M\u00f4 h\u00ecnh linh ho\u1ea1t c\u1ee7a MongoDB l\u01b0u tr\u1eef d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac v\u00e0 cung c\u1ea5p h\u1ed7 tr\u1ee3 l\u1eadp ch\u1ec9 m\u1ee5c \u0111\u1ea7y \u0111\u1ee7.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a MongoDB l\u00e0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Truy v\u1ea5n t\u00f9y \u00fd<\/b><span style=\"font-weight: 400;\">: H\u1ed7 tr\u1ee3 c\u00e1c truy v\u1ea5n kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n truy v\u1ea5n tr\u01b0\u1eddng, ph\u1ea1m vi v\u00e0 bi\u1ec3u th\u1ee9c ch\u00ednh quy. C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c truy v\u1ea5n n\u00e0y \u0111\u1ec3 tr\u1ea3 v\u1ec1 c\u00e1c ph\u1ea7n c\u1ee7a t\u00e0i li\u1ec7u ho\u1eb7c to\u00e0n b\u1ed9 t\u00e0i li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sao ch\u00e9p<\/b><span style=\"font-weight: 400;\">: Cung c\u1ea5p t\u00ednh kh\u1ea3 d\u1ee5ng cao c\u1ee7a c\u00e1c b\u1ed9 b\u1ea3n sao.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1eadp ch\u1ec9 m\u1ee5c (Index)<\/b><span style=\"font-weight: 400;\">: C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ch\u1ec9 m\u1ee5c ch\u00ednh v\u00e0 ph\u1ee5 \u0111\u1ec3 l\u1eadp ch\u1ec9 m\u1ee5c c\u00e1c tr\u01b0\u1eddng c\u1ee7a t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong c\u01a1 s\u1edf d\u1eef li\u1ec7u MongoDB.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u01b0u tr\u1eef d\u1eef li\u1ec7u l\u1edbn:<\/b><span style=\"font-weight: 400;\"> MongoDB c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u00e1c t\u1eadp d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, nh\u1edd v\u00e0o kh\u1ea3 n\u0103ng ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u v\u00e0 l\u01b0u tr\u1eef tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e2n b\u1eb1ng t\u1ea3i:<\/b><span style=\"font-weight: 400;\"> T\u1ef1 \u0111\u1ed9ng ph\u00e2n ph\u1ed1i t\u1ea3i l\u00e0m vi\u1ec7c gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 trong c\u1ee5m, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t cao v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u01b0u tr\u1eef d\u1eef li\u1ec7u l\u1edbn:<\/b><span style=\"font-weight: 400;\"> MongoDB c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u00e1c t\u1eadp d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, nh\u1edd v\u00e0o kh\u1ea3 n\u0103ng ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u v\u00e0 l\u01b0u tr\u1eef tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Fullstack_Developer_trung_cap_Middle_Fullstack_Developer\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer trung c\u1ea5p (Middle Fullstack Developer)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Express.js l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Express.js l\u00e0 m\u1ed9t framework (khung l\u00e0m vi\u1ec7c) backend \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean n\u1ec1n t\u1ea3ng Node.js. N\u00f3 cung c\u1ea5p m\u1ed9t c\u1ea5u tr\u00fac v\u00e0 c\u00e1c c\u00f4ng c\u1ee5 c\u1ea7n thi\u1ebft \u0111\u1ec3 gi\u00fap c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng web v\u00e0 API m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3.<\/span><\/p>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 d\u00f9ng calc() trong Tailwind CSS?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">calc() l\u00e0 m\u1ed9t h\u00e0m t\u00edch h\u1ee3p trong CSS cho ph\u00e9p b\u1ea1n th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh to\u00e1n h\u1ecdc. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng h\u00e0m calc() trong Tailwind CSS \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh gi\u00e1 tr\u1ecb \u0111\u1ed9ng cho c\u00e1c thu\u1ed9c t\u00ednh CSS kh\u00e1c nhau.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 c\u00e1ch s\u1eed d\u1ee5ng calc() trong Tailwind CSS:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng calc( ) b\u00ean trong HTML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng tailwind CSS l\u00e0m ki\u1ec3u n\u1ed9i tuy\u1ebfn (Inline Style).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Th\u00eam c\u00e1c l\u1edbp t\u00f9y ch\u1ec9nh ho\u1eb7c m\u1edf r\u1ed9ng c\u1ea5u h\u00ecnh Tailwind \u0111\u1ec3 t\u00e1i s\u1eed d\u1ee5ng nhi\u1ec1u h\u01a1n tr\u00ean nhi\u1ec1u ph\u1ea7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Tailwind ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c ti\u1ec7n \u00edch t\u00f9y ch\u1ec9nh trong t\u1ec7p tailwind.config.js.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u1ecbnh ngh\u0129a m\u1ed9t l\u1edbp CSS t\u00f9y ch\u1ec9nh b\u1eb1ng calc() v\u00e0 \u00e1p d\u1ee5ng n\u00f3 c\u00f9ng v\u1edbi c\u00e1c ti\u1ec7n \u00edch c\u1ee7a Tailwind.<\/span><\/li>\n<\/ul>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/tailwind-css\/\" target=\"_blank\" rel=\"noopener\"><strong>Tailwind CSS: H\u01b0\u1edbng d\u1eabn 3 c\u00e1ch thi\u1ebft l\u1eadp Tailwind chi ti\u1ebft<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>N\u00eau s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa Server-side Scripting v\u00e0 Client-side Scripting<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Server-side Scripting<\/b><\/td>\n<td><b>Client-side Scripting<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>L\u0129nh v\u1ef1c t\u1eadp trung<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Backend<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Frontend<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>X\u1eed l\u00fd<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea7u n\u1ed1i gi\u1eefa client v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u, x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u t\u1eeb client v\u00e0 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u AJAX \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u00e1y ch\u1ee7.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ng\u00f4n ng\u1eef h\u1ed7 tr\u1ee3<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ruby, ASP.net, PHP v\u00e0 Python,&#8230;<\/span><\/td>\n<td><span style=\"font-weight: 400;\"> CSS, JavaScript, HTML,&#8230;<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u00ednh b\u1ea3o m\u1eadt<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Cao<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u1ea5p<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 xem m\u00e3 ngu\u1ed3n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e3 ngu\u1ed3n hi\u1ec3n th\u1ecb v\u1edbi ng\u01b0\u1eddi d\u00f9ng. Tuy nhi\u00ean, c\u00f3 th\u1ec3 minify ho\u1eb7c obfuscate \u0111\u1ec3 kh\u00f3 \u0111\u1ecdc h\u01a1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Ch\u1ee9c n\u0103ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Cung c\u1ea5p \u0111\u1ea7u ra theo y\u00eau c\u1ea7u cho ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thao t\u00e1c v\u00e0 cho ph\u00e9p truy c\u1eadp v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 th\u1ef1c hi\u1ec7n l\u1ec7nh g\u1ecdi t\u1eeb AJAX?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Th\u1ef1c hi\u1ec7n l\u1ec7nh g\u1ecdi Ajax t\u1eeb JavaScript c\u00f3 ngh\u0129a l\u00e0 g\u1eedi y\u00eau c\u1ea7u kh\u00f4ng \u0111\u1ed3ng b\u1ed9 \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u1ec3 l\u1ea5y ho\u1eb7c g\u1eedi d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i trang web. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u1eadp nh\u1eadt n\u1ed9i dung \u0111\u1ed9ng, n\u00e2ng cao tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng b\u1eb1ng c\u00e1ch l\u00e0m cho \u1ee9ng d\u1ee5ng web t\u01b0\u01a1ng t\u00e1c v\u00e0 ph\u1ea3n h\u1ed3i h\u01a1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 3 c\u00e1ch th\u1ef1c hi\u1ec7n l\u1ec7nh g\u1ecdi t\u1eeb AJAX:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1ch 1: <\/b><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng XMLHttpRequest \u0111\u1ec3 th\u1ef1c hi\u1ec7n l\u1ec7nh g\u1ecdi Ajax. Ph\u01b0\u01a1ng th\u1ee9c XMLHttpRequest() t\u1ea1o ra m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng XMLHttpRequest \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u v\u1edbi m\u00e1y ch\u1ee7.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1ch 2: <\/b><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng th\u1ee9c ajax() \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong jQuery \u0111\u1ec3 th\u1ef1c hi\u1ec7n l\u1ec7nh g\u1ecdi ajax. Ph\u01b0\u01a1ng th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 thay th\u1ebf cho t\u1ea5t c\u1ea3 c\u00e1c c\u00e1ch ti\u1ebfp c\u1eadn kh\u00f4ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c l\u1ec7nh g\u1ecdi ajax.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1ch 3:<\/b><span style=\"font-weight: 400;\"> S\u1eed d\u1ee5ng API fetch() \u0111\u1ec3 t\u1ea1o XMLHttpRequest v\u1edbi m\u00e1y ch\u1ee7. API n\u00e0y t\u1ea1o m\u1ed9t y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 v\u00e0 nh\u1eadn k\u1ebft qu\u1ea3 d\u01b0\u1edbi d\u1ea1ng m\u1ed9t l\u1eddi h\u1ee9a \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft th\u00e0nh chu\u1ed7i.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i jQuery v\u00e0 Fetch API, c\u00f2n c\u00f3 nhi\u1ec1u th\u01b0 vi\u1ec7n kh\u00e1c nh\u01b0 Axios, Superagent, &#8230; m\u1ed7i th\u01b0 vi\u1ec7n c\u00f3 nh\u1eefng \u01b0u \u0111i\u1ec3m v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng ri\u00eang.<\/span><\/p>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/ajax-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>AJAX l\u00e0 g\u00ec? Quy tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng v\u00e0 th\u1ef1c h\u00e0nh AJAX d\u1ec5 hi\u1ec3u cho Web Developer<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>N\u00eau s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa chu\u1ea9n h\u00f3a (normalization) v\u00e0 phi chu\u1ea9n h\u00f3a (denormalization)<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Normalization<\/b><\/td>\n<td><b>Denormalization<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Ho\u1ea1t \u0111\u1ed9ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Lo\u1ea1i b\u1ecf d\u1eef li\u1ec7u d\u01b0 th\u1eeba (nhi\u1ec1u b\u1ea3n sao d\u1eef li\u1ec7u) kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u nh\u1ea5t qu\u00e1n, kh\u00f4ng d\u01b0 th\u1eeba<\/span><\/td>\n<td><span style=\"font-weight: 400;\">K\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng th\u00e0nh m\u1ed9t b\u1ea3ng duy nh\u1ea5t \u0111\u1ec3 c\u00f3 th\u1ec3 truy v\u1ea5n nhanh ch\u00f3ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>M\u1ee5c ti\u00eau<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ee7 y\u1ebfu t\u1eadp trung v\u00e0o vi\u1ec7c x\u00f3a d\u1eef li\u1ec7u kh\u00f4ng s\u1eed d\u1ee5ng v\u00e0 gi\u1ea3m d\u1eef li\u1ec7u tr\u00f9ng l\u1eb7p v\u00e0 kh\u00f4ng nh\u1ea5t qu\u00e1n t\u1eeb c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 th\u1ef1c hi\u1ec7n truy v\u1ea5n nhanh h\u01a1n b\u1eb1ng c\u00e1ch th\u00eam d\u1eef li\u1ec7u d\u1ef1 ph\u00f2ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>S\u1ed1 l\u01b0\u1ee3ng b\u1ea3ng<\/b><\/td>\n<td><span style=\"font-weight: 400;\">S\u1ed1 l\u01b0\u1ee3ng b\u1ea3ng gi\u1ea3m do d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u gi\u1ea3m<\/span><\/td>\n<td><span style=\"font-weight: 400;\">T\u00edch h\u1ee3p d\u1eef li\u1ec7u v\u00e0o c\u00f9ng m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00ean s\u1ed1 l\u01b0\u1ee3ng b\u1ea3ng \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u0103ng l\u00ean<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u00ednh to\u00e0n v\u1eb9n<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c duy tr\u00ec b\u1eb1ng chu\u1ea9n h\u00f3a. M\u1ed9t thay \u0111\u1ed5i \u0111\u1ed1i v\u1edbi d\u1eef li\u1ec7u trong b\u1ea3ng s\u1ebd kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u1ed1i quan h\u1ec7 c\u1ee7a n\u00f3 v\u1edbi b\u1ea3ng kh\u00e1c.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng \u0111\u01b0\u1ee3c duy tr\u00ec b\u1eb1ng phi chu\u1ea9n h\u00f3a<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Kh\u00f4ng gian \u0111\u0129a<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 truy c\u1eadp l\u1ecbch s\u1eed trong JavaScript?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Object History (l\u1ecbch s\u1eed \u0111\u1ed1i t\u01b0\u1ee3ng) ch\u1ee9a l\u1ecbch s\u1eed c\u1ee7a tr\u00ecnh duy\u1ec7t. URL c\u1ee7a c\u00e1c trang m\u00e0 ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 truy c\u1eadp \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef d\u01b0\u1edbi d\u1ea1ng ng\u0103n x\u1ebfp trong object history. C\u00f3 nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 qu\u1ea3n l\u00fd\/truy c\u1eadp l\u1ecbch s\u1eed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a Object History:<\/span><\/p>\n<h4><b>Ph\u01b0\u01a1ng ph\u00e1p forward()<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea3i URL ti\u1ebfp theo trong danh s\u00e1ch history. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng gi\u1ed1ng h\u1ec7t nh\u01b0 n\u00fat next trong tr\u00ecnh duy\u1ec7t. C\u00fa ph\u00e1p:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">history.forward()<\/span><\/pre>\n<h4><b>Ph\u01b0\u01a1ng ph\u00e1p back()<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea3i URL tr\u01b0\u1edbc \u0111\u00f3 trong danh s\u00e1ch history. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng gi\u1ed1ng h\u1ec7t nh\u01b0 n\u00fat back trong tr\u00ecnh duy\u1ec7t. C\u00fa ph\u00e1p:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">history.back()<\/span><\/pre>\n<h4><b>Ph\u01b0\u01a1ng ph\u00e1p go()<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea3i URL t\u1eeb danh s\u00e1ch history. C\u00fa ph\u00e1p:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">history.go(integer)<\/span><\/pre>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn m\u1ed9t trang web kh\u00e1c b\u1eb1ng JavaScript?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">JavaScript c\u00f3 th\u1ec3 chuy\u1ec3n h\u01b0\u1edbng ng\u01b0\u1eddi d\u00f9ng t\u1eeb trang hi\u1ec7n t\u1ea1i sang m\u1ed9t trang web kh\u00e1c (URL kh\u00e1c). \u0110\u1ec3 chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn m\u1ed9t trang web kh\u00e1c, l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n thao t\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng window.location v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y s\u1ebd cho ph\u00e9p \u0111i\u1ec1u h\u01b0\u1edbng theo ch\u01b0\u01a1ng tr\u00ecnh.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c c\u00e1ch chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn m\u1ed9t trang web kh\u00e1c b\u1eb1ng JavaScript:<\/span><\/p>\n<p><b>S\u1eed d\u1ee5ng window.location.href<\/b><span style=\"font-weight: 400;\"> \u0111\u1ec3 \u0111\u1eb7t ho\u1eb7c tr\u1ea3 v\u1ec1 URL \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a trang hi\u1ec7n t\u1ea1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thu\u1ed9c t\u00ednh n\u00e0y c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1eb7t gi\u00e1 tr\u1ecb href tr\u1ecf \u0111\u1ebfn m\u1ed9t trang web kh\u00e1c, m\u1ed9t \u0111\u1ecba ch\u1ec9 email ho\u1eb7c tr\u1ea3 v\u1ec1 m\u1ed9t chu\u1ed7i ch\u1ee9a to\u00e0n b\u1ed9 URL c\u1ee7a trang, bao g\u1ed3m c\u1ea3 giao th\u1ee9c. <\/span><span style=\"font-weight: 400;\">C\u00fa ph\u00e1p:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">window.location.href = \"URL\"<\/span><\/pre>\n<p><b>S\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c location.replace()<\/b><span style=\"font-weight: 400;\"> \u0111\u1ec3 thay th\u1ebf t\u00e0i li\u1ec7u hi\u1ec7n t\u1ea1i b\u1eb1ng t\u00e0i li\u1ec7u \u0111\u00e3 ch\u1ec9 \u0111\u1ecbnh.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng th\u1ee9c n\u00e0y kh\u00e1c v\u1edbi ph\u01b0\u01a1ng th\u1ee9c assignment() v\u00ec n\u00f3 x\u00f3a t\u00e0i li\u1ec7u hi\u1ec7n t\u1ea1i kh\u1ecfi l\u1ecbch s\u1eed t\u00e0i li\u1ec7u, do \u0111\u00f3 kh\u00f4ng th\u1ec3 quay l\u1ea1i t\u00e0i li\u1ec7u tr\u01b0\u1edbc \u0111\u00f3 b\u1eb1ng n\u00fat back. C\u00fa ph\u00e1p:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">location.replace(\"URL\");<\/span><\/pre>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ng\u0103n ch\u1eb7n bot thu th\u1eadp d\u1eef li\u1ec7u t\u1eeb API c\u00f3 th\u1ec3 truy c\u1eadp c\u00f4ng khai?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">N\u1ebfu d\u1eef li\u1ec7u c\u1ee7a API c\u00f3 s\u1eb5n c\u00f4ng khai, kh\u00f3 c\u00f3 th\u1ec3 ng\u0103n bot thu th\u1eadp d\u1eef li\u1ec7u. Tuy nhi\u00ean, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u ti\u1ebft ho\u1eb7c gi\u1edbi h\u1ea1n t\u1ed1c \u0111\u1ed9 \u0111\u1ec3 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 n\u00e0y.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec1u ti\u1ebft l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ng\u0103n thi\u1ebft b\u1ecb th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u x\u00e1c \u0111\u1ecbnh trong m\u1ed9t kho\u1ea3ng th\u1eddi gian x\u00e1c \u0111\u1ecbnh. Khi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u v\u01b0\u1ee3t qu\u00e1 s\u1ed1 l\u01b0\u1ee3ng \u0111\u00e3 ch\u1ec9 \u0111\u1ecbnh, l\u1ed7i HTTP s\u1ebd \u0111\u01b0\u1ee3c \u0111\u01b0a ra.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp ho\u1eb7c s\u1eed d\u1ee5ng API key \u0111\u1ec3 x\u00e1c th\u1ef1c danh t\u00ednh, gi\u00fap h\u1ea1n ch\u1ebf c\u00e1c y\u00eau c\u1ea7u \u0111\u1ebfn t\u1eeb c\u00e1c ngu\u1ed3n kh\u00f4ng x\u00e1c \u0111\u1ecbnh.<\/span><\/p>\n<h3><b>B\u1ea1n th\u1ef1c hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng CRUD trong MongoDB nh\u01b0 th\u1ebf n\u00e0o?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">CRUD l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a Create, Read, Update v\u00e0 Delete.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Mongoose, m\u1ed9t th\u01b0 vi\u1ec7n Object Data Modeling (ODM) d\u00e0nh cho MongoDB, \u0111\u01a1n gi\u1ea3n h\u00f3a c\u00e1c thao t\u00e1c n\u00e0y b\u1eb1ng c\u00e1ch cung c\u1ea5p m\u1ed9t giao di\u1ec7n quen thu\u1ed9c t\u01b0\u01a1ng t\u1ef1 nh\u01b0 khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c Mongoose \u0111\u1ec3 t\u1ea1o t\u00e0i li\u1ec7u m\u1edbi, t\u00ecm t\u00e0i li\u1ec7u hi\u1ec7n c\u00f3, c\u1eadp nh\u1eadt d\u1eef li\u1ec7u v\u00e0 x\u00f3a t\u00e0i li\u1ec7u kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u MongoDB.<\/span><\/p>\n<h3><b>Git v\u00e0 Github c\u00f3 \u0111i\u1ec3m g\u00ec kh\u00e1c nhau?<\/b><i><\/i><\/h3>\n<ul>\n<li><b>Git: <\/b><span style=\"font-weight: 400;\">Git l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n ph\u00e2n t\u00e1n \u0111\u1ec3 theo d\u00f5i c\u00e1c thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m.\u00a0<\/span><\/li>\n<li><b>GitHub<\/b><span style=\"font-weight: 400;\">: GitHub l\u00e0 m\u1ed9t d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef kho l\u01b0u tr\u1eef Git d\u1ef1a tr\u00ean web, cung c\u1ea5p t\u1ea5t c\u1ea3 ch\u1ee9c n\u0103ng ki\u1ec3m so\u00e1t b\u1ea3n s\u1eeda \u0111\u1ed5i ph\u00e2n t\u00e1n v\u00e0 qu\u1ea3n l\u00fd m\u00e3 ngu\u1ed3n (SCM) c\u1ee7a Git c\u0169ng nh\u01b0 th\u00eam c\u00e1c t\u00ednh n\u0103ng ri\u00eang c\u1ee7a n\u00f3.<\/span><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><b>Git<\/b><\/td>\n<td><b>Github<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">L\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n \u0111\u1ec3 qu\u1ea3n l\u00fd l\u1ecbch s\u1eed m\u00e3 ngu\u1ed3n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u00e0 m\u1ed9t d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef cho kho l\u01b0u tr\u1eef Git<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">L\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u00e0 m\u1ed9t giao di\u1ec7n UI<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t c\u1ee5c b\u1ed9 tr\u00ean h\u1ec7 th\u1ed1ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean web<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c b\u1ea3o tr\u00ec b\u1edfi c\u1ed9ng \u0111\u1ed3ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Hi\u1ec7n \u0111ang \u0111\u01b0\u1ee3c s\u1edf h\u1eefu v\u00e0 ph\u00e1t tri\u1ec3n b\u1edfi Microsoft, nh\u01b0ng c\u1ed9ng \u0111\u1ed3ng v\u1eabn \u0111\u00f3ng g\u00f3p r\u1ea5t l\u1edbn<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u1eadp trung v\u00e0o ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n v\u00e0 chia s\u1ebb code<\/span><\/td>\n<td><span style=\"font-weight: 400;\">T\u1eadp trung v\u00e0o l\u01b0u tr\u1eef code v\u00e0 truy xu\u1ea5t t\u1eeb xa<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng c\u00f3 t\u00ednh n\u0103ng qu\u1ea3n l\u00fd ng\u01b0\u1eddi d\u00f9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 t\u00ednh n\u0103ng qu\u1ea3n l\u00fd ng\u01b0\u1eddi d\u00f9ng t\u00edch h\u1ee3p<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Cung c\u1ea5p m\u1ed9t giao di\u1ec7n Desktop c\u00f3 t\u00ean l\u00e0 Git Gui<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cung c\u1ea5p m\u1ed9t giao di\u1ec7n Desktop c\u00f3 t\u00ean l\u00e0 GitHub Desktop<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh tranh v\u1edbi CVS, Subversion, Mercurial,&#8230;<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh tranh v\u1edbi GitLab, Bit Bucket, AWS Codecommit, Azure DevOps Server,&#8230;<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/git-vs-github\/\" target=\"_blank\" rel=\"noopener\"><strong>Git vs GitHub: C\u00e1c \u0111i\u1ec3m kh\u00e1c nhau v\u00e0 C\u00e1ch k\u1ebft h\u1ee3p<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa MVC (Model View Controller) v\u00e0 MVP (Model View Presenter) l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<ul>\n<li><b>M\u00f4 h\u00ecnh MVC <\/b><span style=\"font-weight: 400;\">g\u1ee3i \u00fd chia code th\u00e0nh 3 th\u00e0nh ph\u1ea7n. Trong khi t\u1ea1o l\u1edbp\/t\u1ec7p c\u1ee7a \u1ee9ng d\u1ee5ng, l\u1eadp tr\u00ecnh vi\u00ean ph\u1ea3i ph\u00e2n lo\u1ea1i th\u00e0nh m\u1ed9t trong ba l\u1edbp g\u1ed3m: Model &#8211; Th\u00e0nh ph\u1ea7n n\u00e0y l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u1ee9ng d\u1ee5ng, View &#8211; L\u1edbp UI, Controller &#8211; Thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7 gi\u1eefa View v\u00e0 Model.<\/span><\/li>\n<li><b>M\u00f4 h\u00ecnh MVP<\/b><span style=\"font-weight: 400;\"> kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c nh\u1eefng th\u00e1ch th\u1ee9c c\u1ee7a MVC v\u00e0 cung c\u1ea5p c\u1ea5u tr\u00fac code d\u1ef1 \u00e1n. MVP g\u1ed3m ba th\u00e0nh ph\u1ea7n: Model &#8211; L\u1edbp l\u01b0u tr\u1eef d\u1eef li\u1ec7u, View &#8211; L\u1edbp UI v\u00e0 Presenter &#8211; L\u1ea5y d\u1eef li\u1ec7u t\u1eeb m\u00f4 h\u00ecnh v\u00e0 \u00e1p d\u1ee5ng logic UI \u0111\u1ec3 quy\u1ebft \u0111\u1ecbnh n\u1ed9i dung hi\u1ec3n th\u1ecb.<\/span><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><b>MVC<\/b><\/td>\n<td><b>MVP<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">M\u1ed9t trong nh\u1eefng ki\u1ebfn \u200b\u200btr\u00fac ph\u1ea7n m\u1ec1m l\u00e2u \u0111\u1eddi nh\u1ea5t<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1ee3c ph\u00e1t tri\u1ec3n nh\u01b0 l\u00e0 phi\u00ean b\u1ea3n th\u1ee9 hai c\u1ee7a MVC<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">UI (View) v\u00e0 c\u01a1 ch\u1ebf truy c\u1eadp d\u1eef li\u1ec7u (Model) \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p ch\u1eb7t ch\u1ebd<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 c\u00f3 View ph\u1ee5 thu\u1ed9c b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng Presenter l\u00e0m k\u00eanh giao ti\u1ebfp gi\u1eefa Model v\u00e0 View<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">&#8211; Controller v\u00e0 View t\u1ed3n t\u1ea1i v\u1edbi m\u1ed1i quan h\u1ec7 m\u1ed9t &#8211; nhi\u1ec1u<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; M\u1ed9t Controller c\u00f3 th\u1ec3 ch\u1ecdn m\u1ed9t View kh\u00e1c nhau d\u1ef1a tr\u00ean thao t\u00e1c c\u1ea7n thi\u1ebft<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1ed1i quan h\u1ec7 1 &#8211; 1 t\u1ed3n t\u1ea1i gi\u1eefa Presenter v\u00e0 View v\u00ec m\u1ed7i l\u1edbp Presenter qu\u1ea3n l\u00fd m\u1ed9t View t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">View kh\u00f4ng c\u00f3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 Controller<\/span><\/td>\n<td><span style=\"font-weight: 400;\">View c\u00f3 tham chi\u1ebfu \u0111\u1ebfn Presenter<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f3 th\u1ef1c hi\u1ec7n thay \u0111\u1ed5i v\u00e0 s\u1eeda \u0111\u1ed5i c\u00e1c t\u00ednh n\u0103ng c\u1ee7a \u1ee9ng d\u1ee5ng v\u00ec c\u00e1c l\u1edbp code \u0111\u01b0\u1ee3c li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00e1c l\u1edbp code \u0111\u01b0\u1ee3c li\u00ean k\u1ebft l\u1ecfng l\u1ebbo n\u00ean d\u1ec5 th\u1ef1c hi\u1ec7n s\u1eeda \u0111\u1ed5i\/thay \u0111\u1ed5i trong m\u00e3 \u1ee9ng d\u1ee5ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea7u v\u00e0o c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1edfi Controller<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ebf \u0111\u1ed9 View l\u00e0 \u0111i\u1ec3m v\u00e0o c\u1ee7a \u1ee9ng d\u1ee5ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 l\u00fd t\u01b0\u1edfng cho c\u00e1c d\u1ef1 \u00e1n quy m\u00f4 nh\u1ecf<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01a1n gi\u1ea3n v\u00e0 ph\u1ee9c t\u1ea1p<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3\u00a0 Unit Testing n\u1ebfu controller \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 th\u1ef1c hi\u1ec7n Unit Testing nh\u01b0ng li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd gi\u1eefa View v\u00e0 Presenter c\u00f3 th\u1ec3 g\u00e2y ra \u0111\u00f4i ch\u00fat kh\u00f3 kh\u0103n<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u00cdt ph\u1ee5 thu\u1ed9c v\u00e0o API Android<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o API Android<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng tu\u00e2n theo nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m \u0111\u01a1n l\u1ebb v\u00e0 theo m\u00f4-\u0111un<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tu\u00e2n theo nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m \u0111\u01a1n l\u1ebb v\u00e0 theo m\u00f4-\u0111un<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Cau_hoi_phong_van_Fullstack_Developer_voi_Senior_Fullstack_Developer\"><\/span><b>C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer v\u1edbi Senior Fullstack Developer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ki\u1ec3m so\u00e1t session state trong load balancer?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Trong m\u1ed9t k\u1ecbch b\u1ea3n \u1ee9ng d\u1ee5ng load balancer, v\u1ea5n \u0111\u1ec1 ch\u00ednh v\u1edbi session state l\u00e0 n\u1ebfu h\u1ec7 th\u1ed1ng pbackend \u0111ang x\u1eed l\u00fd d\u1eef li\u1ec7u phi\u00ean trong b\u1ed9 nh\u1edb, th\u00ec c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo t\u1eeb c\u00f9ng m\u1ed9t m\u00e1y kh\u00e1ch c\u1ea7n ph\u1ea3i \u0111\u1ebfn c\u00f9ng m\u1ed9t m\u00e1y ch\u1ee7, n\u1ebfu kh\u00f4ng d\u1eef li\u1ec7u phi\u00ean s\u1ebd b\u1ecb ph\u00e2n m\u1ea3nh v\u00e0 v\u00f4 d\u1ee5ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 hai c\u00e1ch ch\u00ednh \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Phi\u00ean c\u1ed1 \u0111\u1ecbnh (Sticky sessions):<\/b><span style=\"font-weight: 400;\"> Cho ph\u00e9p \u0111\u1ecbnh c\u1ea5u h\u00ecnh load balancer \u0111\u1ec3 chuy\u1ec3n h\u01b0\u1edbng c\u00e1c y\u00eau c\u1ea7u t\u1eeb c\u00f9ng m\u1ed9t m\u00e1y kh\u00e1ch v\u00e0o c\u00f9ng m\u1ed9t m\u00e1y ch\u1ee7 m\u1ecdi l\u00fac.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u01b0u tr\u1eef phi\u00ean t\u1eadp trung (Centralized session store):<\/b><span style=\"font-weight: 400;\"> Gi\u1ea3i ph\u00e1p n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u0111\u01b0a d\u1eef li\u1ec7u phi\u00ean ra kh\u1ecfi c\u00e1c backend v\u00e0o m\u1ed9t kho d\u1eef li\u1ec7u t\u1eadp trung m\u00e0 t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n sao c\u00f3 th\u1ec3 truy c\u1eadp. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ed9 load balancer ho\u1ea1t \u0111\u1ed9ng d\u1ec5 d\u00e0ng h\u01a1n, nh\u01b0ng \u0111\u00f2i h\u1ecfi logic b\u1ed5 sung v\u00e0 nhi\u1ec1u &#8220;b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng&#8221; h\u01a1n.<\/span><\/li>\n<\/ul>\n<h3><b>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa tr\u00ecnh l\u1eb7p Fail-Fast v\u00e0 Fail-Safe l\u00e0 g\u00ec?<\/b><i><\/i><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Fail-Fast<\/b><\/td>\n<td><b>Fail-Safe<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">D\u1eebng l\u1eb7p l\u1ea1i v\u00e0 \u0111\u01b0a ra ngo\u1ea1i l\u1ec7 n\u1ebfu c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u01a1 b\u1ea3n b\u1ecb thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">V\u1eabn ti\u1ebfp t\u1ee5c x\u1eed l\u00fd ngay c\u1ea3 khi c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u01a1 b\u1ea3n b\u1ecb thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh l\u1eb7p<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c sao ch\u00e9p kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea1o ra trong qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1ed9t b\u1ea3n sao ho\u1eb7c \u0111\u1ed1i t\u01b0\u1ee3ng sao ch\u00e9p \u0111\u01b0\u1ee3c t\u1ea1o ra<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng cho ph\u00e9p b\u1ea5t k\u1ef3 s\u1eeda \u0111\u1ed5i n\u00e0o trong qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i<\/span><\/td>\n<td><span style=\"font-weight: 400;\"> Cho ph\u00e9p s\u1eeda \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Nhanh h\u01a1n Fail Safe Iterator<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1eadm h\u01a1n Fail Fast<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Deadlock trong Java l\u00e0 g\u00ec v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 tr\u00e1nh n\u00f3 x\u1ea3y ra?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Deadlock l\u00e0 t\u00ecnh hu\u1ed1ng trong Java khi hai ho\u1eb7c nhi\u1ec1u lu\u1ed3ng \u0111ang c\u1ed1 g\u1eafng truy c\u1eadp c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c khi ch\u00fang c\u1ed1 g\u1eafng truy c\u1eadp c\u00e1c t\u00e0i nguy\u00ean kh\u00e1c nhau theo m\u1ed9t th\u1ee9 t\u1ef1 nh\u1ea5t \u0111\u1ecbnh. T\u00ecnh hu\u1ed1ng n\u00e0y ch\u1ec9 x\u1ea3y ra trong tr\u01b0\u1eddng h\u1ee3p \u0111a lu\u1ed3ng. C\u00f3 th\u1ec3 tr\u00e1nh deadlock b\u1eb1ng c\u00e1c c\u00e1ch sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tr\u00e1nh kh\u00f3a l\u1ed3ng nhau (nested locks): <\/b><span style=\"font-weight: 400;\">Tr\u00e1nh c\u1ea5p kh\u00f3a cho nhi\u1ec1u lu\u1ed3ng n\u1ebfu ch\u00fang ta \u0111\u00e3 c\u1ea5p cho m\u1ed9t lu\u1ed3ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng th\u1eddi gian ch\u1edd kh\u00f3a (lock timeouts): <\/b><span style=\"font-weight: 400;\">Ch\u00fang ta c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh th\u1eddi gian cho m\u1ed9t lu\u1ed3ng \u0111\u1ec3 ng\u0103n lu\u1ed3ng \u0111\u00f3 ph\u1ea3i ch\u1edd kh\u00f3a v\u00f4 th\u1eddi h\u1ea1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tr\u00e1nh kh\u00f3a kh\u00f4ng c\u1ea7n thi\u1ebft: <\/b><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng kh\u00f3a kh\u00f4ng c\u1ea7n thi\u1ebft c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn b\u1ebf t\u1eafc v\u00e0 ch\u00fang ta n\u00ean tr\u00e1nh t\u00ecnh tr\u1ea1ng n\u00e0y.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng kh\u00f3a leo thang (lock escalation): <\/b><span style=\"font-weight: 400;\">Kh\u00f3a leo thang (lock escalation) gi\u00fap chuy\u1ec3n \u0111\u1ed5i nhi\u1ec1u kh\u00f3a th\u00e0nh \u00edt kh\u00f3a h\u01a1n, gi\u1ea3m nguy c\u01a1 x\u1ea3y ra b\u1ebf t\u1eafc.<\/span><\/li>\n<\/ul>\n<h3><b>H\u00e3y n\u00eau m\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ec3 c\u1ea3i thi\u1ec7n performance c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng web<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng web ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1. C\u00f3 r\u1ea5t nhi\u1ec1u c\u00e1ch v\u00e0 k\u1ef9 thu\u1eadt c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m trang web ho\u1ea1t \u0111\u1ed9ng nhanh h\u01a1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m &amp; m\u1ea1ng ph\u00e2n ph\u1ed1i n\u1ed9i dung<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1ea3m thi\u1ec3u c\u00e1c y\u00eau c\u1ea7u HTTP<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u1ea1n ch\u1ebf chuy\u1ec3n h\u01b0\u1edbng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u1eadt n\u00e9n (compression)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u1ed1i \u01b0u ho\u00e1 d\u1eef li\u1ec7u<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u1ed1i \u01b0u h\u00f3a HTML, CSS and JavaScript<\/span><\/li>\n<\/ul>\n<h3><b>B\u1ea1n s\u1ebd s\u1eed d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c n\u00e0o \u0111\u1ec3 qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i c\u01a1 s\u1edf d\u1eef li\u1ec7u trong t\u00ecnh hu\u1ed1ng t\u1ea3i cao (high-load)?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">Trong t\u00ecnh hu\u1ed1ng t\u1ea3i cao (high-load), c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c c\u00e1ch sau \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a k\u1ebft n\u1ed1i c\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng nh\u00f3m k\u1ebft n\u1ed1i \u0111\u1ec3 t\u00e1i s\u1eed d\u1ee5ng c\u00e1c k\u1ebft n\u1ed1i gi\u00fap gi\u1ea3m th\u1eddi gian thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i m\u1edbi.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2n b\u1eb1ng t\u1ea3i l\u01b0u l\u01b0\u1ee3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u (c\u00e1c truy v\u1ea5n) gi\u1eefa m\u1ed9t nh\u00f3m c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1ebd gi\u00fap ph\u00e2n ph\u1ed1i t\u1ea3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ngay c\u1ea3 vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a c\u00e1c truy v\u1ea5n c\u0169ng c\u00f3 th\u1ec3 gi\u1ea3m th\u1eddi gian b\u1ea1n s\u1eed d\u1ee5ng m\u1ed7i k\u1ebft n\u1ed1i, gi\u00fap t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean v\u00e0 gi\u1ea3m thi\u1ec3u th\u1eddi gian d\u00e0nh cho m\u1ed7i k\u1ebft n\u1ed1i \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/span><\/li>\n<\/ul>\n<h3><b>H\u00e3y gi\u1ea3i th\u00edch c\u00e1ch s\u1eed d\u1ee5ng v\u00e0 l\u1ee3i \u00edch c\u1ee7a h\u00e0ng \u0111\u1ee3i tin nh\u1eafn trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n (distributed system)<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">H\u00e0ng \u0111\u1ee3i tin nh\u1eafn trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a ki\u1ebfn \u200b\u200btr\u00fac ph\u1ea3n \u1ee9ng (reactive architecture). M\u1ed7i d\u1ecbch v\u1ee5 c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t v\u00e0 l\u1eafng nghe c\u00e1c s\u1ef1 ki\u1ec7n \u0111\u1ebfn t\u1eeb h\u00e0ng \u0111\u1ee3i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Theo c\u00e1ch \u0111\u00f3, khi c\u00e1c s\u1ef1 ki\u1ec7n \u0111\u1ebfn, c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00f3 c\u00f3 th\u1ec3 ph\u1ea3n \u1ee9ng v\u1edbi ch\u00fang m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i ch\u1ee7 \u0111\u1ed9ng th\u0103m d\u00f2 c\u00e1c d\u1ecbch v\u1ee5 kh\u00e1c \u0111\u1ec3 ph\u1ea3n h\u1ed3i.<\/span><i><\/i><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-83060 aligncenter\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro.png\" alt=\"c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n fullstack developer - itviec blog\" width=\"2048\" height=\"1046\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro.png 2048w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-300x153.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-640x327.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-200x102.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-768x392.png 768w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-1536x785.png 1536w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-100x51.png 100w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-700x358.png 700w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-1-vippro-1600x817.png 1600w\" sizes=\"auto, (max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 b\u1ea3o v\u1ec7 server kh\u1ecfi cu\u1ed9c t\u1ea5n c\u00f4ng t\u1eeb SQL injection?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">SQL injection c\u00f3 th\u1ec3 ph\u00e1 h\u1ee7y c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch th\u00eam m\u00e3 \u0111\u1ed9c ho\u1eb7c hack c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch th\u00eam m\u00e3 v\u00e0o c\u00e1c c\u00e2u query. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra v\u00ec c\u00f3 r\u1ea5t \u00edt s\u1ef1 t\u00e1ch bi\u1ec7t gi\u1eefa m\u00e3 ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. SQL injection l\u00e0 m\u1ed9t lo\u1ea1i t\u1ea5n c\u00f4ng ph\u1ed5 bi\u1ebfn v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 ng\u0103n ch\u1eb7n t\u1ea5n c\u00f4ng b\u1eb1ng c\u00e1ch s\u1eed\u00a0<\/span><span style=\"font-weight: 400;\">d\u1ee5ng c\u00e1c c\u00e2u l\u1ec7nh chu\u1ea9n b\u1ecb (Prepared statements) v\u00e0 c\u00e1c tham s\u1ed1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 Java v\u1edbi JDBC:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">PreparedStatement stmt = conn.prepareStatement(\"SELECT * FROM users WHERE username = ?\");<\/span>\r\n\r\n<span style=\"font-weight: 400;\">stmt.setString(1, username);<\/span>\r\n\r\n<span style=\"font-weight: 400;\">ResultSet rs = stmt.executeQuery(); 1<\/span><\/pre>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00f3 c\u00e1c th\u1ee7 t\u1ee5c \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00f3 quy tr\u00ecnh x\u00e1c th\u1ef1c cho d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o, theo \u0111\u00f3 b\u1ea1n c\u00f3 th\u1ec3 \u0111\u01b0a d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0o danh s\u00e1ch \u0111en ho\u1eb7c danh s\u00e1ch tr\u1eafng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng nguy\u00ean t\u1eafc \u0111\u1eb7c quy\u1ec1n t\u1ed1i thi\u1ec3u, t\u1ee9c l\u00e0 kh\u00f4ng cung c\u1ea5p quy\u1ec1n truy c\u1eadp lo\u1ea1i qu\u1ea3n tr\u1ecb vi\u00ean cao c\u1ea5p v\u00e0o m\u00e1y ch\u1ee7 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f4ng khai. Do \u0111\u00f3, ngay c\u1ea3 khi tin t\u1eb7c c\u00f3 th\u1ec3 hack v\u00e0o \u1ee9ng d\u1ee5ng, c\u0169ng kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00ec ch\u00fang s\u1ebd kh\u00f4ng \u0111\u1ee7 quy\u1ec1n \u0111\u1ec3 th\u1ef1c thi.<\/span><\/li>\n<\/ul>\n<h3><b>B\u1ea1n s\u1ebd thi\u1ebft l\u1eadp quy tr\u00ecnh t\u00edch h\u1ee3p li\u00ean t\u1ee5c\/tri\u1ec3n khai li\u00ean t\u1ee5c (CI\/CD) cho c\u00e1c d\u1ecbch v\u1ee5 backend nh\u01b0 th\u1ebf n\u00e0o?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00f3 nhi\u1ec1u c\u00e2n nh\u1eafc khi thi\u1ebft l\u1eadp quy tr\u00ecnh t\u00edch h\u1ee3p li\u00ean t\u1ee5c\/tri\u1ec3n khai li\u00ean t\u1ee5c (CI\/CD) cho c\u00e1c d\u1ecbch v\u1ee5 backend:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng GIT<\/b><span style=\"font-weight: 400;\"> l\u00e0m tr\u00ecnh k\u00edch ho\u1ea1t cho to\u00e0n b\u1ed9 quy tr\u00ecnh. C\u00e1c \u0111\u01b0\u1eddng \u1ed1ng (pipelines) x\u00e2y d\u1ef1ng cho c\u00e1c d\u1ecbch v\u1ee5 backend s\u1ebd \u0111\u01b0\u1ee3c th\u1ef1c thi khi b\u1ea1n \u0111\u1ea9y code v\u00e0o m\u1ed9t nh\u00e1nh c\u1ee5 th\u1ec3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ch\u1ecdn \u0111\u00fang n\u1ec1n t\u1ea3ng CI\/CD<\/b><span style=\"font-weight: 400;\"> cho nhu c\u1ea7u c\u1ee7a b\u1ea1n nh\u01b0 GitHub Actions, GitLab CI\/CD, CircleCI,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u0110\u1ea3m b\u1ea3o c\u00e1c b\u00e0i unit testing t\u1ef1 \u0111\u1ed9ng<\/b><span style=\"font-weight: 400;\"> \u0111\u01b0\u1ee3c th\u1ef1c thi b\u00ean trong c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vi\u1ec7c tri\u1ec3n khai t\u1ef1 \u0111\u1ed9ng ch\u1ec9 n\u00ean di\u1ec5n ra n\u1ebfu t\u1ea5t c\u1ea3 b\u00e0i ki\u1ec3m tra \u0111\u01b0\u1ee3c th\u1ef1c thi th\u00e0nh c\u00f4ng. N\u1ebfu kh\u00f4ng, \u0111\u01b0\u1eddng \u1ed1ng s\u1ebd b\u1ecb l\u1ed7i, ng\u0103n kh\u00f4ng cho m\u00e3 b\u1ecb h\u1ecfng ti\u1ebfp c\u1eadn b\u1ea5t k\u1ef3 m\u00f4i tr\u01b0\u1eddng n\u00e0o.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng kho l\u01b0u tr\u1eef hi\u1ec7n v\u1eadt <\/b><span style=\"font-weight: 400;\">nh\u01b0 JFrog Artifactory ho\u1eb7c Nexus Repository \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00e3 x\u00e2y d\u1ef1ng th\u00e0nh c\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e2n nh\u1eafc thi\u1ebft l\u1eadp chi\u1ebfn l\u01b0\u1ee3c kh\u00f4i ph\u1ee5c trong tr\u01b0\u1eddng h\u1ee3p c\u00f3 s\u1ef1 c\u1ed1 x\u1ea3y ra v\u00e0 phi\u00ean b\u1ea3n tri\u1ec3n khai cu\u1ed1i c\u00f9ng c\u1ee7a d\u1ecbch v\u1ee5 b\u1ecb h\u1ecfng.<\/span><\/li>\n<\/ul>\n<h3><b>B\u1ea1n s\u1ebd l\u00e0m g\u00ec \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c quy tr\u00ecnh ch\u1ea1y l\u00e2u (long-running processes) trong c\u00e1c y\u00eau c\u1ea7u web?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ed1i v\u1edbi c\u00e1c y\u00eau c\u1ea7u web k\u00edch ho\u1ea1t quy tr\u00ecnh ch\u1ea1y l\u00e2u (long-running processes), t\u00f9y ch\u1ecdn t\u1ed1t nh\u1ea5t l\u00e0 tri\u1ec3n khai ki\u1ebfn \u200b\u200btr\u00fac ph\u1ea3n \u1ee9ng (reactive architecture). \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 khi m\u1ed9t d\u1ecbch v\u1ee5 nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, n\u00f3 s\u1ebd chuy\u1ec3n \u0111\u1ed5i y\u00eau c\u1ea7u \u0111\u00f3 th\u00e0nh m\u1ed9t th\u00f4ng b\u00e1o b\u00ean trong h\u00e0ng \u0111\u1ee3i th\u00f4ng b\u00e1o v\u00e0 quy tr\u00ecnh ch\u1ea1y l\u00e2u s\u1ebd nh\u1eadn y\u00eau c\u1ea7u \u0111\u00f3 b\u1ea5t c\u1ee9 khi n\u00e0o n\u00f3 s\u1eb5n s\u00e0ng th\u1ef1c hi\u1ec7n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong khi \u0111\u00f3, m\u00e1y kh\u00e1ch g\u1eedi y\u00eau c\u1ea7u n\u00e0y s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i ngay l\u1eadp t\u1ee9c x\u00e1c nh\u1eadn r\u1eb1ng y\u00eau c\u1ea7u \u0111ang \u0111\u01b0\u1ee3c x\u1eed l\u00fd. B\u1ea3n th\u00e2n m\u00e1y kh\u00e1ch c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi h\u00e0ng \u0111\u1ee3i th\u00f4ng b\u00e1o (ho\u1eb7c th\u00f4ng qua proxy) v\u00e0 ch\u1edd s\u1ef1 ki\u1ec7n &#8220;s\u1eb5n s\u00e0ng&#8221; v\u1edbi t\u1ea3i tr\u1ecdng c\u1ee7a n\u00f3 b\u00ean trong.<\/span><i><\/i><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-83061\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro.png\" alt=\"c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n fullstack developer - itviec blog\" width=\"2048\" height=\"1046\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro.png 2048w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-300x153.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-640x327.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-200x102.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-768x392.png 768w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-1536x785.png 1536w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-100x51.png 100w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-700x358.png 700w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-fullstack-developer-2-vippro-1600x817.png 1600w\" sizes=\"auto, (max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<h3><b>B\u1ea1n \u0111\u00e3 qu\u1ea3n l\u00fd c\u00e1c ph\u1ee5 thu\u1ed9c API trong c\u00e1c h\u1ec7 th\u1ed1ng backend nh\u01b0 th\u1ebf n\u00e0o?<\/b><i><\/i><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1ch tuy\u1ec7t v\u1eddi \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c ph\u1ee5 thu\u1ed9c API trong c\u00e1c h\u1ec7 th\u1ed1ng backend l\u00e0 t\u1eadn d\u1ee5ng phi\u00ean b\u1ea3n API. Th\u00f4ng qua th\u1ef1c h\u00e0nh \u0111\u01a1n gi\u1ea3n n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ec7 th\u1ed1ng h\u1ef1c s\u1ef1 \u0111ang s\u1eed d\u1ee5ng \u0111\u00fang API, ngay c\u1ea3 khi c\u00f3 nhi\u1ec1u phi\u00ean b\u1ea3n c\u1ee7a API \u0111\u00f3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec1u n\u00e0y c\u0169ng cho ph\u00e9p c\u00f3 nhi\u1ec1u h\u1ec7 th\u1ed1ng backend s\u1eed d\u1ee5ng c\u00e1c phi\u00ean b\u1ea3n kh\u00e1c nhau c\u1ee7a c\u00f9ng m\u1ed9t API m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 r\u1ee7i ro n\u00e0o v\u1ec1 s\u1ef1 nh\u1ea5t qu\u00e1n ho\u1eb7c c\u00e1c b\u1ea3n c\u1eadp nh\u1eadt l\u00e0m h\u1ecfng h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<h3><b>B\u1ea1n s\u1ebd thi\u1ebft k\u1ebf backend \u0111\u1ec3 h\u1ed7 tr\u1ee3 \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u theo th\u1eddi gian th\u1ef1c tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb nh\u01b0 th\u1ebf n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">N\u1ebfu mu\u1ed1n h\u1ed7 tr\u1ee3 \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u theo th\u1eddi gian th\u1ef1c, c\u1ea7n ph\u1ea3i t\u00ecm c\u00e1ch t\u1ea1o k\u00eanh giao ti\u1ebfp \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u qu\u1ea3 gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb, \u0111\u1ed3ng th\u1eddi t\u00ecm c\u00e1ch gi\u1ea3i quy\u1ebft xung \u0111\u1ed9t \u0111\u1ed3ng b\u1ed9 d\u1eef li\u1ec7u ti\u1ec1m \u1ea9n khi nhi\u1ec1u thi\u1ebft b\u1ecb \u0111ang c\u1ed1 g\u1eafng thay \u0111\u1ed5i c\u00f9ng m\u1ed9t b\u1ea3n ghi. V\u00ec v\u1eady, \u0111\u1ed1i v\u1edbi c\u00e1c k\u00eanh giao ti\u1ebfp, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t trong c\u00e1c ph\u01b0\u01a1ng ph\u00e1p sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">K\u00eanh song h\u01b0\u1edbng d\u1ef1a tr\u00ean socket cho ph\u00e9p trao \u0111\u1ed5i d\u1eef li\u1ec7u theo th\u1eddi gian th\u1ef1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng m\u00f4 h\u00ecnh pub\/sub \u0111\u1ec3 ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 gi\u1eefa nhi\u1ec1u thi\u1ebft b\u1ecb.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n nh\u01b0 chuy\u1ec3n \u0111\u1ed5i ho\u1ea1t \u0111\u1ed9ng (OT) ho\u1eb7c ki\u1ec3u d\u1eef li\u1ec7u sao ch\u00e9p kh\u00f4ng xung \u0111\u1ed9t (CRDT).<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket_cau_hoi_phong_van_Fullstack_Developer\"><\/span><b>T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">V\u1edbi 35+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao, t\u1eeb l\u00fd thuy\u1ebft \u0111\u1ebfn th\u1ef1c h\u00e0nh, x\u1eed l\u00fd t\u00ecnh hu\u1ed1ng b\u00ean tr\u00ean, ITviec mong r\u1eb1ng b\u1ea1n s\u1ebd c\u00f3 m\u1ed9t bu\u1ed5i th\u1ec3 hi\u1ec7n th\u1eadt t\u1ed1t v\u1edbi nh\u00e0 tuy\u1ec3n d\u1ee5ng. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u1edbi v\u1ecb tr\u00ed Fullstack Developer, b\u1ea1n s\u1ebd ph\u1ee5 tr\u00e1ch c\u1ea3 m\u1ea3ng Frontend (UX\/UI, flow) v\u00e0 Backend (database, API) c\u1ee7a trang web ho\u1eb7c \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi b\u1ea1n v\u1eeba ph\u1ea3i c\u00f3 ki\u1ebfn th\u1ee9c chuy\u00ean s\u00e2u c\u1ea3 2 m\u1ea3ng, v\u1eeba nh\u1ea1y b\u00e9n \u1ee9ng bi\u1ebfn linh ho\u1ea1t v\u1edbi t\u1eebng c\u00f4ng c\u1ee5 l\u1eadp tr\u00ecnh. Trong b\u00e0i vi\u1ebft [&hellip;]<\/p>\n","protected":false},"author":213,"featured_media":83062,"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-82654","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 v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Top 35+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer ph\u1ed5 bi\u1ebfn - ITviec Blog<\/title>\n<meta name=\"description\" content=\"L\u01b0u ngay c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer th\u01b0\u1eddng g\u1eb7p, bao g\u1ed3m c\u00e2u h\u1ecfi Frontend (UX\/UI, flow), Backend (database, API) v\u00e0 t\u00ecnh hu\u1ed1ng.\" \/>\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-fullstack-developer\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 35+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer ph\u1ed5 bi\u1ebfn\" \/>\n<meta property=\"og:description\" content=\"V\u1edbi v\u1ecb tr\u00ed Fullstack Developer, b\u1ea1n s\u1ebd ph\u1ee5 tr\u00e1ch c\u1ea3 m\u1ea3ng Frontend (UX\/UI, flow) v\u00e0 Backend (database, API) c\u1ee7a trang web ho\u1eb7c \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-fullstack-developer\/\" \/>\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=\"2024-12-19T03:58:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-Fullstack-Developer-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 35+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Fullstack Developer ph\u1ed5 bi\u1ebfn - 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