{"id":15280,"date":"2020-03-17T14:53:01","date_gmt":"2020-03-17T07:53:01","guid":{"rendered":"https:\/\/kiencang.net\/?p=15280"},"modified":"2020-03-17T14:53:01","modified_gmt":"2020-03-17T07:53:01","slug":"javascript-ben-thu-ba","status":"publish","type":"post","link":"https:\/\/kiencang.net\/javascript-ben-thu-ba\/","title":{"rendered":"V\u1ea5n \u0111\u1ec1 t\u1ed1c \u0111\u1ed9 c\u1ee7a JavaScript t\u1eeb b\u00ean th\u1ee9 ba"},"content":{"rendered":"\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta c\u00f9ng t\u00ecm hi\u1ec3u \u1ea3nh h\u01b0\u1edfng c\u1ee7a JavaScript b\u00ean th\u1ee9 ba l\u00ean t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t c\u1ee7a website v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m g\u00ec \u0111\u1ec3 tr\u00e1nh c\u00e1c m\u00e3 n\u00e0y <a href=\"https:\/\/kiencang.net\/website-cham\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u00e0m ch\u1eadm website c\u1ee7a b\u1ea1n<\/a>.<\/p>\n\n\n<p>JavaScript c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u01b0\u1ee3c nh\u00fang v\u00e0o trong website c\u1ee7a b\u1ea1n, ch\u00fang l\u00e0:<\/p>\n\n\n<ul><li>C\u00e1c m\u00e3 m\u00e0 b\u1ea1n kh\u00f4ng ph\u1ea3i l\u00e0 t\u00e1c gi\u1ea3 (not authored);<\/li><li>\u0110\u01b0\u1ee3c ph\u1ee5c v\u1ee5 t\u1eeb c\u00e1c m\u00e1y ch\u1ee7 c\u1ee7a b\u00ean th\u1ee9 ba (third-party servers);<\/li><\/ul>\n\n\n<p>C\u00e1c website s\u1eed d\u1ee5ng c\u00e1c \u0111o\u1ea1n m\u00e3 n\u00e0y cho nhi\u1ec1u m\u1ee5c \u0111\u00edch kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n\n\n<ul><li>C\u00e1c n\u00fat chia s\u1ebb m\u1ea1ng x\u00e3 h\u1ed9i;<\/li><li>C\u00e1c <a href=\"https:\/\/kiencang.net\/youtube-tai-nang-nhu-the-nao\/\">video \u0111\u01b0\u1ee3c nh\u00fang v\u00e0o<\/a>;<\/li><li>D\u1ecbch v\u1ee5 chat;<\/li><li>C\u00e1c iframe qu\u1ea3ng c\u00e1o;<\/li><li>C\u00e1c m\u00e3 ph\u00e2n t\u00edch v\u00e0 \u0111o l\u01b0\u1eddng;<\/li><li>C\u00e1c m\u00e3 ki\u1ec3m tra A\/B ph\u00e2n t\u00edch tr\u1ea3i nghi\u1ec7m th\u1ef1c t\u1ebf c\u1ee7a ng\u01b0\u1eddi d\u00f9ng;<\/li><li>C\u00e1c th\u01b0 vi\u1ec7n h\u1ed7 tr\u1ee3 (ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ecbnh d\u1ea1ng ng\u00e0y th\u00e1ng, \u1ea3nh \u0111\u1ed9ng, v\u00e0 c\u00e1c th\u01b0 vi\u1ec7n ch\u1ee9c n\u0103ng);<\/li><li>V\u00e2n v\u00e2n &amp; m\u00e2y m\u00e2y.<\/li><\/ul>\n\n\n<figure class=\"wp-block-video\"><video autoplay loop muted src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/ma-nhung-ben-thu-ba.mp4\" playsinline><\/video><\/figure>\n\n\n<p>C\u00e1c m\u00e3 c\u1ee7a b\u00ean th\u1ee9 ba c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c ch\u1ee9c n\u0103ng \u0111\u1ea7y s\u1ee9c m\u1ea1nh, nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 c\u00e2u chuy\u1ec7n. Ch\u00fang c\u0169ng c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 quy\u1ec1n ri\u00eang t\u01b0, b\u1ea3o m\u1eadt v\u00e0 h\u00e0nh vi c\u1ee7a trang- v\u00e0 ch\u00fang c\u00f3 th\u1ec3 g\u1eb7p c\u00e1c v\u1ea5n \u0111\u1ec1 nghi\u00eam tr\u1ecdng v\u1ec1 hi\u1ec7u su\u1ea5t.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/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\" role=\"button\"><label for=\"item-6577d6d0c4dd9\" ><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><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6d0c4dd9\"  type=\"checkbox\" id=\"item-6577d6d0c4dd9\"><\/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:\/\/kiencang.net\/javascript-ben-thu-ba\/#Hieu_suat_toc_do\" title=\"Hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9\">Hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/javascript-ben-thu-ba\/#Mang\" title=\"M\u1ea1ng\">M\u1ea1ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/javascript-ben-thu-ba\/#Ket_xuat\" title=\"K\u1ebft xu\u1ea5t\">K\u1ebft xu\u1ea5t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/javascript-ben-thu-ba\/#Ban_phai_lam_gi\" title=\"B\u1ea1n ph\u1ea3i l\u00e0m g\u00ec?\">B\u1ea1n ph\u1ea3i l\u00e0m g\u00ec?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Hieu_suat_toc_do\"><\/span>Hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>B\u1ea5t k\u1ef3 m\u1ed9t l\u01b0\u1ee3ng JavaScript \u0111\u00e1ng k\u1ec3 n\u00e0o c\u0169ng c\u00f3 th\u1ec3 l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 c\u1ee7a website. Nh\u01b0ng JavaScript c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng n\u1eb1m ngo\u00e0i t\u1ea7m ki\u1ec3m so\u00e1t c\u1ee7a b\u1ea1n, n\u00f3 c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 kh\u00e1c n\u1eefa.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mang\"><\/span>M\u1ea1ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i b\u1ea3o m\u1eadt t\u1ed1n th\u1eddi gian, v\u00e0 g\u1eedi qu\u00e1 nhi\u1ec1u y\u00eau c\u1ea7u t\u1edbi nhi\u1ec1u m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m ch\u1eadm trang. Th\u1eddi gian n\u00e0y th\u1eadm ch\u00ed d\u00e0i h\u01a1n khi ph\u1ea3i thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i b\u1ea3o m\u1eadt, c\u00e1i c\u00f3 th\u1ec3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c <a href=\"https:\/\/kiencang.net\/toi-thieu-thoi-gian-tra-cuu-dns\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u00ecm ki\u1ebfm DNS<\/a>, chuy\u1ec3n h\u01b0\u1edbng, v\u00e0 m\u1ed9t s\u1ed1 v\u00f2ng kh\u1ee9 h\u1ed3i (round trips) t\u1edbi m\u00e1y ch\u1ee7 cu\u1ed1i c\u00f9ng \u0111\u1ec3 x\u1eed l\u00fd y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n<p>C\u00e1c m\u00e3 JavaScript c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng b\u1ed5 sung th\u00eam c\u00e1c v\u1ea5n \u0111\u1ec1 m\u1ea1ng ng\u1ea7m \u1ea9n nh\u01b0:<\/p>\n\n\n<ul><li>T\u0103ng m\u1ea1nh c\u00e1c y\u00eau c\u1ea7u m\u1ea1ng b\u1ed5 sung;<\/li><li>K\u00e9o v\u1ec1 c\u00e1c \u1ea3nh v\u00e0 video ch\u01b0a \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a;<\/li><li><a href=\"https:\/\/kiencang.net\/tim-hieu-http-caching\/\" target=\"_blank\" rel=\"noreferrer noopener\">HTTP caching<\/a> kh\u00f4ng \u0111\u1ee7, c\u00e1i c\u00f3 th\u1ec3 b\u1eaft bu\u1ed9c b\u1ea1n ph\u1ea3i t\u00ecm n\u1ea1p th\u01b0\u1eddng xuy\u00ean c\u00e1c t\u00e0i nguy\u00ean m\u1ea1ng;<\/li><li>N\u00e9n m\u00e1y ch\u1ee7 kh\u00f4ng \u0111\u1ee7 cho c\u00e1c t\u00e0i nguy\u00ean;<\/li><li>Nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p c\u00e1c frameworks v\u00e0 th\u01b0 vi\u1ec7n \u0111\u01b0\u1ee3c k\u00e9o v\u1ec1 b\u1edfi nhi\u1ec1u m\u00e3 nh\u00fang c\u1ee7a b\u00ean th\u1ee9 ba kh\u00e1c;<\/li><\/ul>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ket_xuat\"><\/span>K\u1ebft xu\u1ea5t<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1ch JavaScript c\u1ee7a b\u00ean th\u1ee9 ba t\u1ea3i v\u1ec1 g\u1eb7p r\u1ea5t nhi\u1ec1u v\u1ea5n \u0111\u1ec1. N\u1ebfu n\u00f3 \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u1ed3ng b\u1ed9 trong <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\" target=\"_blank\" rel=\"noreferrer noopener\">tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng<\/a>, n\u00f3 s\u1ebd l\u00e0m tr\u00ec ho\u00e3n ph\u00e2n t\u00edch c\u00fa ph\u00e1p ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a t\u00e0i li\u1ec7u (html \/ css).<\/p>\n\n\n<p><strong>Thu\u1eadt ng\u1eef quan tr\u1ecdng<\/strong>: Tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng bao g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i nguy\u00ean m\u00e0 tr\u00ecnh duy\u1ec7t c\u1ea7n \u0111\u1ec3 hi\u1ec3n th\u1ecb n\u1ed9i dung thu\u1ed9c <a href=\"https:\/\/kiencang.net\/man-hinh-dau-tien\/\" target=\"_blank\" rel=\"noreferrer noopener\">m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean (above the fold)<\/a>.<\/p>\n\n\n<p>N\u1ebfu t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba g\u1eb7p v\u1ea5n \u0111\u1ec1 m\u00e1y ch\u1ee7 v\u00e0 g\u1eb7p l\u1ed7i khi ph\u00e2n ph\u1ed1i m\u1ed9t t\u00e0i nguy\u00ean n\u00e0o \u0111\u00f3, <a href=\"https:\/\/kiencang.net\/cach-trang-web-tai-va-hien-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">qu\u00e1 tr\u00ecnh render (k\u1ebft xu\u1ea5t)<\/a> s\u1ebd b\u1ecb ch\u1eb7n cho \u0111\u1ebfn khi y\u00eau c\u1ea7u b\u1ecb &#8216;time out&#8217;, c\u00e1i c\u00f3 th\u1ec3 k\u00e9o d\u00e0i trong kho\u1ea3ng t\u1eeb 10 t\u1edbi 80 gi\u00e2y. B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra v\u00e0 m\u00f4 ph\u1ecfng v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng <a href=\"https:\/\/css-tricks.com\/use-webpagetest-api\/#single-point-of-failure\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00f4ng c\u1ee5 ki\u1ec3m tra c\u1ee7a WebPageTest chuy\u00ean cho v\u1ea5n \u0111\u1ec1 \u0111i\u1ec3m l\u1ed7i duy nh\u1ea5t<\/a> (single-point-of-failure).<\/p>\n\n\n<p><strong>L\u01b0u \u00fd<\/strong>: <a href=\"https:\/\/developers.google.com\/web\/fundamentals\/performance\/optimizing-content-efficiency\/loading-third-party-javascript\/#ab_test_smaller_samples_of_users\" target=\"_blank\" rel=\"noreferrer noopener\">C\u00e1c m\u00e3 ki\u1ec3m tra A\/B<\/a> c\u0169ng th\u01b0\u1eddng c\u00f3 th\u1ec3 l\u00e0m tr\u00ec ho\u00e3n k\u1ebft xu\u1ea5t trang. H\u1ea7u h\u1ebft ch\u00fang ch\u1eb7n n\u1ed9i dung hi\u1ec3n th\u1ecb cho \u0111\u1ebfn khi ch\u00fang x\u1eed l\u00fd xong ho\u00e0n to\u00e0n- \u0111i\u1ec1u n\u00e0y v\u1eabn \u0111\u00fang th\u1eadm ch\u00ed v\u1edbi c\u00e1c m\u00e3 ki\u1ec3m tra A\/B t\u1ea3i theo ki\u1ec3u kh\u00f4ng \u0111\u1ed3ng b\u1ed9.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ban_phai_lam_gi\"><\/span>B\u1ea1n ph\u1ea3i l\u00e0m g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>S\u1eed d\u1ee5ng JavaScript c\u1ee7a <a href=\"https:\/\/kiencang.net\/he-thong-ben-ngoai-trong-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">b\u00ean th\u1ee9 ba th\u01b0\u1eddng l\u00e0 \u0111i\u1ec1u kh\u00f4ng tr\u00e1nh kh\u1ecfi<\/a>, nh\u01b0ng c\u00f3 m\u1ed9t s\u1ed1 th\u1ee9 b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m \u0111\u1ec3 t\u1ed1i thi\u1ec3u h\u00f3a c\u00e1c hi\u1ec7u \u1ee9ng b\u1ea5t l\u1ee3i:<\/p>\n\n\n<ul><li>Khi ch\u1ecdn c\u00e1c t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba, h\u00e3y thi\u00ean v\u1ec1 c\u00e1c nh\u00e0 cung c\u1ea5p g\u1eedi l\u01b0\u1ee3ng m\u00e3 \u00edt nh\u1ea5t trong khi v\u1eabn cung c\u1ea5p cho b\u1ea1n c\u00e1c ch\u1ee9c n\u0103ng m\u00e0 b\u1ea1n c\u1ea7n;<\/li><li>Kh\u00f4ng s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t ch\u1ee9c n\u0103ng t\u1eeb hai nh\u00e0 cung c\u1ea5p kh\u00e1c nhau. B\u1ea1n c\u00f3 l\u1ebd ch\u1eb3ng c\u1ea7n hai tr\u00ecnh qu\u1ea3n l\u00fd th\u1ebb ho\u1eb7c hai n\u1ec1n t\u1ea3ng ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp;<\/li><li>Ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c \u0111o\u1ea1n m\u00e3 d\u01b0 th\u1eeba c\u1ee7a b\u00ean th\u1ee9 ba;<\/li><\/ul>\n\n\n<p>\u0110\u1ec3 ki\u1ec3m tra c\u00e1c n\u1ed9i dung c\u1ee7a b\u00ean th\u1ee9 ba v\u00e0 c\u00e1ch t\u1ea3i n\u00f3 hi\u1ec7u qu\u1ea3 h\u01a1n cho v\u1ea5n \u0111\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng, b\u1ea1n h\u00e3y t\u00ecm \u0111\u1ecdc c\u00e1c b\u00e0i vi\u1ebft trong ch\u1ee7 \u0111\u1ec1 <a href=\"https:\/\/kiencang.net\/tai-nguyen-ben-thu-ba-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean c\u1ee7a b\u00ean th\u1ee9 ba<\/a>.<\/p>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft: Third-party JavaScript performance, t\u00e1c gi\u1ea3: Milica Mihajlija, web: web[.]dev)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta c\u00f9ng t\u00ecm hi\u1ec3u \u1ea3nh h\u01b0\u1edfng c\u1ee7a JavaScript b\u00ean th\u1ee9 ba l\u00ean t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t c\u1ee7a website v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m g\u00ec \u0111\u1ec3 tr\u00e1nh c\u00e1c m\u00e3 n\u00e0y l\u00e0m ch\u1eadm website c\u1ee7a b\u1ea1n. JavaScript c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u01b0\u1ee3c nh\u00fang v\u00e0o trong &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[272],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>V\u1ea5n \u0111\u1ec1 t\u1ed1c \u0111\u1ed9 c\u1ee7a JavaScript t\u1eeb b\u00ean th\u1ee9 ba &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"description\" content=\"Trong b\u00e0i n\u00e0y ch\u00fang ta c\u00f9ng t\u00ecm hi\u1ec3u \u1ea3nh h\u01b0\u1edfng c\u1ee7a JavaScript b\u00ean th\u1ee9 ba l\u00ean t\u1ed1c \u0111\u1ed9 website v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m g\u00ec \u0111\u1ec3 tr\u00e1nh c\u00e1c m\u00e3 n\u00e0y l\u00e0m ch\u1eadm trang c\u1ee7a b\u1ea1n.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/javascript-ben-thu-ba\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u1ea5n \u0111\u1ec1 t\u1ed1c \u0111\u1ed9 c\u1ee7a JavaScript t\u1eeb b\u00ean th\u1ee9 ba &#8226; 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