{"id":3092,"date":"2016-07-02T08:43:04","date_gmt":"2016-07-02T08:43:04","guid":{"rendered":"https:\/\/kiencang.net\/?p=3092"},"modified":"2016-07-02T08:43:04","modified_gmt":"2016-07-02T08:43:04","slug":"vi-tri-dat-cua-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/","title":{"rendered":"V\u1ecb tr\u00ed \u0111\u1eb7t c\u1ee7a JavaScript"},"content":{"rendered":"\n<p>JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong khu v\u1ef1c c\u1ee7a th\u1ebb <code>&lt;body><\/code> v\u00e0 th\u1ebb <code>&lt;head><\/code> trong t\u00e0i li\u1ec7u HTML.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\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-6577d6b07b396\" ><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-6577d6b07b396\"  type=\"checkbox\" id=\"item-6577d6b07b396\"><\/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\/vi-tri-dat-cua-javascript\/#The\" title=\"Th\u1ebb &lt;script&gt;\">Th\u1ebb &lt;script&gt;<\/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\/vi-tri-dat-cua-javascript\/#Cac_ham_JavaScript_va_su_kien\" title=\"C\u00e1c h\u00e0m JavaScript v\u00e0 s\u1ef1 ki\u1ec7n\">C\u00e1c h\u00e0m JavaScript v\u00e0 s\u1ef1 ki\u1ec7n<\/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\/vi-tri-dat-cua-javascript\/#JavaScript_trong_phan_hoac\" title=\"JavaScript trong ph\u1ea7n &lt;head&gt; ho\u1eb7c &lt;body&gt;\">JavaScript trong ph\u1ea7n &lt;head&gt; ho\u1eb7c &lt;body&gt;<\/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\/vi-tri-dat-cua-javascript\/#JavaScript_trong_khu_vuc\" title=\"JavaScript trong khu v\u1ef1c &lt;head&gt;\">JavaScript trong khu v\u1ef1c &lt;head&gt;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/#JavaScript_trong_khu_vuc-2\" title=\"JavaScript trong khu v\u1ef1c &lt;body&gt;\">JavaScript trong khu v\u1ef1c &lt;body&gt;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/#JavaScript_ben_ngoai\" title=\"JavaScript b\u00ean ngo\u00e0i\">JavaScript b\u00ean ngo\u00e0i<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/#Uu_diem_cua_file_JavaScript_ben_ngoai\" title=\"\u01afu \u0111i\u1ec3m c\u1ee7a file JavaScript b\u00ean ngo\u00e0i\">\u01afu \u0111i\u1ec3m c\u1ee7a file JavaScript b\u00ean ngo\u00e0i<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The\"><\/span>Th\u1ebb &lt;script&gt;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong HTML, c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript ph\u1ea3i \u0111\u01b0\u1ee3c ch\u00e8n v\u00e0o trong th\u1ebb m\u1edf <code>&lt;script><\/code> v\u00e0 th\u1ebb \u0111\u00f3ng <code>&lt;\/script><\/code>.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\ndocument.getElementById(\"demo\").innerHTML = \"\u0110o\u1ea1n m\u00e3 JavaScript \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i\";\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p>C\u00e1c v\u00ed d\u1ee5 c\u0169 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh <code>type<\/code>:\u00a0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script type=\"text\/javascript\"&gt;<\/code><\/pre>\n\n\n\n<p>Thu\u1ed9c t\u00ednh <code>type<\/code> kh\u00f4ng ph\u1ea3i l\u00e0 y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c. JavaScript l\u00e0 ng\u00f4n ng\u1eef <code>scripting<\/code> m\u1eb7c \u0111\u1ecbnh trong HTML.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_ham_JavaScript_va_su_kien\"><\/span>C\u00e1c h\u00e0m JavaScript v\u00e0 s\u1ef1 ki\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t h\u00e0m (<code>function<\/code>) JavaScript l\u00e0 m\u1ed9t kh\u1ed1i m\u00e3 JavaScript, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c thi khi \u0111\u01b0\u1ee3c \u201cg\u1ecdi\u201d \/ call \u0111\u1ebfn.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5, m\u1ed9t h\u00e0m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c thi khi m\u1ed9t <strong>s\u1ef1 ki\u1ec7n (event)<\/strong> c\u00f3 m\u1eb7t, th\u00ed d\u1ee5 nh\u01b0 khi ng\u01b0\u1eddi d\u00f9ng click v\u00e0o n\u00fat b\u1ea5m (button).<\/p>\n\n\n\n<p>B\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc nhi\u1ec1u h\u01a1n v\u1ec1 c\u00e1c h\u00e0m v\u00e0 s\u1ef1 ki\u1ec7n trong c\u00e1c b\u00e0i kh\u00e1c tr\u00ean Ki\u1ebfn c\u00e0ng.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_trong_phan_hoac\"><\/span>JavaScript trong ph\u1ea7n &lt;head&gt; ho\u1eb7c &lt;body&gt;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 ch\u00e8n c\u00e1c \u0111o\u1ea1n m\u00e3 v\u00f4 s\u1ed1 l\u1ea7n trong t\u00e0i li\u1ec7u HTML.<\/p>\n\n\n\n<p>C\u00e1c \u0111o\u1ea1n m\u00e3 c\u00f3 th\u1ec3 ch\u00e8n trong ph\u1ea7n <code>&lt;body><\/code> ho\u1eb7c trong ph\u1ea7n <code>&lt;head><\/code> c\u1ee7a trang HTML, hay c\u1ea3 hai c\u0169ng \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p><strong>M\u1eb9o<\/strong>: Gi\u1eef t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n code \u1edf m\u1ed9t khu v\u1ef1c th\u00f4i l\u00e0 th\u00f3i quen t\u1ed1t cho b\u1ea1n.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_trong_khu_vuc\"><\/span>JavaScript trong khu v\u1ef1c &lt;head&gt;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, m\u1ed9t h\u00e0m JavaScript trong khu v\u1ef1c <code>&lt;head><\/code> c\u1ee7a trang HTML.<\/p>\n\n\n\n<p>H\u00e0m \u0111\u01b0\u1ee3c g\u1ecdi khi n\u00fat nh\u1ea5n \u0111\u01b0\u1ee3c click:<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html>\n&lt;html>\n&lt;head>\n&lt;script>\nfunction myFunction() {\ndocument.getElementById(\"demo\").innerHTML = \"Thay \u0111\u1ed5i v\u0103n b\u1ea3n.\";\n}\n&lt;\/script>\n&lt;\/head>\n\n&lt;body>\n\n&lt;h1>Trang web c\u1ee7a t\u00f4i&lt;\/h1>\n\n&lt;p id=\"demo\">M\u1ed9t \u0111o\u1ea1n v\u0103n b\u1ea3n b\u1ea5t k\u1ef3&lt;\/p>\n\n&lt;button type=\"button\" onclick=\"myFunction()\">B\u1ea1n nh\u1ea5n th\u1eed xem&lt;\/button>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_trong_khu_vuc-2\"><\/span>JavaScript trong khu v\u1ef1c &lt;body&gt;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, m\u1ed9t h\u00e0m JavaScript n\u1eb1m trong khu v\u1ef1c <code>&lt;body><\/code> c\u1ee7a trang HTML.<\/p>\n\n\n\n<p>H\u00e0m s\u1ebd \u0111\u01b0\u1ee3c g\u1ecdi khi khi n\u00fat nh\u1ea5n \u0111\u01b0\u1ee3c click:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ed d\u1ee5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n&lt;body&gt;\n&lt;h1&gt;Trang web c\u1ee7a t\u00f4i&lt;\/h1&gt;\n\n&lt;p id=\"demo\"&gt;M\u1ed9t \u0111o\u1ea1n v\u0103n b\u1ea3n b\u1ea5t k\u1ef3&lt;\/p&gt;\n\n&lt;button type=\"button\" onclick=\"myFunction()\"&gt;B\u1ea1n nh\u1ea5n th\u1eed xem&lt;\/button&gt;\n\n&lt;script&gt;\nfunction myFunction() {\ndocument.getElementById(\"demo\").innerHTML = \"V\u0103n b\u1ea3n \u0111\u01b0\u1ee3c thay \u0111\u1ed5i.\";\n}\n&lt;\/script&gt;\n\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p>S\u1ebd l\u00e0 m\u1ed9t \u00fd t\u01b0\u1edfng t\u1ed1t \u0111\u1ec3 \u0111\u1eb7t c\u00e1c \u0111o\u1ea1n m\u00e3 \u1edf cu\u1ed1i ph\u1ea7n t\u1eed <code>&lt;body><\/code> (t\u1ee9c l\u00e0 ng\u00e0y tr\u00ean th\u1ebb \u0111\u00f3ng <code>&lt;\/body><\/code>). \u0110i\u1ec1u \u0111\u00f3 <a href=\"https:\/\/kiencang.net\/category\/speed-js\/\" target=\"_blank\" rel=\"noreferrer noopener\">gi\u00fap c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 t\u1ea3i trang<\/a>, b\u1edfi v\u00ec \u0111\u1ec3 c\u00e1c \u0111o\u1ea1n m\u00e3 l\u00ean tr\u01b0\u1edbc c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh hi\u1ec3n th\u1ecb.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_ben_ngoai\"><\/span>JavaScript b\u00ean ngo\u00e0i<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c \u0111o\u1ea1n m\u00e3 script c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf file b\u00ean ngo\u00e0i (gi\u1ed1ng ki\u1ec3u file CSS):<\/p>\n\n\n\n<p>B\u1ea1n vi\u1ebft c\u00e1c \u0111o\u1ea1n m\u00e3 v\u00e0 l\u01b0u n\u00f3 l\u1ea1i th\u00e0nh file:\u00a0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>myScript.jsfunction myFunction() {\ndocument.getElementById(\"demo\").innerHTML = \"Thay \u0111\u1ed5i n\u1ed9i dung v\u0103n b\u1ea3n\";\n}<\/code><\/pre>\n\n\n\n<p>C\u00e1c \u0111o\u1ea1n m\u00e3 b\u00ean ngo\u00e0i r\u1ea5t h\u1eefu \u00edch khi b\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng m\u1ed9t \u0111o\u1ea1n code nhi\u1ec1u l\u1ea7n \u1edf nhi\u1ec1u trang kh\u00e1c nhau.<\/p>\n\n\n\n<p>File JavaScript c\u00f3 \u0111u\u00f4i m\u1edf r\u1ed9ng l\u00e0&nbsp;<strong>.js<\/strong><\/p>\n\n\n\n<p>\u0110\u1ec3 s\u1eed d\u1ee5ng c\u00e1c \u0111o\u1ea1n m\u00e3 ngo\u00e0i, b\u1ea1n \u0111\u01b0a t\u00ean c\u1ee7a file v\u00e0o trong thu\u1ed9c t\u00ednh <code>src<\/code> c\u1ee7a th\u1ebb <code>&lt;script><\/code>:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n&lt;body&gt;\n&lt;script src=\"myScript.js\"&gt;&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 th\u00eam c\u00e1c \u0111o\u1ea1n m\u00e3 b\u00ean ngo\u00e0i trong khu v\u1ef1c <code>&lt;head><\/code> ho\u1eb7c <code>&lt;body><\/code> n\u1ebfu b\u1ea1n th\u00edch.<\/p>\n\n\n\n<p>C\u00e1c k\u1ecbch b\u1ea3n s\u1ebd th\u1ef1c thi nh\u01b0 th\u1ec3 n\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1eb7t ch\u00ednh x\u00e1c n\u01a1i c\u00e1c th\u1ebb <code>&lt;script><\/code> n\u1eb1m.<\/p>\n\n\n\n<p>L\u01b0u \u00fd l\u00e0 c\u00e1c \u0111o\u1ea1n m\u00e3 l\u01b0u ngo\u00e0i kh\u00f4ng th\u1ec3 ch\u1ee9a th\u1ebb <code>&lt;script><\/code> (n\u00f3 kh\u00f4ng c\u1ea7n th\u1ebb n\u00e0y trong file .js)<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Uu_diem_cua_file_JavaScript_ben_ngoai\"><\/span>\u01afu \u0111i\u1ec3m c\u1ee7a file JavaScript b\u00ean ngo\u00e0i<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c file JavaScript l\u01b0u ngo\u00e0i c\u00f3 m\u1ed9t s\u1ed1 l\u1ee3i \u00edch sau:<\/p>\n\n\n\n<ul><li>N\u00f3 ph\u00e2n \u0111\u1ecbnh r\u00f5 r\u00e0ng HTML v\u00e0 code;<\/li><li>N\u00f3 l\u00e0m cho HTML v\u00e0 JavaScript d\u1ec5 \u0111\u1ecdc v\u00e0 b\u1ea3o tr\u00ec;<\/li><li>C\u00e1c file JavaScript \u0111\u01b0\u1ee3c l\u01b0u \u0111\u1ec7m (<a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">cache tr\u00ecnh duy\u1ec7t<\/a>) c\u00f3 th\u1ec3 \u0111\u1ea9y nhanh t\u1ed1c \u0111\u1ed9 t\u1ea3i trang;<\/li><\/ul>\n\n\n\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n th\u00eam nhi\u1ec1u file JS v\u00e0o trang \u0111\u01a1n gi\u1ea3n l\u00e0 th\u00eam c\u00e1c th\u1ebb script m\u1edbi:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"myScript1.js\">&lt;\/script>\n&lt;script src=\"myScript2.js\">&lt;\/script><\/code><\/pre>\n\n\n\n<p>C\u00e1c file JS ngo\u00e0i c\u00f3 th\u1ec3 th\u00eam v\u00e0o trang th\u00f4ng qua 2 c\u00e1ch:<\/p>\n\n\n\n<ul><li>URL \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a n\u00f3, v\u00ed d\u1ee5:<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script\n src=\"https:\/\/code.jquery.com\/jquery-3.6.0.min.js\"\n>&lt;\/script><\/code><\/pre>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y r\u1ea5t hay \u00e1p d\u1ee5ng v\u1edbi JS c\u1ee7a b\u00ean th\u1ee9 ba (t\u1ee9c l\u00e0 kh\u00f4ng n\u1eb1m tr\u00ean hosting c\u1ee7a b\u1ea1n).<\/p>\n\n\n\n<ul><li>URL d\u1ea1ng r\u00fat g\u1ecdn, v\u00ed d\u1ee5:<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"js\/myfile.js\"\n>&lt;\/script><\/code><\/pre>\n\n\n\n<p>C\u00e1i n\u00e0y r\u1ea5t th\u01b0\u1eddng xuy\u00ean \u00e1p d\u1ee5ng n\u1ebfu file JS n\u1eb1m tr\u00ean hosting c\u1ee7a b\u1ea1n, v\u00e0 b\u1ea1n ch\u1ec9 ph\u1ea3i ch\u1ec9 \u0111\u01b0\u1eddng d\u1eabn t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a n\u00f3 cho \u0111\u1ee1 m\u1ea5t th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong khu v\u1ef1c c\u1ee7a th\u1ebb &lt;body> v\u00e0 th\u1ebb &lt;head> trong t\u00e0i li\u1ec7u HTML. Th\u1ebb &lt;script&gt; Trong HTML, c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript ph\u1ea3i \u0111\u01b0\u1ee3c ch\u00e8n v\u00e0o trong th\u1ebb m\u1edf &lt;script> v\u00e0 th\u1ebb \u0111\u00f3ng &lt;\/script>. V\u00ed d\u1ee5: C\u00e1c v\u00ed d\u1ee5 c\u0169 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh type:\u00a0 Thu\u1ed9c t\u00ednh type kh\u00f4ng &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>V\u1ecb tr\u00ed \u0111\u1eb7t c\u1ee7a JavaScript &#8226; Ki\u1ebfn c\u00e0ng<\/title>\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\/vi-tri-dat-cua-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u1ecb tr\u00ed \u0111\u1eb7t c\u1ee7a JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong khu v\u1ef1c c\u1ee7a th\u1ebb &lt;body&gt; v\u00e0 th\u1ebb &lt;head&gt; trong t\u00e0i li\u1ec7u HTML. Th\u1ebb &lt;script&gt; Trong HTML, c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript ph\u1ea3i \u0111\u01b0\u1ee3c ch\u00e8n v\u00e0o trong th\u1ebb m\u1edf &lt;script&gt; v\u00e0 th\u1ebb \u0111\u00f3ng &lt;\/script&gt;. V\u00ed d\u1ee5: C\u00e1c v\u00ed d\u1ee5 c\u0169 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh type:\u00a0 Thu\u1ed9c t\u00ednh type kh\u00f4ng &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2016-07-02T08:43:04+00:00\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"V\u1ecb tr\u00ed \u0111\u1eb7t c\u1ee7a JavaScript &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/vi-tri-dat-cua-javascript\/","og_locale":"vi_VN","og_type":"article","og_title":"V\u1ecb tr\u00ed \u0111\u1eb7t c\u1ee7a JavaScript &#8226; Ki\u1ebfn c\u00e0ng","og_description":"JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong khu v\u1ef1c c\u1ee7a th\u1ebb &lt;body> v\u00e0 th\u1ebb &lt;head> trong t\u00e0i li\u1ec7u HTML. Th\u1ebb &lt;script&gt; Trong HTML, c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript ph\u1ea3i \u0111\u01b0\u1ee3c ch\u00e8n v\u00e0o trong th\u1ebb m\u1edf &lt;script> v\u00e0 th\u1ebb \u0111\u00f3ng &lt;\/script>. 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