{"id":3185,"date":"2016-07-07T09:02:42","date_gmt":"2016-07-07T09:02:42","guid":{"rendered":"https:\/\/kiencang.net\/?p=3185"},"modified":"2016-07-07T09:02:42","modified_gmt":"2016-07-07T09:02:42","slug":"ve-van-de-hieu-nang-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/ve-van-de-hieu-nang-trong-javascript\/","title":{"rendered":"V\u1ec1 v\u1ea5n \u0111\u1ec1 hi\u1ec7u n\u0103ng trong JavaScript"},"content":{"rendered":"\n<p>Trong b\u00e0i n\u00e0y b\u1ea1n s\u1ebd bi\u1ebft c\u00e1ch t\u0103ng t\u1ed1c kh\u1ea3 n\u0103ng th\u1ef1c thi code JavaScript.<\/p>\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-6577d6b2d592f\" ><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-6577d6b2d592f\"  type=\"checkbox\" id=\"item-6577d6b2d592f\"><\/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\/ve-van-de-hieu-nang-trong-javascript\/#Giam_thieu_hoat_dong_trong_vong_lap\" title=\"Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng l\u1eb7p\">Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng l\u1eb7p<\/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\/ve-van-de-hieu-nang-trong-javascript\/#Giam_thieu_hoat_dong_truy_cap_DOM\" title=\"Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng truy c\u1eadp DOM\">Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng truy c\u1eadp DOM<\/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\/ve-van-de-hieu-nang-trong-javascript\/#Giam_thieu_kich_co_DOM\" title=\"Gi\u1ea3m thi\u1ec3u k\u00edch c\u1ee1 DOM\">Gi\u1ea3m thi\u1ec3u k\u00edch c\u1ee1 DOM<\/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\/ve-van-de-hieu-nang-trong-javascript\/#Tranh_su_dung_cac_bien_khong_can_thiet\" title=\"Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c bi\u1ebfn kh\u00f4ng c\u1ea7n thi\u1ebft\">Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c bi\u1ebfn kh\u00f4ng c\u1ea7n thi\u1ebft<\/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\/ve-van-de-hieu-nang-trong-javascript\/#Tri_hoan_tai_JavaScript\" title=\"Tr\u00ec ho\u00e3n t\u1ea3i JavaScript\">Tr\u00ec ho\u00e3n t\u1ea3i JavaScript<\/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\/ve-van-de-hieu-nang-trong-javascript\/#Tranh_su_dung_with\" title=\"Tr\u00e1nh s\u1eed d\u1ee5ng with\">Tr\u00e1nh s\u1eed d\u1ee5ng with<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giam_thieu_hoat_dong_trong_vong_lap\"><\/span>Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng l\u1eb7p<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u00f2ng l\u1eb7p th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1eadp tr\u00ecnh.<\/p>\n\n\n\n<p>M\u1ed7i c\u00e2u l\u1ec7nh trong v\u00f2ng l\u1eb7p, bao g\u1ed3m <a href=\"https:\/\/kiencang.net\/vong-lap-trong-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u1ec7nh <code>for<\/code><\/a>, \u0111\u01b0\u1ee3c th\u1ef1c thi \u0111\u1ec1u \u0111\u1eb7n m\u1ed7i l\u1ea7n.<\/p>\n\n\n\n<p>L\u1ec7nh t\u00ecm ki\u1ebfm ho\u1eb7c g\u00e1n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t b\u00ean ngo\u00e0i v\u00f2ng l\u1eb7p.<\/p>\n\n\n\n<p>Code hi\u1ec7u n\u0103ng th\u1ea5p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>for (i = 0; i &lt; arr.length; i++) {<\/code><\/pre>\n\n\n\n<p>Code hi\u1ec7u n\u0103ng cao:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>l = arr.length;\nfor (i = 0; i &lt; l; i++) {<\/code><\/pre>\n\n\n\n<p>Code hi\u1ec7u n\u0103ng th\u1ea5p truy c\u1eadp thu\u1ed9c t\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a chu\u1ed7i m\u1ed7i khi v\u00f2ng l\u1eb7p \u0111\u01b0\u1ee3c th\u1ef1c thi.<\/p>\n\n\n\n<p>Code hi\u1ec7u n\u0103ng cao truy c\u1eadp thu\u1ed9c t\u00ednh chi\u1ec1u d\u00e0i b\u00ean ngo\u00e0i v\u00f2ng l\u1eb7p, \u0111i\u1ec1u \u0111\u00f3 l\u00e0m cho v\u00f2ng l\u1eb7p ch\u1ea1y nhanh h\u01a1n.<\/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=\"Giam_thieu_hoat_dong_truy_cap_DOM\"><\/span>Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng truy c\u1eadp DOM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Truy c\u1eadp v\u00e0o HTML DOM th\u01b0\u1eddng r\u1ea5t ch\u1eadm, n\u1ebfu b\u1ea1n so s\u00e1nh v\u1edbi c\u00e1c l\u1ec7nh JavaScript kh\u00e1c.<\/p>\n\n\n\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n truy c\u1eadp v\u00e0o ph\u1ea7n t\u1eed DOM nhi\u1ec1u l\u1ea7n, truy c\u1eadp n\u00f3 m\u1ed9t l\u1ea7n v\u00e0 s\u1eed d\u1ee5ng n\u00f3 nh\u01b0 l\u00e0 m\u1ed9t bi\u1ebfn \u0111\u1ecba ph\u01b0\u01a1ng s\u1ebd gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian h\u01a1n nhi\u1ec1u:<\/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>obj = document.getElementById(\"demo\");\nobj.innerHTML = \"Ki\u1ebfn c\u00e0ng\";<\/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=\"Giam_thieu_kich_co_DOM\"><\/span>Gi\u1ea3m thi\u1ec3u k\u00edch c\u1ee1 DOM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>H\u00e3y gi\u1eef s\u1ed1 l\u01b0\u1ee3ng ph\u1ea7n t\u1eed trong HTML DOM nh\u1ecf.<\/p>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y gi\u00fap n\u00e2ng cao t\u1ed1c \u0111\u1ed9 t\u1ea3i trang, v\u00e0 t\u0103ng t\u1ed1c kh\u1ea3 n\u0103ng xu\u1ea5t d\u1eef li\u1ec7u (hi\u1ec3n th\u1ecb trang), \u0111\u1eb7c bi\u1ec7t l\u00e0 tr\u00ean c\u00e1c thi\u1ebft b\u1ecb nh\u1ecf.<\/p>\n\n\n\n<p>M\u1ecdi n\u1ed7 l\u1ef1c \u0111\u1ec3 t\u00ecm ki\u1ebfm tr\u00ean DOM (nh\u01b0 <code>getElementsByTagName<\/code>) s\u1ebd \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i t\u1eeb m\u1ed9t DOM nh\u1ecf h\u01a1n.<\/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=\"Tranh_su_dung_cac_bien_khong_can_thiet\"><\/span>Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c bi\u1ebfn kh\u00f4ng c\u1ea7n thi\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1eebng t\u1ea1o c\u00e1c bi\u1ebfn m\u1edbi n\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 k\u1ebf ho\u1ea1ch s\u1eed d\u1ee5ng n\u00f3.<\/p>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ea5y \u0111o\u1ea1n code n\u00e0y c\u00f3 c\u00e1i g\u00ec \u0111\u00f3 th\u1eeba th\u00e3i kh\u00f4ng?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var fullName = firstName + \" \" + lastName;\ndocument.getElementById(\"demo\").innerHTML = fullName;<\/code><\/pre>\n\n\n\n<p>B\u1ea1n nh\u1eadn ra ch\u01b0a? \u0111\u00f3 ch\u00ednh l\u00e0 bi\u1ebfn <code>fullName<\/code>.<\/p>\n\n\n\n<p>B\u1ea1n l\u00e0m nh\u01b0 d\u01b0\u1edbi \u0111\u00e2y, cho k\u1ebft qu\u1ea3 t\u01b0\u01a1ng t\u1ef1 m\u00e0 kh\u00f4ng c\u1ea7n khai b\u00e1o th\u00eam bi\u1ebfn:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>document.getElementById(\"demo\").innerHTML = firstName + \" \" + lastName<\/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=\"Tri_hoan_tai_JavaScript\"><\/span>Tr\u00ec ho\u00e3n t\u1ea3i JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u01b0a \u0111o\u1ea1n m\u00e3 c\u1ee7a b\u1ea1n v\u00e0o ch\u00e2n c\u1ee7a ph\u1ea7n body trang (ph\u1ea7n th\u00e2n), \u0111i\u1ec1u n\u00e0y gi\u00fap tr\u00ecnh duy\u1ec7t t\u1ea3i trang tr\u01b0\u1edbc.<\/p>\n\n\n\n<p>Trong khi \u0111o\u1ea1n m\u00e3 JavaScript \u0111\u01b0\u1ee3c t\u1ea3i v\u1ec1, tr\u00ecnh duy\u1ec7t s\u1ebd kh\u00f4ng t\u1ea3i b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec kh\u00e1c. Th\u00eam v\u00e0o \u0111\u00f3 t\u1ea5t c\u1ea3 c\u00e1c ho\u1ea1t \u0111\u1ed9ng ph\u00e2n t\u00edch v\u00e0 xu\u1ea5t d\u1eef li\u1ec7u c\u00f3 th\u1ec3 b\u1ecb ch\u1eb7n l\u1ea1i.<\/p>\n\n\n\n<p>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m k\u1ef9 thu\u1eadt HTTP \u0111\u1ecbnh ngh\u0129a c\u00e1c tr\u00ecnh duy\u1ec7t kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea3i v\u1ec1 h\u01a1n hai th\u00e0nh ph\u1ea7n song song.<\/p>\n\n\n\n<p>Thu\u1ed9c t\u00ednh <strong><code>defer=\"true\"<\/code>\u00a0<\/strong>s\u1eed d\u1ee5ng trong th\u1ebb script. Thu\u1ed9c t\u00ednh &#8220;tr\u00ec ho\u00e3n&#8221; ch\u1ec9 \u0111\u1ecbnh \u0111o\u1ea1n m\u00e3 n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c thi sau khi trang \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch xong, tuy nhi\u00ean \u0111i\u1ec1u n\u00e0y ch\u1ec9 \u00e1p d\u1ee5ng v\u1edbi c\u00e1c m\u00e3 JavaScript g\u1eafn ngo\u00e0i.<\/p>\n\n\n\n<p>N\u1ebfu \u0111\u01b0\u1ee3c, b\u1ea1n c\u00f3 th\u1ec3 th\u00eam k\u1ecbch b\u1ea3n c\u1ee7a b\u1ea1n v\u00e0o trang b\u1eb1ng m\u00e3, sau khi trang \u0111\u00e3 t\u1ea3i xong:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n window.onload = downScripts; function downScripts() {\n var element = document.createElement(\"script\");\n element.src = \"myScript.js\";\n document.body.appendChild(element);\n }\n &lt;\/script&gt;<\/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=\"Tranh_su_dung_with\"><\/span>Tr\u00e1nh s\u1eed d\u1ee5ng with<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tr\u00e1nh s\u1eed d\u1ee5ng <strong>t\u1eeb kho\u00e1 with<\/strong>. N\u00f3 l\u00e0m \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c \u0111\u1ebfn t\u1ed1c \u0111\u1ed9, l\u00e0m m\u00e3 JavaScript th\u00eam h\u1ed7n t\u1ea1p.<\/p>\n\n\n\n<p>T\u1eeb kho\u00e1 <code>with<\/code> c\u0169ng kh\u00f4ng \u0111\u01b0\u1ee3c cho ph\u00e9p trong <code>mode strict<\/code> (ch\u1ebf \u0111\u1ed9 nghi\u00eam ng\u1eb7t).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u00e0i n\u00e0y b\u1ea1n s\u1ebd bi\u1ebft c\u00e1ch t\u0103ng t\u1ed1c kh\u1ea3 n\u0103ng th\u1ef1c thi code JavaScript. Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng l\u1eb7p V\u00f2ng l\u1eb7p th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1eadp tr\u00ecnh. M\u1ed7i c\u00e2u l\u1ec7nh trong v\u00f2ng l\u1eb7p, bao g\u1ed3m l\u1ec7nh for, \u0111\u01b0\u1ee3c th\u1ef1c thi \u0111\u1ec1u \u0111\u1eb7n m\u1ed7i l\u1ea7n. L\u1ec7nh t\u00ecm ki\u1ebfm ho\u1eb7c g\u00e1n c\u00f3 &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\u1ec1 v\u1ea5n \u0111\u1ec1 hi\u1ec7u n\u0103ng trong 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\/ve-van-de-hieu-nang-trong-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u1ec1 v\u1ea5n \u0111\u1ec1 hi\u1ec7u n\u0103ng trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Trong b\u00e0i n\u00e0y b\u1ea1n s\u1ebd bi\u1ebft c\u00e1ch t\u0103ng t\u1ed1c kh\u1ea3 n\u0103ng th\u1ef1c thi code JavaScript. Gi\u1ea3m thi\u1ec3u ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng l\u1eb7p V\u00f2ng l\u1eb7p th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1eadp tr\u00ecnh. M\u1ed7i c\u00e2u l\u1ec7nh trong v\u00f2ng l\u1eb7p, bao g\u1ed3m l\u1ec7nh for, \u0111\u01b0\u1ee3c th\u1ef1c thi \u0111\u1ec1u \u0111\u1eb7n m\u1ed7i l\u1ea7n. 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