{"id":10843,"date":"2015-01-23T09:38:00","date_gmt":"2015-01-23T09:38:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/23\/cau-lenh-trong-javascript\/"},"modified":"2015-01-23T09:38:00","modified_gmt":"2015-01-23T09:38:00","slug":"cau-lenh-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cau-lenh-trong-javascript\/","title":{"rendered":"C\u00e2u l\u1ec7nh trong JavaScript"},"content":{"rendered":"\n<p>Trong HTML, c\u00e2u l\u1ec7nh JavaScript \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1edfi tr\u00ecnh duy\u1ec7t web.<\/p>\n\n\n\n<p>C\u00e2u l\u1ec7nh d\u01b0\u1edbi \u0111\u00e2y n\u00f3i cho tr\u00ecnh duy\u1ec7t h\u00e3y ghi d\u00f2ng &#8220;Blog Ki\u1ebfn c\u00e0ng&#8221; v\u00e0o ph\u1ea7n t\u1eed HTML c\u00f3 <code>id=\"website\"<\/code>.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>document.getElementById(\"website\").innerHTML = \"Blog Ki\u1ebfn c\u00e0ng\";<\/code><\/pre>\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-6577d6953ecc0\" ><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-6577d6953ecc0\"  type=\"checkbox\" id=\"item-6577d6953ecc0\"><\/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\/cau-lenh-trong-javascript\/#Ma_lenh_JavaScript\" title=\"M\u00e3 l\u1ec7nh JavaScript\">M\u00e3 l\u1ec7nh JavaScript<\/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\/cau-lenh-trong-javascript\/#Dau_cham_phay\" title=\"D\u1ea5u ch\u1ea5m ph\u1ea9y ;\">D\u1ea5u ch\u1ea5m ph\u1ea9y ;<\/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\/cau-lenh-trong-javascript\/#Cac_ky_tu_trang_khoang_trang_trong_JavaScript\" title=\"C\u00e1c k\u00fd t\u1ef1 tr\u1eafng (kho\u1ea3ng tr\u1eafng) trong JavaScript\">C\u00e1c k\u00fd t\u1ef1 tr\u1eafng (kho\u1ea3ng tr\u1eafng) trong JavaScript<\/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\/cau-lenh-trong-javascript\/#Ngat_dong_va_do_dai_dong_trong_JavaScript\" title=\"Ng\u1eaft d\u00f2ng v\u00e0 \u0111\u1ed9 d\u00e0i d\u00f2ng trong JavaScript\">Ng\u1eaft d\u00f2ng v\u00e0 \u0111\u1ed9 d\u00e0i d\u00f2ng trong JavaScript<\/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\/cau-lenh-trong-javascript\/#Khoi_lenh_trong_JavaScript\" title=\"Kh\u1ed1i l\u1ec7nh trong JavaScript\">Kh\u1ed1i l\u1ec7nh trong 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\/cau-lenh-trong-javascript\/#Cac_tu_khoa_trong_JavaScript\" title=\"C\u00e1c t\u1eeb kh\u00f3a trong JavaScript\">C\u00e1c t\u1eeb kh\u00f3a trong JavaScript<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ma_lenh_JavaScript\"><\/span>M\u00e3 l\u1ec7nh JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>H\u1ea7u h\u1ebft c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh JavaScript bao g\u1ed3m nhi\u1ec1u c\u00e2u l\u1ec7nh JavaScript.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh JavaScript \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u1ee9 t\u1ef1 t\u1eebng d\u00f2ng m\u1ed9t nh\u01b0 trong code m\u00e0 n\u00f3 \u0111\u01b0\u1ee3c vi\u1ebft ra.<\/p>\n\n\n\n<p>Trong v\u00ed d\u1ee5 b\u00ean d\u01b0\u1edbi, x, y v\u00e0 z \u0111\u01b0\u1ee3c nh\u1eadn gi\u00e1 tr\u1ecb v\u00e0 cu\u1ed1i c\u00f9ng gi\u00e1 tr\u1ecb c\u1ee7a z \u0111\u01b0\u1ee3c \u0111\u01b0a ra m\u00e0n h\u00ecnh:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 7;\nvar y = 9;\nvar z = x + y;\ndocument.getElementById(\"giatri\").innerHTML = z;<\/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=\"Dau_cham_phay\"><\/span>D\u1ea5u ch\u1ea5m ph\u1ea9y ;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>D\u1ea5u ch\u1ea5m ph\u1ea9y d\u00f9ng \u0111\u1ec3 ng\u0103n c\u00e1ch c\u00e1c c\u00e2u l\u1ec7nh trong JavaScript.<\/p>\n\n\n\n<p>Th\u00eam d\u1ea5u ch\u1ea5m ph\u1ea9y v\u00e0o cu\u1ed1i m\u1ed7i c\u00e2u l\u1ec7nh c\u1ea7n th\u1ef1c thi:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a = 5;\nb = 6;\nc = a + b;<\/code><\/pre>\n\n\n\n<p>Khi \u0111\u01b0\u1ee3c ng\u0103n c\u00e1ch b\u1eb1ng d\u1ea5u ch\u1ea5m ph\u1ea9y, nhi\u1ec1u c\u00e2u l\u1ec7nh tr\u00ean m\u1ed9t d\u00f2ng l\u00e0 \u0111\u01b0\u1ee3c ph\u00e9p, v\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a = 5; b = 6; c = a + b;<\/code><\/pre>\n\n\n\n<p>Tr\u00ean web, b\u1ea1n c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y c\u00e1c v\u00ed d\u1ee5 kh\u00f4ng c\u00f3 d\u1ea5u ch\u1ea5m ph\u1ea9y. C\u00e2u l\u1ec7nh cu\u1ed1i c\u00f9ng kh\u00f4ng b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 d\u1ea5u ch\u1ea5m ph\u1ea9y, nh\u01b0ng \u0111\u01b0\u1ee3c khuy\u1ebfn c\u00e1o l\u00e0 n\u00ean d\u00f9ng (\u0111\u1ec3 t\u1ea1o th\u00e0nh th\u00f3i quen, th\u1eeba h\u01a1n thi\u1ebfu c\u00e1c b\u1ea1n \u00e0).<\/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_ky_tu_trang_khoang_trang_trong_JavaScript\"><\/span>C\u00e1c k\u00fd t\u1ef1 tr\u1eafng (kho\u1ea3ng tr\u1eafng) trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>JavaScript b\u1ecf qua c\u00e1c kho\u1ea3ng tr\u1eafng. B\u1ea1n c\u00f3 th\u1ec3 th\u00eam kho\u1ea3ng tr\u1eafng \u0111\u1ec3 gi\u00fap c\u00e1c \u0111o\u1ea1n code d\u1ec5 \u0111\u1ecdc h\u01a1n.<\/p>\n\n\n\n<p>Nh\u1eefng d\u00f2ng d\u01b0\u1edbi \u0111\u00e2y c\u00f3 \u00fd ngh\u0129a nh\u01b0 nhau:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var person = \"\u0110\u1ee9c Anh\"; \/\/ d\u1ec5 \u0111\u1ecdc h\u01a1n th\u1eadt\nvar person=\"\u0110\u1ee9c Anh\"; \/\/ nh\u01b0ng nhi\u1ec1u khi l\u01b0\u1eddi t\u00f4i c\u0169ng vi\u1ebft ki\u1ec3u n\u00e0y<\/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=\"Ngat_dong_va_do_dai_dong_trong_JavaScript\"><\/span>Ng\u1eaft d\u00f2ng v\u00e0 \u0111\u1ed9 d\u00e0i d\u00f2ng trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 m\u00e3 JS \u0111\u1ecdc d\u1ec5 d\u00e0ng h\u01a1n, c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean th\u01b0\u1eddng tr\u00e1nh vi\u1ebft nhi\u1ec1u h\u01a1n 80 k\u00fd t\u1ef1 tr\u00ean m\u1ed9t d\u00f2ng.<\/p>\n\n\n\n<p>N\u1ebfu m\u1ed9t c\u00e2u l\u1ec7nh trong JavaScript kh\u00f4ng v\u1eeba \u0111\u1ee7 trong m\u1ed9t d\u00f2ng, c\u00e1ch hay h\u01a1n l\u00e0 b\u1ebb n\u00f3, sau m\u1ed9t to\u00e1n t\u1eed (trong v\u00ed d\u1ee5 b\u00ean d\u01b0\u1edbi l\u00e0 to\u00e1n t\u1eed =):<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>document.getElementById(\"website\").innerHTML =\n\"Blog 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=\"Khoi_lenh_trong_JavaScript\"><\/span>Kh\u1ed1i l\u1ec7nh trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh trong JavaScript c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i v\u1edbi nhau th\u00e0nh kh\u1ed1i b\u00ean trong d\u1ea5u ngo\u1eb7c nh\u1ecdn { &#8230; }<\/p>\n\n\n\n<p>M\u1ee5c \u0111\u00edch c\u1ee7a kh\u1ed1i code d\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c c\u00e2u l\u1ec7nh \u0111\u01b0\u1ee3c th\u1ef1c thi c\u00f9ng l\u00fac.<\/p>\n\n\n\n<p>M\u1ed9t trong nh\u1eefng n\u01a1i b\u1ea1n c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y c\u00e1c c\u00e2u l\u1ec7nh \u0111\u01b0\u1ee3c nh\u00f3m v\u1edbi nhau th\u00e0nh kh\u1ed1i \u0111\u00f3 l\u00e0 h\u00e0m (<code>function<\/code>) c\u1ee7a JavaScript:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function myFunction() {\ndocument.getElementById(\"website\").innerHTML = \"Blog Ki\u1ebfn c\u00e0ng.\";\ndocument.getElementById(\"hoten\").innerHTML = \"Nguy\u1ec5n \u0110\u1ee9c Anh\";\n}<\/code><\/pre>\n\n\n\n<p>V\u1ec1 sau h\u1ecdc c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh ph\u00eda server, b\u1ea1n s\u1ebd th\u1ea5y c\u1ea5u tr\u00fac n\u00e0y r\u1ea5t gi\u1ed1ng h\u00e0m c\u1ee7a PHP.<\/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_tu_khoa_trong_JavaScript\"><\/span>C\u00e1c t\u1eeb kh\u00f3a trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh trong JavaScript th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u b\u1eb1ng t\u1eeb kh\u00f3a \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u00e0nh \u0111\u1ed9ng n\u00e0o \u0111\u01b0\u1ee3c th\u1ef1c thi.<\/p>\n\n\n\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e1c t\u1eeb kh\u00f3a ch\u00fang ta s\u1ebd \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u th\u00eam sau n\u00e0y: <code>break<\/code>, <code>continue<\/code>, <code>debugger<\/code>, <code>do...while<\/code>, <code>for<\/code>, <code>function<\/code>, <code>if ... else<\/code>, <code>return<\/code>, <code>switch<\/code>&#8230;<\/p>\n\n\n\n<p>C\u00e1c t\u1eeb kh\u00f3a n\u00e0y s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p s\u1eed d\u1ee5ng l\u00e0m t\u00ean bi\u1ebfn n\u1eefa (nh\u01b0 ki\u1ec3u ph\u1ea1m h\u00fay \u00ed!)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong HTML, c\u00e2u l\u1ec7nh JavaScript \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1edfi tr\u00ecnh duy\u1ec7t web. C\u00e2u l\u1ec7nh d\u01b0\u1edbi \u0111\u00e2y n\u00f3i cho tr\u00ecnh duy\u1ec7t h\u00e3y ghi d\u00f2ng &#8220;Blog Ki\u1ebfn c\u00e0ng&#8221; v\u00e0o ph\u1ea7n t\u1eed HTML c\u00f3 id=&#8221;website&#8221;. V\u00ed d\u1ee5: M\u00e3 l\u1ec7nh JavaScript H\u1ea7u h\u1ebft c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh JavaScript bao g\u1ed3m nhi\u1ec1u c\u00e2u l\u1ec7nh JavaScript. C\u00e1c c\u00e2u l\u1ec7nh JavaScript \u0111\u01b0\u1ee3c th\u1ef1c &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","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>C\u00e2u l\u1ec7nh 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\/cau-lenh-trong-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e2u l\u1ec7nh trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Trong HTML, c\u00e2u l\u1ec7nh JavaScript \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1edfi tr\u00ecnh duy\u1ec7t web. C\u00e2u l\u1ec7nh d\u01b0\u1edbi \u0111\u00e2y n\u00f3i cho tr\u00ecnh duy\u1ec7t h\u00e3y ghi d\u00f2ng &#8220;Blog Ki\u1ebfn c\u00e0ng&#8221; v\u00e0o ph\u1ea7n t\u1eed HTML c\u00f3 id=&quot;website&quot;. V\u00ed d\u1ee5: M\u00e3 l\u1ec7nh JavaScript H\u1ea7u h\u1ebft c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh JavaScript bao g\u1ed3m nhi\u1ec1u c\u00e2u l\u1ec7nh JavaScript. 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C\u00e2u l\u1ec7nh d\u01b0\u1edbi \u0111\u00e2y n\u00f3i cho tr\u00ecnh duy\u1ec7t h\u00e3y ghi d\u00f2ng &#8220;Blog Ki\u1ebfn c\u00e0ng&#8221; v\u00e0o ph\u1ea7n t\u1eed HTML c\u00f3 id=\"website\". V\u00ed d\u1ee5: M\u00e3 l\u1ec7nh JavaScript H\u1ea7u h\u1ebft c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh JavaScript bao g\u1ed3m nhi\u1ec1u c\u00e2u l\u1ec7nh JavaScript. 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