{"id":3105,"date":"2016-07-04T02:32:43","date_gmt":"2016-07-04T02:32:43","guid":{"rendered":"https:\/\/kiencang.net\/?p=3105"},"modified":"2016-07-04T02:32:43","modified_gmt":"2016-07-04T02:32:43","slug":"comment-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/comment-trong-javascript\/","title":{"rendered":"Comment trong JavaScript"},"content":{"rendered":"\n<p>\u0110\u1eebng coi th\u01b0\u1eddng comment, ch\u00fa th\u00edch trong JS hay trong b\u1ea5t k\u1ef3 ng\u00f4n ng\u1eef n\u00e0o n\u00f3i chung. K\u1ec3 c\u1ea3 khi b\u1ea1n l\u00e0m m\u1ed9t m\u00ecnh ho\u1eb7c l\u00e0m vi\u1ec7c nh\u00f3m th\u00ec ch\u00fa th\u00edch \u0111\u1ec1u r\u1ea5t quan tr\u1ecdng. N\u00f3 c\u00f3 2 nhi\u1ec7m v\u1ee5 ch\u00ednh:<\/p>\n\n\n\n<ul><li>Gi\u00fap m\u00e3 c\u1ee7a b\u1ea1n d\u1ec5 \u0111\u1ecdc h\u01a1n, ph\u1ea7n n\u00e0o th\u00ec l\u00e0m nhi\u1ec7m v\u1ee5 g\u00ec, c\u1ea7n l\u01b0u \u00fd c\u00e1i g\u00ec, v\u00e2n v\u00e2n v\u00e0 m\u00e2y m\u00e2y;<\/li><li>B\u1ecf qua kh\u00f4ng th\u1ef1c thi m\u1ed9t kh\u1ed1i m\u00e3 n\u00e0o \u0111\u00f3 v\u00e0 ch\u1ea1y m\u1ed9t kh\u1ed1i m\u00e3 kh\u00e1c, \u0111\u1ec3 ki\u1ec3m tra xem c\u00e1i n\u00e0o hi\u1ec7u qu\u1ea3 h\u01a1n m\u00e0 kh\u00f4ng ph\u1ea3i x\u00f3a m\u00e3 tr\u01b0\u1edbc \u0111\u00f3;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comment m\u1ed9t d\u00f2ng<\/h2>\n\n\n\n<p>Comment m\u1ed9t d\u00f2ng b\u1eaft \u0111\u1ea7u v\u1edbi hai g\u1ea1ch d\u1ecdc nghi\u00eang ph\u1ea3i <code>\/\/<\/code><\/p>\n\n\n\n<p>B\u1ea5t k\u1ef3 v\u0103n b\u1ea3n n\u00e0o n\u1eb1m gi\u1eefa <code>\/\/<\/code> v\u00e0 k\u1ebft c\u1ee7a d\u00f2ng s\u1ebd b\u1ecb b\u1ecf qua b\u1edfi JavaScript (kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c thi).<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y s\u1eed d\u1ee5ng comment m\u1ed9t d\u00f2ng tr\u01b0\u1edbc m\u1ed7i \u0111o\u1ea1n code:<\/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>\/\/ Thay \u0111\u1ed5i ti\u00eau \u0111\u1ec1:\ndocument.getElementById(\"myH\").innerHTML = \"Trang \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i\";\n\n\/\/ Thay \u0111\u1ed5i \u0111o\u1ea1n v\u0103n b\u1ea3n:\ndocument.getElementById(\"myP\").innerHTML = \"\u0110o\u1ea1n v\u0103n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.\";<\/code><\/pre>\n\n\n\n<p>C\u00f2n v\u00ed d\u1ee5 ti\u1ebfp theo s\u1eed d\u1ee5ng comment \u0111\u01a1n t\u1ea1i v\u1ecb tr\u00ed cu\u1ed1i c\u00f9ng c\u1ee7a m\u1ed7i d\u00f2ng gi\u00fap gi\u1ea3i th\u00edch d\u00f2ng code:<\/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>var x = 5; \/\/ Khai b\u00e1o bi\u1ebfn x v\u00e0 cung c\u1ea5p gi\u00e1 tr\u1ecb cho n\u00f3 l\u00e0 5\nvar y = x + 2; \/\/ Khai b\u00e1o bi\u1ebfn y v\u00e0 cung c\u1ea5p gi\u00e1 tr\u1ecb cho n\u00f3 l\u00e0 x+ 2<\/code><\/pre>\n\n\n\n<p>Ki\u1ec3u comment n\u00e0y c\u0169ng gi\u1ed1ng v\u1edbi ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh PHP.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Comment nhi\u1ec1u d\u00f2ng<\/h2>\n\n\n\n<p>Comment nhi\u1ec1u d\u00f2ng b\u1eaft \u0111\u1ea7u v\u1edbi <code>\/*<\/code> v\u00e0 k\u1ebft th\u00fac v\u1edbi <code>*\/<\/code><\/p>\n\n\n\n<p>B\u1ea5t k\u1ef3 v\u0103n b\u1ea3n n\u00e0o n\u1eb1m gi\u1eefa <code>\/*<\/code> v\u00e0 <code>*\/<\/code> s\u1ebd b\u1ecb b\u1ecf qua b\u1edfi JavaScript.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 b\u00ean d\u01b0\u1edbi s\u1eed d\u1ee5ng comment nhi\u1ec1u d\u00f2ng (kh\u1ed1i comment) \u0111\u1ec3 gi\u1ea3i th\u00edch code:<\/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>\/*\n \u0110o\u1ea1n code b\u00ean d\u01b0\u1edbi s\u1ebd thay \u0111\u1ed5i\n ti\u00eau \u0111\u1ec1 c\u00f3 id=\"myH\"\n v\u00e0 \u0111o\u1ea1n v\u0103n b\u1ea3n c\u00f3 id= \"myP\"\n trong trang web c\u1ee7a t\u00f4i:\n *\/\n document.getElementById(\"myH\").innerHTML = \"Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i\";\n\n document.getElementById(\"myP\").innerHTML = \"V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.\";<\/code><\/pre>\n\n\n\n<p>Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p n\u00ean d\u00f9ng c\u00e1c comment \u0111\u01a1n.<\/p>\n\n\n\n<p>Block comment th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng cho c\u00e1c t\u00e0i li\u1ec7u ch\u00ednh th\u1ee9c.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">S\u1eed d\u1ee5ng Comment \u0111\u1ec3 ng\u0103n vi\u1ec7c th\u1ef1c thi<\/h2>\n\n\n\n<p>S\u1eed d\u1ee5ng comment \u0111\u1ec3 ng\u0103n ng\u1eeba vi\u1ec7c th\u1ef1c thi code l\u00e0 \u0111i\u1ec1u b\u00ecnh th\u01b0\u1eddng trong vi\u1ec7c ki\u1ec3m tra m\u00e3.<\/p>\n\n\n\n<p>Th\u00eam <code>\/\/<\/code> v\u00e0o tr\u01b0\u1edbc m\u1ed9t d\u00f2ng code, s\u1ebd thay \u0111\u1ed5i \u0111o\u1ea1n code t\u1eeb l\u1ec7nh c\u1ea7n th\u1ef1c thi tr\u1edf th\u00e0nh comment.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 n\u00e0y s\u1eed d\u1ee5ng <code>\/\/<\/code> \u0111\u1ec3 ng\u0103n ng\u1eeba th\u1ef1c thi m\u1ed9t d\u00f2ng code:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/document.getElementById(\"myH\").innerHTML = \"Trang \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i\";\n\ndocument.getElementById(\"myP\").innerHTML = \"V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.\";<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5 ti\u1ebfp theo s\u1eed d\u1ee5ng comment kh\u1ed1i \u0111\u1ec3 ng\u0103n ng\u1eeba th\u1ef1c thi kh\u1ed1i l\u1ec7nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/*\ndocument.getElementById(\"myH\").innerHTML = \"Trang \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i\";\n\ndocument.getElementById(\"myP\").innerHTML = \"V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.\";\n*\/<\/code><\/pre>\n\n\n\n<p>Comment nhi\u1ec1u d\u00f2ng trong JS c\u0169ng gi\u1ed1ng comment nhi\u1ec1u d\u00f2ng trong PHP. OK, qu\u00e1 t\u1ed1t, v\u00ec c\u1ea3 2 \u0111\u1ec1u l\u00e0 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh quen thu\u1ed9c v\u1edbi ng\u01b0\u1eddi l\u00e0m web, ch\u00fang ta \u0111\u1ee1 ph\u1ea3i nh\u1edb nhi\u1ec1u.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1eebng coi th\u01b0\u1eddng comment, ch\u00fa th\u00edch trong JS hay trong b\u1ea5t k\u1ef3 ng\u00f4n ng\u1eef n\u00e0o n\u00f3i chung. K\u1ec3 c\u1ea3 khi b\u1ea1n l\u00e0m m\u1ed9t m\u00ecnh ho\u1eb7c l\u00e0m vi\u1ec7c nh\u00f3m th\u00ec ch\u00fa th\u00edch \u0111\u1ec1u r\u1ea5t quan tr\u1ecdng. N\u00f3 c\u00f3 2 nhi\u1ec7m v\u1ee5 ch\u00ednh: Gi\u00fap m\u00e3 c\u1ee7a b\u1ea1n d\u1ec5 \u0111\u1ecdc h\u01a1n, ph\u1ea7n n\u00e0o th\u00ec l\u00e0m nhi\u1ec7m v\u1ee5 g\u00ec, &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>Comment 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\/comment-trong-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"\u0110\u1eebng coi th\u01b0\u1eddng comment, ch\u00fa th\u00edch trong JS hay trong b\u1ea5t k\u1ef3 ng\u00f4n ng\u1eef n\u00e0o n\u00f3i chung. 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