{"id":3211,"date":"2016-07-09T08:50:04","date_gmt":"2016-07-09T08:50:04","guid":{"rendered":"https:\/\/kiencang.net\/?p=3211"},"modified":"2016-07-09T08:50:04","modified_gmt":"2016-07-09T08:50:04","slug":"cau-lenh-if-else-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cau-lenh-if-else-trong-javascript\/","title":{"rendered":"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n if else trong JavaScript"},"content":{"rendered":"\n<p>C\u00e2u l\u1ec7nh d\u1ea1ng if else ph\u1ea3i n\u00f3i l\u00e0 m\u1ed9t trong c\u00e1c ki\u1ec3u l\u1ec7nh ph\u1ed5 bi\u1ebfn nh\u1ea5t trong h\u1ea7u h\u1ebft c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh, b\u1edfi n\u00f3 gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00f3 n\u00ean th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng n\u00e0o \u0111\u00f3 kh\u00f4ng d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u v\u00e0o c\u1ee5 th\u1ec3.<\/p>\n\n\n\n<p>C\u00e2u l\u1ec7nh n\u00e0y c\u0169ng r\u1ea5t d\u1ec5 hi\u1ec3u, v\u00ec n\u00f3 g\u1ea7n v\u1edbi ng\u00f4n ng\u1eef c\u1ee7a con ng\u01b0\u1eddi, ki\u1ec3u nh\u01b0: &#8220;n\u1ebfu em \u0111\u1ee3i \u0111\u01b0\u1ee3c anh 3 n\u0103m th\u00ec ch\u00fang ta s\u1ebd g\u1eb7p l\u1ea1i nhau&#8221;. D\u0129 nhi\u00ean n\u00f3 c\u0169ng c\u00f3 ph\u1ea7n kh\u00e1c. V\u00ec v\u1edbi c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n c\u1ee7a con ng\u01b0\u1eddi n\u00f3 c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c thi ngay c\u1ea3 khi \u0111i\u1ec1u ki\u1ec7n th\u1ecfa m\u00e3n!<\/p>\n\n\n\n<p>OK, v\u0103n v\u1edf th\u1ebf th\u00f4i, gi\u1edd ch\u00fang ta s\u1ebd v\u00e0o b\u00e0i.<\/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-6577d6b4222b0\" ><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-6577d6b4222b0\"  type=\"checkbox\" id=\"item-6577d6b4222b0\"><\/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-if-else-trong-javascript\/#Cau_lenh_dieu_kien\" title=\"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n\">C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n<\/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-if-else-trong-javascript\/#Cau_lenh_if\" title=\"C\u00e2u l\u1ec7nh if\">C\u00e2u l\u1ec7nh if<\/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-if-else-trong-javascript\/#Cau_lenh_else\" title=\"C\u00e2u l\u1ec7nh else\">C\u00e2u l\u1ec7nh else<\/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-if-else-trong-javascript\/#Cau_lenh_else_if\" title=\"C\u00e2u l\u1ec7nh else if\">C\u00e2u l\u1ec7nh else if<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_lenh_dieu_kien\"><\/span>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>R\u1ea5t th\u01b0\u1eddng xuy\u00ean khi b\u1ea1n vi\u1ebft code, b\u1ea1n mu\u1ed1n th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng kh\u00e1c nhau tu\u1ef3 v\u00e0o t\u1eebng tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3.<\/p>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n trong \u0111o\u1ea1n code c\u1ee7a b\u1ea1n \u0111\u1ec3 l\u00e0m \u0111i\u1ec1u \u0111\u00f3.<\/p>\n\n\n\n<p>Trong JavaScript, ch\u00fang ta c\u00f3 c\u00e1c c\u00e2u \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n\n\n\n<ul><li>S\u1eed d\u1ee5ng <strong><code>if<\/code><\/strong> \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh kh\u1ed1i code c\u1ea7n th\u1ef1c thi, n\u1ebfu \u0111i\u1ec1u ki\u1ec7n ch\u1ec9 \u0111\u1ecbnh l\u00e0 \u0111\u00fang;<\/li><li>S\u1eed d\u1ee5ng <strong><code>else<\/code>\u00a0<\/strong>\u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh kh\u1ed1i code c\u1ea7n th\u1ef1c thi, n\u1ebfu v\u1eabn \u0111i\u1ec1u ki\u1ec7n \u1edf tr\u00ean l\u00e0 sai;<\/li><li>S\u1eed d\u1ee5ng <strong><code>else if<\/code><\/strong>\u00a0\u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh \u0111i\u1ec1u ki\u1ec7n m\u1edbi c\u1ea7n ki\u1ec3m tra, n\u1ebfu \u0111i\u1ec1u ki\u1ec7n if ban \u0111\u1ea7u kh\u00f4ng \u0111\u00fang (false);<\/li><li>S\u1eed d\u1ee5ng <strong><code>switch<\/code><\/strong> \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh c\u00e1c kh\u1ed1i code li\u00ean k\u1ebft \u0111\u01b0\u1ee3c th\u1ef1c thi;<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_lenh_if\"><\/span>C\u00e2u l\u1ec7nh if<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>S\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh <strong><code>if<\/code><\/strong> \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh kh\u1ed1i code JavaScript c\u1ea7n th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n l\u00e0 \u0111\u00fang.<\/p>\n\n\n\n<p>C\u00fa ph\u00e1p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (\u0111i\u1ec1u ki\u1ec7n) {\n    \/\/ kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n l\u00e0 \u0111\u00fang\n}<\/code><\/pre>\n\n\n\n<p>L\u01b0u \u00fd l\u00e0 <strong><code>if<\/code><\/strong> \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng ch\u1eef c\u00e1i th\u01b0\u1eddng. D\u1ea1ng vi\u1ebft hoa (If ho\u1eb7c IF) s\u1ebd t\u1ea1o ra c\u00e1c l\u1ed7i trong JavaScript.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>T\u1ea1o l\u1eddi ch\u00e0o &#8220;Ng\u00e0y t\u1ed1t l\u00e0nh&#8221; n\u1ebfu gi\u1edd hi\u1ec7n t\u1ea1i nh\u1ecf h\u01a1n 18:00<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (hour &lt; 18) {\n   greeting = \"Good day\";\n}<\/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=\"Cau_lenh_else\"><\/span>C\u00e2u l\u1ec7nh else<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>S\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh <strong>else<\/strong> \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n kh\u00f4ng \u0111\u00fang<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (\u0111i\u1ec1u ki\u1ec7n) {\n     \/\/ Kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n l\u00e0 \u0111\u00fang\n} \n\nelse {\n     \/\/ Kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n l\u00e0 sai\n}<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>N\u1ebfu gi\u1edd nh\u1ecf h\u01a1n 18, t\u1ea1o l\u1eddi ch\u00e0o &#8220;Ng\u00e0y m\u1edbi vui v\u1ebb&#8221;, c\u00f2n kh\u00f4ng th\u00ec g\u1eedi l\u1eddi ch\u00e0o &#8220;Bu\u1ed5i t\u1ed1i vui v\u1ebb&#8221;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (hour &lt; 18) {\n greeting = \"Ng\u00e0y m\u1edbi vui v\u1ebb\";\n} \n\nelse {\n greeting = \"Bu\u1ed5i t\u1ed1i vui v\u1ebb\";\n}<\/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=\"Cau_lenh_else_if\"><\/span>C\u00e2u l\u1ec7nh else if<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>S\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh <strong><code>else if<\/code><\/strong>\u00a0 \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh \u0111i\u1ec1u ki\u1ec7n m\u1edbi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u ti\u00ean kh\u00f4ng \u0111\u00fang.<\/p>\n\n\n\n<p>C\u00fa ph\u00e1p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (\u0111i\u1ec1u ki\u1ec7n 1) {\n     \/\/ Kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n 1 \u0111\u00fang\n} \n\nelse if (\u0111i\u1ec1u ki\u1ec7n 2) {\n    \/\/ Kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n 1 sai v\u00e0 \u0111i\u1ec1u ki\u1ec7n 2 \u0111\u00fang \n} \n\nelse {\n     \/\/ Kh\u1ed1i code \u0111\u01b0\u1ee3c th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n 1 sai v\u00e0 \u0111i\u1ec1u ki\u1ec7n 2 c\u0169ng sai n\u1ed1t\n}<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>N\u1ebfu th\u1eddi gian nh\u1ecf h\u01a1n 10:00, t\u1ea1o l\u1eddi ch\u00e0o &#8220;Ch\u00e0o bu\u1ed5i s\u00e1ng&#8221;, n\u1ebfu kh\u00f4ng ph\u1ea3i trong kho\u1ea3ng \u0111\u00f3 nh\u01b0ng l\u1ea1i nh\u1ecf h\u01a1n 20:00, t\u1ea1o l\u1eddi ch\u00e0o &#8220;Ng\u00e0y vui v\u1ebb nh\u00e9&#8221;, cu\u1ed1i c\u00f9ng, kh\u00f4ng r\u01a1i v\u00e0o c\u00e1c tr\u01b0\u1eddng h\u1ee3p tr\u00ean t\u1ea1o l\u1eddi ch\u00e0o &#8220;Ch\u00e0o bu\u1ed5i t\u1ed1i&#8221;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (time &lt; 10) {\n   greeting = \"Ch\u00e0o bu\u1ed5i s\u00e1ng\";\n} \n\nelse if (time &lt; 20) {\n   greeting = \"Ng\u00e0y vui v\u1ebb nh\u00e9\";\n} \n\nelse {\n   greeting = \"Ch\u00e0o bu\u1ed5i t\u1ed1i\";\n}<\/code><\/pre>\n\n\n\n<p>N\u1ebfu b\u1ea1n n\u00e0o \u0111\u00e3 h\u1ecdc qua PHP, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y c\u00fa ph\u00e1p, c\u00e1c d\u1ea5u s\u1eed d\u1ee5ng nh\u01b0 ngo\u1eb7c tr\u00f2n, ch\u1ea5m ph\u1ea9y, ngo\u1eb7c nh\u1ecdn c\u1ee7a JS r\u1ea5t gi\u1ed1ng v\u1edbi PHP.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e2u l\u1ec7nh d\u1ea1ng if else ph\u1ea3i n\u00f3i l\u00e0 m\u1ed9t trong c\u00e1c ki\u1ec3u l\u1ec7nh ph\u1ed5 bi\u1ebfn nh\u1ea5t trong h\u1ea7u h\u1ebft c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh, b\u1edfi n\u00f3 gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00f3 n\u00ean th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng n\u00e0o \u0111\u00f3 kh\u00f4ng d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u v\u00e0o c\u1ee5 th\u1ec3. C\u00e2u l\u1ec7nh n\u00e0y c\u0169ng r\u1ea5t d\u1ec5 &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>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n if else 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-if-else-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 \u0111i\u1ec1u ki\u1ec7n if else trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u l\u1ec7nh d\u1ea1ng if else ph\u1ea3i n\u00f3i l\u00e0 m\u1ed9t trong c\u00e1c ki\u1ec3u l\u1ec7nh ph\u1ed5 bi\u1ebfn nh\u1ea5t trong h\u1ea7u h\u1ebft c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh, b\u1edfi n\u00f3 gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00f3 n\u00ean th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng n\u00e0o \u0111\u00f3 kh\u00f4ng d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u v\u00e0o c\u1ee5 th\u1ec3. 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