{"id":3248,"date":"2016-07-12T14:24:35","date_gmt":"2016-07-12T14:24:35","guid":{"rendered":"https:\/\/kiencang.net\/?p=3248"},"modified":"2016-07-12T14:24:35","modified_gmt":"2016-07-12T14:24:35","slug":"booleans-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/booleans-trong-javascript\/","title":{"rendered":"Boolean trong JavaScript"},"content":{"rendered":"\n<p>JavaScript Boolean m\u00f4 t\u1ea3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb: <strong>true<\/strong> (\u0111\u00fang) ho\u1eb7c <strong>false<\/strong> (sai).<\/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-6577d6b5600d4\" ><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-6577d6b5600d4\"  type=\"checkbox\" id=\"item-6577d6b5600d4\"><\/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\/booleans-trong-javascript\/#Gia_tri_Boolean\" title=\"Gi\u00e1 tr\u1ecb Boolean\">Gi\u00e1 tr\u1ecb Boolean<\/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\/booleans-trong-javascript\/#Ham_Boolean\" title=\"H\u00e0m Boolean()\">H\u00e0m Boolean()<\/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\/booleans-trong-javascript\/#So_sanh_va_Dieu_kien\" title=\"So s\u00e1nh v\u00e0 \u0110i\u1ec1u ki\u1ec7n\">So s\u00e1nh v\u00e0 \u0110i\u1ec1u ki\u1ec7n<\/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\/booleans-trong-javascript\/#Tat_ca_cai_gi_la_gia_tri_%E2%80%9CThuc%E2%80%9D_deu_la_True\" title=\"T\u1ea5t c\u1ea3 c\u00e1i g\u00ec l\u00e0 gi\u00e1 tr\u1ecb &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 True\">T\u1ea5t c\u1ea3 c\u00e1i g\u00ec l\u00e0 gi\u00e1 tr\u1ecb &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 True<\/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\/booleans-trong-javascript\/#Tat_ca_nhung_gi_khong_phai_la_%E2%80%9CThuc%E2%80%9D_deu_la_False\" title=\"T\u1ea5t c\u1ea3 nh\u1eefng g\u00ec kh\u00f4ng ph\u1ea3i l\u00e0 &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 False\">T\u1ea5t c\u1ea3 nh\u1eefng g\u00ec kh\u00f4ng ph\u1ea3i l\u00e0 &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 False<\/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\/booleans-trong-javascript\/#Cac_phuong_thuc_va_thuoc_tinh_cua_Boolean\" title=\"C\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh c\u1ee7a Boolean\">C\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh c\u1ee7a Boolean<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gia_tri_Boolean\"><\/span>Gi\u00e1 tr\u1ecb Boolean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Khi l\u1eadp tr\u00ecnh r\u1ea5t th\u01b0\u1eddng xuy\u00ean b\u1ea1n s\u1ebd c\u1ea7n m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb, nh\u01b0:<\/p>\n\n\n\n<ul><li><strong>YES \/ NO<\/strong> (C\u00d3 \/ KH\u00d4NG)<\/li><li><strong>ON \/ OFF<\/strong> (B\u1eacT \/ T\u1eaeT)<\/li><li><strong>TRUE \/ FALSE<\/strong> (\u0110\u00daNG \/ SAI)<\/li><\/ul>\n\n\n\n<p>V\u00ec m\u1ee5c \u0111\u00edch \u0111\u00f3, JavaScript c\u00f3 ki\u1ec3u d\u1eef li\u1ec3u <strong>Boolean<\/strong>. N\u00f3 ch\u1ec9 c\u00f3 gi\u00e1 tr\u1ecb <strong>true<\/strong> ho\u1eb7c <strong>false<\/strong>.<\/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=\"Ham_Boolean\"><\/span>H\u00e0m Boolean()<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng h\u00e0m <code>Boolean()<\/code> \u0111\u1ec3 bi\u1ebft xem m\u1ed9t bi\u1ec3u th\u1ee9c (ho\u1eb7c m\u1ed9t bi\u1ebfn) c\u00f3 \u0111\u00fang hay kh\u00f4ng. V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Boolean(10 &gt; 9) \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 true<\/code><\/pre>\n\n\n\n<p>Ho\u1eb7c th\u1eadm ch\u00ed d\u1ec5 h\u01a1n. V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(10 &gt; 9) \/\/ c\u0169ng tr\u1ea3 v\u1ec1 v\u1ec1 k\u1ebft qu\u1ea3 true\n10 &gt; 9  \/\/ c\u0169ng tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 true<\/code><\/pre>\n\n\n\n<p>L\u01b0u \u00fd: c\u00e1c c\u00e2u l\u1ec7nh c\u1ee7a JS c\u00f3 ph\u00e2n bi\u1ec7t ch\u1eef HOA, ch\u1eef th\u01b0\u1eddng, do v\u1eady c\u00e2u l\u1ec7nh <code>Boolean()<\/code> s\u1ebd ho\u1ea1t \u0111\u1ed9ng, trong khi <code>boolean()<\/code> th\u00ec kh\u00f4ng.<\/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=\"So_sanh_va_Dieu_kien\"><\/span>So s\u00e1nh v\u00e0 \u0110i\u1ec1u ki\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u01b0\u01a1ng so s\u00e1nh (comparisons) trong JS cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 to\u00e1n t\u1eed so s\u00e1nh.<\/p>\n\n\n\n<p>Ch\u01b0\u01a1ng \u0111i\u1ec1u ki\u1ec7n (conditions) trong JS cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 c\u00e1i nh\u00ecn v\u1ec1 c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n.<\/p>\n\n\n\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>M\u00f4 t\u1ea3<\/th><th>V\u00ed d\u1ee5<\/th><\/tr><tr><td><code>==<\/code><\/td><td>b\u1eb1ng v\u1edbi<\/td><td><code>if (ngay == \"thu_hai\")<\/code><\/td><\/tr><tr><td><code>><\/code><\/td><td>l\u1edbn h\u01a1n<\/td><td><code>if (tien_luong > 9000)<\/code><\/td><\/tr><tr><td><code>&lt;<\/code><\/td><td>nh\u1ecf h\u01a1n<\/td><td><code>if (tuoi &lt; 18)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a bi\u1ec3u th\u1ee9c l\u00e0 n\u1ec1n t\u1ea3ng cho c\u00e1c ph\u00e9p so s\u00e1nh v\u00e0 \u0111i\u1ec1u ki\u1ec7n trong JavaScript.<\/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=\"Tat_ca_cai_gi_la_gia_tri_%E2%80%9CThuc%E2%80%9D_deu_la_True\"><\/span>T\u1ea5t c\u1ea3 c\u00e1i g\u00ec l\u00e0 gi\u00e1 tr\u1ecb &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 True<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c v\u00ed d\u1ee5:<\/p>\n\n\n\n<ul><li>100<\/li><li>3.14<\/li><li>-15<\/li><li>&#8220;Xin ch\u00e0o&#8221;<\/li><li>&#8220;false&#8221;<\/li><li>7 + 1 + 3.14<\/li><li>5 &lt; 6<\/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=\"Tat_ca_nhung_gi_khong_phai_la_%E2%80%9CThuc%E2%80%9D_deu_la_False\"><\/span>T\u1ea5t c\u1ea3 nh\u1eefng g\u00ec kh\u00f4ng ph\u1ea3i l\u00e0 &#8220;Th\u1ef1c&#8221; \u0111\u1ec1u l\u00e0 False<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a <strong>0<\/strong> (zero) l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 0;\nBoolean(x);  \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a -0 l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = -0;\nBoolean(x);  \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a &#8220;&#8221; (chu\u1ed7i r\u1ed7ng) l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = \"\";\nBoolean(x);   \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a <strong>undefined<\/strong>&nbsp;(kh\u00f4ng x\u00e1c \u0111\u1ecbnh) l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x;\nBoolean(x);  \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a<strong> null<\/strong> l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = null;\nBoolean(x);   \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a<strong> false<\/strong> l\u00e0 (b\u1ea1n \u0111o\u00e1n \u0111\u00fang r\u1ed3i) <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = false;\nBoolean(x);   \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Gi\u00e1 tr\u1ecb Boolean c\u1ee7a<strong> NaN<\/strong>&nbsp;l\u00e0 <strong>false<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 10 \/ \"H\";\nBoolean(x);  \/\/ tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 false<\/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=\"Cac_phuong_thuc_va_thuoc_tinh_cua_Boolean\"><\/span>C\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh c\u1ee7a Boolean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Gi\u00e1 tr\u1ecb nguy\u00ean thu\u1ef7 nh\u01b0 <code>true<\/code> v\u00e0 <code>false<\/code>, kh\u00f4ng c\u00f3 thu\u1ed9c t\u00ednh ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c (b\u1edfi v\u00ec ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng).<\/p>\n\n\n\n<p>Nh\u01b0ng v\u1edbi JavaScript, c\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh c\u0169ng \u0111\u01b0\u1ee3c cung c\u1ea5p cho c\u00e1c gi\u00e1 tr\u1ecb nguy\u00ean thu\u1ef7, b\u1edfi v\u00ec JavaScript x\u1eed l\u00fd gi\u00e1 tr\u1ecb nguy\u00ean thu\u1ef7 nh\u01b0 \u0111\u1ed1i t\u01b0\u1ee3ng khi th\u1ef1c thi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript Boolean m\u00f4 t\u1ea3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb: true (\u0111\u00fang) ho\u1eb7c false (sai). Gi\u00e1 tr\u1ecb Boolean Khi l\u1eadp tr\u00ecnh r\u1ea5t th\u01b0\u1eddng xuy\u00ean b\u1ea1n s\u1ebd c\u1ea7n m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb, nh\u01b0: YES \/ NO (C\u00d3 \/ KH\u00d4NG) ON \/ OFF (B\u1eacT \/ T\u1eaeT) TRUE \/ FALSE &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>Boolean 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\/booleans-trong-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Boolean trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"JavaScript Boolean m\u00f4 t\u1ea3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb: true (\u0111\u00fang) ho\u1eb7c false (sai). Gi\u00e1 tr\u1ecb Boolean Khi l\u1eadp tr\u00ecnh r\u1ea5t th\u01b0\u1eddng xuy\u00ean b\u1ea1n s\u1ebd c\u1ea7n m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb, nh\u01b0: YES \/ NO (C\u00d3 \/ KH\u00d4NG) ON \/ OFF (B\u1eacT \/ T\u1eaeT) TRUE \/ FALSE &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/booleans-trong-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=\"2016-07-12T14:24:35+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=\"3 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Boolean trong 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\/booleans-trong-javascript\/","og_locale":"vi_VN","og_type":"article","og_title":"Boolean trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng","og_description":"JavaScript Boolean m\u00f4 t\u1ea3 m\u1ed9t trong hai gi\u00e1 tr\u1ecb: true (\u0111\u00fang) ho\u1eb7c false (sai). 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