{"id":3120,"date":"2016-07-04T09:09:29","date_gmt":"2016-07-04T09:09:29","guid":{"rendered":"https:\/\/kiencang.net\/?p=3120"},"modified":"2016-07-04T09:09:29","modified_gmt":"2016-07-04T09:09:29","slug":"cac-kieu-du-lieu-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/","title":{"rendered":"C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript"},"content":{"rendered":"\n<p>Chu\u1ed7i, S\u1ed1, Boolean, M\u1ea3ng, \u0110\u1ed1i t\u01b0\u1ee3ng.<\/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-6577d6b169f3a\" ><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-6577d6b169f3a\"  type=\"checkbox\" id=\"item-6577d6b169f3a\"><\/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\/cac-kieu-du-lieu-trong-javascript\/#Cac_kieu_du_lieu_trong_JavaScript\" title=\"C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript\">C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong 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\/cac-kieu-du-lieu-trong-javascript\/#Y_tuong_cua_kieu_du_lieu\" title=\"\u00dd t\u01b0\u1edfng c\u1ee7a ki\u1ec3u d\u1eef li\u1ec7u\">\u00dd t\u01b0\u1edfng c\u1ee7a ki\u1ec3u d\u1eef li\u1ec7u<\/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\/cac-kieu-du-lieu-trong-javascript\/#JavaScript_co_cac_kieu_du_lieu_dong\" title=\"JavaScript c\u00f3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ed9ng\">JavaScript c\u00f3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ed9ng<\/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\/cac-kieu-du-lieu-trong-javascript\/#Chuoi_trong_JavaScript\" title=\"Chu\u1ed7i trong JavaScript\">Chu\u1ed7i 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\/cac-kieu-du-lieu-trong-javascript\/#Kieu_so_trong_JavaScript\" title=\"Ki\u1ec3u s\u1ed1 trong JavaScript\">Ki\u1ec3u s\u1ed1 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\/cac-kieu-du-lieu-trong-javascript\/#Kieu_Boolean_trong_JavaScript\" title=\"Ki\u1ec3u Boolean trong\u00a0JavaScript\">Ki\u1ec3u Boolean trong\u00a0JavaScript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Kieu_mang_trong_JavaScript\" title=\"Ki\u1ec3u m\u1ea3ng trong JavaScript\">Ki\u1ec3u m\u1ea3ng trong JavaScript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Kieu_doi_tuong_trong_JavaScript\" title=\"Ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript\">Ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Toan_tu_typeof\" title=\"To\u00e1n t\u1eed typeof\">To\u00e1n t\u1eed typeof<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Khong_xac_dinh\" title=\"Kh\u00f4ng x\u00e1c \u0111\u1ecbnh\">Kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Gia_tri_rong\" title=\"Gi\u00e1 tr\u1ecb r\u1ed7ng\">Gi\u00e1 tr\u1ecb r\u1ed7ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Null\" title=\"Null\">Null<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/kiencang.net\/cac-kieu-du-lieu-trong-javascript\/#Su_khac_nhau_giua_Khong_xac_dinh_va_Null\" title=\"S\u1ef1 kh\u00e1c nhau gi\u1eefa Kh\u00f4ng x\u00e1c \u0111\u1ecbnh v\u00e0 Null\">S\u1ef1 kh\u00e1c nhau gi\u1eefa Kh\u00f4ng x\u00e1c \u0111\u1ecbnh v\u00e0 Null<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_kieu_du_lieu_trong_JavaScript\"><\/span>C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c bi\u1ebfn JavaScript c\u00f3 th\u1ec3 n\u1eafm gi\u1eef nhi\u1ec1u ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0: ki\u1ec3u s\u1ed1, chu\u1ed7i, m\u1ea3ng, \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 th\u00eam m\u1ed9t s\u1ed1 c\u00e1i kh\u00e1c:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var length = 87;     \/\/ ki\u1ec3u s\u1ed1\nvar lastName = \"Nguy\u1ec5n\";     \/\/ ki\u1ec3u chu\u1ed7i\nvar cars = &#91;\"Saab\", \"Volvo\", \"BMW\"];    \/\/ ki\u1ec3u m\u1ea3ng\nvar x = {firstName:\"\u0110\u1ee9c Anh\", lastName:\"Nguy\u1ec5n\"};    \/\/ ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng<\/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=\"Y_tuong_cua_kieu_du_lieu\"><\/span>\u00dd t\u01b0\u1edfng c\u1ee7a ki\u1ec3u d\u1eef li\u1ec7u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong l\u1eadp tr\u00ecnh, ki\u1ec3u d\u1eef li\u1ec7u l\u00e0 m\u1ed9t \u00fd t\u01b0\u1edfng quan tr\u1ecdng.<\/p>\n\n\n\n<p>\u0110\u1ec3 linh ho\u1ea1t v\u00e0 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c s\u1eed d\u1ee5ng bi\u1ebfn, b\u1ea1n c\u1ea7n hi\u1ec3u m\u1ed9t s\u1ed1 th\u1ee9 v\u1ec1 ki\u1ec3u d\u1eef li\u1ec7u.<\/p>\n\n\n\n<p>N\u1ebfu kh\u00f4ng c\u00f3 ki\u1ec3u d\u1eef li\u1ec7u, m\u00e1y t\u00ednh s\u1ebd kh\u00f4ng ch\u1eafc ch\u1eafn khi gi\u1ea3i quy\u1ebft bi\u1ec3u th\u1ee9c b\u00ean d\u01b0\u1edbi:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 16 + \"Volvo\";<\/code><\/pre>\n\n\n\n<p>T\u1ea1o ra \u00fd ngh\u0129a g\u00ec khi c\u1ed9ng th\u00eam &#8220;Volvo&#8221; v\u00e0o 16 \u0111\u00e2y? N\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t l\u1ed7i hay t\u1ea1o ra m\u1ed9t k\u1ebft qu\u1ea3?<\/p>\n\n\n\n<p>JavaScript s\u1ebd s\u1eeda v\u00ed d\u1ee5 tr\u00ean th\u00e0nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = \"16\" + \"Volvo\";<\/code><\/pre>\n\n\n\n<p><strong>L\u01b0u \u00fd<\/strong>: Khi c\u1ed9ng m\u1ed9t s\u1ed1 v\u1edbi m\u1ed9t chu\u1ed7i, JavaScript s\u1ebd x\u1eed l\u00fd s\u1ed1 \u0111\u00f3 nh\u01b0 m\u1ed9t chu\u1ed7i.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 16 + \"Volvo\"; \/\/ k\u1ebft qu\u1ea3 16Volvo\n\nvar x = \"Volvo\" + 16; \/\/ k\u1ebft qu\u1ea3 Volvo16<\/code><\/pre>\n\n\n\n<p>JavaScript s\u1ebd th\u1ef1c thi m\u1ed9t bi\u1ec3u th\u1ee9c t\u1eeb tr\u00e1i qua ph\u1ea3i. Th\u1ee9 t\u1ef1 kh\u00e1c nhau trong bi\u1ec3u th\u1ee9c c\u00f3 th\u1ec3 t\u1ea1o ra nh\u1eefng k\u1ebft qu\u1ea3 kh\u00e1c nhau:<\/p>\n\n\n\n<p>JavaScript:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 16 + 4 + \"Volvo\";<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n\n<p><code>20Volvo<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>JavaScript:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = \"Volvo\" + 16 + 4;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n\n<p><code>Volvo164<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Trong v\u00ed d\u1ee5 \u0111\u1ea7u ti\u00ean, JavaScript x\u1eed l\u00fd 16 v\u00e0 4 nh\u01b0 l\u00e0 s\u1ed1, cho \u0111\u1ebfn khi n\u00f3 x\u1eed l\u00fd \u0111\u1ebfn chu\u1ed7i &#8220;Volvo&#8221; th\u00ec n\u00f3 s\u1ebd chuy\u1ec3n 20 th\u00e0nh chu\u1ed7i, v\u00e0 ra k\u1ebft qu\u1ea3 l\u00e0 gh\u00e9p chu\u1ed7i 20 v\u00e0 Volvo l\u1ea1i v\u1edbi nhau.<\/p>\n\n\n\n<p>Trong v\u00ed d\u1ee5 th\u1ee9 hai, ngay to\u00e1n h\u1ea1ng \u0111\u1ea7u ti\u00ean \u0111\u00e3 l\u00e0 chu\u1ed7i, do v\u1eady t\u1ea5t c\u1ea3 c\u00e1c to\u00e1n h\u1ea1ng ti\u1ebfp theo \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 l\u00e0 chu\u1ed7i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_co_cac_kieu_du_lieu_dong\"><\/span>JavaScript c\u00f3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ed9ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ed9ng trong JavaScript c\u00f3 ngh\u0129a l\u00e0 c\u00f9ng m\u1ed9t bi\u1ebfn c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng theo c\u00e1c c\u00e1ch kh\u00e1c nhau:<\/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;       \/\/ x kh\u00f4ng x\u00e1c \u0111\u1ecbnh\nvar x = 5;        \/\/ x l\u00e0 m\u1ed9t s\u1ed1\nvar x = \"Ki\u1ebfn c\u00e0ng\";      \/\/ x l\u00e0 m\u1ed9t chu\u1ed7i <\/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=\"Chuoi_trong_JavaScript\"><\/span>Chu\u1ed7i trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t chu\u1ed7i l\u00e0 c\u00e1c k\u00fd t\u1ef1 li\u00ean ti\u1ebfp gi\u1ed1ng nh\u01b0 &#8220;Nguy\u1ec5n \u0110\u1ee9c Anh&#8221;<\/p>\n\n\n\n<p>M\u1ed9t chu\u1ed7i \u0111\u01b0\u1ee3c vi\u1ebft trong d\u1ea5u nh\u00e1y. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng d\u1ea5u nh\u00e1y k\u00e9p ho\u1eb7c d\u1ea5u nh\u00e1y \u0111\u01a1n:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var motorName = \"Honda Wave\";   \/\/ S\u1eed d\u1ee5ng d\u1ea5u nh\u00e1y k\u00e9p\nvar carName = 'Honda Wave';   \/\/ S\u1eed d\u1ee5ng d\u1ea5u nh\u00e1y \u0111\u01a1n<\/code><\/pre>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng d\u1ea5u nh\u00e1y trong chu\u1ed7i, mi\u1ec5n l\u00e0 ch\u00fang kh\u00f4ng \u0111\u01b0\u1ee3c gi\u1ed1ng v\u1edbi d\u1ea5u nh\u00e1y bao quanh chu\u1ed7i:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var answer = \"Ch\u00fang t\u00f4i '\u1ed5n'\";  \/\/ d\u1ea5u nh\u00e1y \u0111\u01a1n b\u00ean trong d\u1ea5u nh\u00e1y k\u00e9p\n\nvar answer = \"H\u1ecd g\u1ecdi anh \u00fd l\u00e0 'thi\u00ean t\u00e0i ng\u1ed1c ngh\u1ebfch'\";  \/\/ d\u1ea5u nh\u00e1y \u0111\u01a1n b\u00ean trong d\u1ea5u nh\u00e1y k\u00e9p\n\nvar answer = '\u0110\u00fang l\u00e0 \"x\u1ee9 s\u1edf th\u1ea7n ti\u00ean\"';  \/\/ d\u1ea5u nh\u00e1y k\u00e9p b\u00ean trong d\u1ea5u nh\u00e1y \u0111\u01a1n<\/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=\"Kieu_so_trong_JavaScript\"><\/span>Ki\u1ec3u s\u1ed1 trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>JavaScript ch\u1ec9 c\u00f3 m\u1ed9t ki\u1ec3u s\u1ed1.<\/p>\n\n\n\n<p>C\u00e1c s\u1ed1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft k\u00e8m ho\u1eb7c kh\u00f4ng k\u00e8m d\u1ea5u ch\u1ea5m th\u1eadp ph\u00e2n:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x1 = 34.00;     \/\/ Vi\u1ebft s\u1ed1 v\u1edbi d\u1ea5u th\u1eadp ph\u00e2n\nvar x2 = 34;        \/\/ Vi\u1ebft s\u1ed1 kh\u00f4ng c\u00f3 d\u1ea5u th\u1eadp ph\u00e2n<\/code><\/pre>\n\n\n\n<p>C\u00e1c s\u1ed1 r\u1ea5t l\u1edbn ho\u1eb7c r\u1ea5t nh\u1ecf, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft theo ki\u1ec3u khoa h\u1ecdc (v\u1edbi k\u00fd hi\u1ec7u s\u1ed1 m\u0169):<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var y = 789e5;      \/\/ 78900000\nvar z = 789e-5;     \/\/ 0.00789<\/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=\"Kieu_Boolean_trong_JavaScript\"><\/span>Ki\u1ec3u Boolean trong\u00a0JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/booleans-trong-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">Boolean<\/a> ch\u1ec9 c\u00f3 hai gi\u00e1 tr\u1ecb: true ho\u1eb7c false (\u0111\u00fang ho\u1eb7c sai).<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = true;\nvar y = false;<\/code><\/pre>\n\n\n\n<p>Booleans th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng trong c\u00e1c b\u00e0i ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n.<\/p>\n\n\n\n<p>B\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc nhi\u1ec1u h\u01a1n v\u1ec1 m\u1ec7nh \u0111\u1ec1 ki\u1ec3m tra \u0111i\u1ec1u ki\u1ec7n trong c\u00e1c b\u00e0i kh\u00e1c v\u1ec1 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=\"Kieu_mang_trong_JavaScript\"><\/span>Ki\u1ec3u m\u1ea3ng trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ki\u1ec3u m\u1ea3ng trong JavaScript \u0111\u01b0\u1ee3c vi\u1ebft v\u1edbi d\u1ea5u ngo\u1eb7c vu\u00f4ng.<\/p>\n\n\n\n<p>C\u00e1c ph\u1ea7n t\u1eed trong m\u1ea3ng \u0111\u01b0\u1ee3c t\u00e1ch ra v\u1edbi d\u1ea5u ph\u1ea9y.<\/p>\n\n\n\n<p>\u0110o\u1ea1n code d\u01b0\u1edbi \u0111\u00e2y khai b\u00e1o (t\u1ea1o) m\u1ed9t m\u1ea3ng t\u00ean l\u00e0 <code>motor<\/code>, bao g\u1ed3m 3 ph\u1ea7n t\u1eed (t\u00ean xe m\u00e1y):<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var motor = &#91;\"Honda\", \"Yamaha\", \"Suzuki\"];<\/code><\/pre>\n\n\n\n<p>Ch\u1ec9 s\u1ed1 trong m\u1ea3ng \u0111\u00e1nh ch\u1ec9 m\u1ee5c t\u1eeb 0, c\u00f3 ngh\u0129a l\u00e0 ph\u1ea7n t\u1eed \u0111\u1ea7u ti\u00ean l\u00e0 [0], &nbsp;ph\u1ea7n t\u1eed th\u1ee9 hai l\u00e0 [1] v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c nh\u01b0 th\u1ebf.<\/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=\"Kieu_doi_tuong_trong_JavaScript\"><\/span>Ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ed1i t\u01b0\u1ee3ng trong JavaScript \u0111\u01b0\u1ee3c vi\u1ebft v\u1edbi d\u1ea5u ngo\u1eb7c nh\u1ecdn.<\/p>\n\n\n\n<p>Thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng c\u1eb7p <strong>t\u00ean:gi\u00e1 tr\u1ecb<\/strong>, \u0111\u01b0\u1ee3c ph\u00e2n chia b\u1edfi d\u1ea5u ph\u1ea9y.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var person = {firstName:\"\u0110\u1ee9c Anh\", lastName:\"Nguy\u1ec5n\", age:29, eyeColor:\"black\"};<\/code><\/pre>\n\n\n\n<p>\u0110\u1ed1i t\u01b0\u1ee3ng con ng\u01b0\u1eddi trong v\u00ed d\u1ee5 tr\u00ean c\u00f3 4 thu\u1ed9c t\u00ednh: T\u00ean (firstName), H\u1ecd (lastName), Tu\u1ed5i (age) v\u00e0 M\u00e0u m\u1eaft (eyeColor).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toan_tu_typeof\"><\/span>To\u00e1n t\u1eed typeof<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong JavaScript, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng to\u00e1n t\u1eed typeof \u0111\u1ec3 bi\u1ebft ki\u1ec3u c\u1ee7a m\u1ed9t bi\u1ebfn n\u00e0o \u0111\u00f3:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>typeof \"Nguy\u1ec5n\"   \/\/ Tr\u1ea3 v\u1ec1 ki\u1ec3u chu\u1ed7i\ntypeof 3.14  \/\/ Tr\u1ea3 v\u1ec1 ki\u1ec3u s\u1ed1\ntypeof false   \/\/ Tr\u1ea3 v\u1ec1 m\u1ed9t ki\u1ec3u boolean\ntypeof &#91;1,2,3,4]   \/\/ Tr\u1ea3 v\u1ec1 ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng\ntypeof {name:'\u0110\u1ee9c Anh', age:29} \/\/ Tr\u1ea3 v\u1ec1 ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng<\/code><\/pre>\n\n\n\n<p>Trong JavaScript, m\u1ea3ng l\u00e0 m\u1ed9t ki\u1ec3u \u0111\u1eb7c bi\u1ec7t c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. V\u00ec v\u1eady ki\u1ec3u c\u1ee7a [1,2,3,4] l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Khong_xac_dinh\"><\/span>Kh\u00f4ng x\u00e1c \u0111\u1ecbnh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong JavaScript, m\u1ed9t bi\u1ebfn kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb n\u00e0o \u0111\u01b0\u1ee3c g\u00e1n v\u00e0o th\u00ec ng\u01b0\u1eddi ta b\u1ea3o n\u00f3 c\u00f3 gi\u00e1 tr\u1ecb <strong>kh\u00f4ng x\u00e1c \u0111\u1ecbnh <\/strong>(underfined). Ki\u1ec3u d\u1eef li\u1ec7u c\u0169ng l\u00e0 <strong>kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/strong>.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var person; \/\/ Gi\u00e1 tr\u1ecb l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh, ki\u1ec3u l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/code><\/pre>\n\n\n\n<p>B\u1ea5t c\u1ee9 bi\u1ebfn n\u00e0o c\u0169ng c\u00f3 th\u1ec3 b\u1ecb l\u00e0m r\u1ed7ng b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb v\u1ec1 kh\u00f4ng x\u00e1c \u0111\u1ecbnh (<strong>undefined<\/strong>). Ki\u1ec3u c\u1ee7a n\u00f3 s\u1ebd l\u00e0 <strong>kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/strong>.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>person = undefined;  \/\/ Gi\u00e1 tr\u1ecb l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh, ki\u1ec3u l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gia_tri_rong\"><\/span>Gi\u00e1 tr\u1ecb r\u1ed7ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t gi\u00e1 tr\u1ecb r\u1ed7ng kh\u00f4ng c\u00f3 g\u00ec \u0111\u1ec3 th\u1ef1c thi khi n\u00f3 l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh (<code>undefined<\/code>).<\/p>\n\n\n\n<p>M\u1ed9t chu\u1ed7i r\u1ed7ng th\u00ec v\u1eabn c\u00f3 c\u1ea3 gi\u00e1 tr\u1ecb v\u00e0 ki\u1ec3u.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var car = \"\";  \/\/ Gi\u00e1 tr\u1ecb l\u00e0 \"\", ki\u1ec3u l\u00e0 string<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Null\"><\/span>Null<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong JavaScript null ngh\u0129a l\u00e0 &#8220;kh\u00f4ng c\u00f3 g\u00ec c\u1ea3&#8221;. N\u00f3 \u0111\u1ea1i di\u1ec7n c\u00f3 c\u00e1i g\u00ec \u0111\u00f3 kh\u00f4ng t\u1ed3n t\u1ea1i.<\/p>\n\n\n\n<p>Th\u1eadt kh\u00f4ng may, trong JavaScript, c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u c\u1ee7a null l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng (b\u1ea1n c\u00f3 th\u1ec3 coi \u0111\u00f3 l\u00e0 m\u1ed9t l\u1ed7i trong JavaScript khi \u0111\u1ec3 ki\u1ec3u c\u1ee7a null l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u00e1ng ra ki\u1ec3u c\u1ee7a n\u00f3 n\u00ean l\u00e0 null.)<\/p>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 l\u00e0m r\u1ed7ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp n\u00f3 v\u1ec1 null:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var person = null;  \/\/ Gi\u00e1 tr\u1ecb l\u00e0 null, nh\u01b0ng ki\u1ec3u v\u1eabn l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng<\/code><\/pre>\n\n\n\n<p>B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 l\u00e0m r\u1ed7ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp n\u00f3 v\u1ec1 <strong>kh\u00f4ng x\u00e1c \u0111\u1ecbnh&nbsp;<\/strong>(undefined):<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var person = undefined;     \/\/ Gi\u00e1 tr\u1ecb l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh, ki\u1ec3u l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Su_khac_nhau_giua_Khong_xac_dinh_va_Null\"><\/span>S\u1ef1 kh\u00e1c nhau gi\u1eefa Kh\u00f4ng x\u00e1c \u0111\u1ecbnh v\u00e0 Null<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>typeof undefined   \/\/ kh\u00f4ng x\u00e1c \u0111\u1ecbnh\ntypeof null   \/\/ \u0111\u1ed1i t\u01b0\u1ee3ng\nnull === undefined  \/\/ sai (false)\nnull == undefined  \/\/ \u0111\u00fang (true)<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Chu\u1ed7i, S\u1ed1, Boolean, M\u1ea3ng, \u0110\u1ed1i t\u01b0\u1ee3ng. C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript C\u00e1c bi\u1ebfn JavaScript c\u00f3 th\u1ec3 n\u1eafm gi\u1eef nhi\u1ec1u ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0: ki\u1ec3u s\u1ed1, chu\u1ed7i, m\u1ea3ng, \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 th\u00eam m\u1ed9t s\u1ed1 c\u00e1i kh\u00e1c: \u00dd t\u01b0\u1edfng c\u1ee7a ki\u1ec3u d\u1eef li\u1ec7u Trong l\u1eadp tr\u00ecnh, ki\u1ec3u d\u1eef li\u1ec7u l\u00e0 m\u1ed9t \u00fd &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\u00e1c ki\u1ec3u d\u1eef li\u1ec7u 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\/cac-kieu-du-lieu-trong-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Chu\u1ed7i, S\u1ed1, Boolean, M\u1ea3ng, \u0110\u1ed1i t\u01b0\u1ee3ng. 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