{"id":3116,"date":"2016-07-04T05:11:28","date_gmt":"2016-07-04T05:11:28","guid":{"rendered":"https:\/\/kiencang.net\/?p=3116"},"modified":"2016-07-04T05:11:28","modified_gmt":"2016-07-04T05:11:28","slug":"cac-toan-tu-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cac-toan-tu-trong-javascript\/","title":{"rendered":"C\u00e1c to\u00e1n t\u1eed trong JavaScript"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">V\u00ed d\u1ee5<\/h3>\n\n\n\n<p>G\u00e1n gi\u00e1 tr\u1ecb cho bi\u1ebfn v\u00e0 c\u1ed9ng n\u00f3 v\u1edbi nhau:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 4;         \/\/ g\u00e1n gi\u00e1 tr\u1ecb 4 cho bi\u1ebfn x\nvar y = 3;         \/\/ g\u00e1n gi\u00e1 tr\u1ecb 3 cho bi\u1ebfn y\nvar z = x + y;     \/\/ g\u00e1n gi\u00e1 tr\u1ecb 7 cho bi\u1ebfn z (t\u1ed5ng c\u1ee7a x v\u00e0 y)<\/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-6577d6b13c6dd\" ><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-6577d6b13c6dd\"  type=\"checkbox\" id=\"item-6577d6b13c6dd\"><\/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-toan-tu-trong-javascript\/#Cac_toan_tu_so_hoc_trong_JavaScript\" title=\"C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc trong JavaScript\">C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc 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-toan-tu-trong-javascript\/#Toan_tu_gan_trong_JavaScript\" title=\"To\u00e1n t\u1eed g\u00e1n trong JavaScript\">To\u00e1n t\u1eed g\u00e1n trong JavaScript<\/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-toan-tu-trong-javascript\/#Cac_toan_tu_string_trong_JavaScript\" title=\"C\u00e1c to\u00e1n t\u1eed string trong JavaScript\">C\u00e1c to\u00e1n t\u1eed string 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\/cac-toan-tu-trong-javascript\/#Them_cac_chuoi_va_so\" title=\"Th\u00eam c\u00e1c chu\u1ed7i v\u00e0 s\u1ed1\">Th\u00eam c\u00e1c chu\u1ed7i v\u00e0 s\u1ed1<\/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-toan-tu-trong-javascript\/#Cac_toan_tu_so_sanh_va_logic_trong_JavaScript\" title=\"C\u00e1c to\u00e1n t\u1eed so s\u00e1nh v\u00e0 logic trong JavaScript\">C\u00e1c to\u00e1n t\u1eed so s\u00e1nh v\u00e0 logic 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-toan-tu-trong-javascript\/#Toan_tu_kieu_trong_JavaScript\" title=\"To\u00e1n t\u1eed ki\u1ec3u trong JavaScript\">To\u00e1n t\u1eed ki\u1ec3u trong JavaScript<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_toan_tu_so_hoc_trong_JavaScript\"><\/span>C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh s\u1ed1 h\u1ecdc tr\u00ean c\u00e1c s\u1ed1 (s\u1ed1 theo ngh\u0129a \u0111en ho\u1eb7c c\u00e1c bi\u1ebfn ch\u1ee9a gi\u00e1 tr\u1ecb s\u1ed1)<\/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><\/tr><tr><td>+<\/td><td>C\u1ed9ng<\/td><\/tr><tr><td>&#8211;<\/td><td>Tr\u1eeb<\/td><\/tr><tr><td>*<\/td><td>Nh\u00e2n<\/td><\/tr><tr><td>\/<\/td><td>Chia<\/td><\/tr><tr><td>%<\/td><td>L\u1ea5y ph\u1ea7n d\u01b0<\/td><\/tr><tr><td>++<\/td><td>C\u1ed9ng th\u00eam m\u1ed9t<\/td><\/tr><tr><td>&#8212;<\/td><td>Gi\u1ea3m \u0111i m\u1ed9t<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>To\u00e1n t\u1eed c\u1ed9ng (+) d\u00f9ng \u0111\u1ec3 c\u1ed9ng c\u00e1c s\u1ed1 v\u1edbi nhau:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u1ed9ng<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 5;\nvar y = 2;\nvar z = x + y;<\/code><\/pre>\n\n\n\n<p>To\u00e1n t\u1eed nh\u00e2n (*) d\u00f9ng \u0111\u1ec3 nh\u00e2n c\u00e1c s\u1ed1 v\u1edbi nhau:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ph\u00e9p nh\u00e2n<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 5;\nvar y = 2;\nvar z = x * y;<\/code><\/pre>\n\n\n\n<p>B\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc nhi\u1ec1u h\u01a1n v\u1ec1 c\u00e1c to\u00e1n t\u1eed trong JavaScript trong nh\u1eefng ch\u01b0\u01a1ng ti\u1ebfp theo.<\/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=\"Toan_tu_gan_trong_JavaScript\"><\/span>To\u00e1n t\u1eed g\u00e1n trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c to\u00e1n t\u1eed g\u00e1n, g\u00e1n gi\u00e1 tr\u1ecb v\u00e0o c\u00e1c bi\u1ebfn trong JavaScript.<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>V\u00ed d\u1ee5<\/th><th>T\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/th><\/tr><tr><td>=<\/td><td>x = y<\/td><td>x = y<\/td><\/tr><tr><td>+=<\/td><td>x += y<\/td><td>x = x + y<\/td><\/tr><tr><td>-=<\/td><td>x -= y<\/td><td>x = x &#8211; y<\/td><\/tr><tr><td>*=<\/td><td>x *= y<\/td><td>x = x * y<\/td><\/tr><tr><td>\/=<\/td><td>x \/= y<\/td><td>x = x \/ y<\/td><\/tr><tr><td>%=<\/td><td>x %= y<\/td><td>x = x % y<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>To\u00e1n t\u1eed g\u00e1n (=) g\u00e1n m\u1ed9t gi\u00e1 tr\u1ecb cho bi\u1ebfn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">G\u00e1n<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 10;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3, x c\u00f3 gi\u00e1 tr\u1ecb 10.<\/p>\n\n\n\n<p>To\u00e1n t\u1eed g\u00e1n c\u1ed9ng (+=) th\u00eam gi\u00e1 tr\u1ecb v\u00e0o m\u1ed9t bi\u1ebfn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">G\u00e1n<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var x = 10;\nx += 5;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 l\u00e0 x c\u00f3 gi\u00e1 tr\u1ecb 15.<\/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_toan_tu_string_trong_JavaScript\"><\/span>C\u00e1c to\u00e1n t\u1eed string trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To\u00e1n t\u1eed + c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 n\u1ed1i chu\u1ed7i. Khi s\u1eed d\u1ee5ng v\u1edbi chu\u1ed7i, to\u00e1n t\u1eed + \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 to\u00e1n t\u1eed n\u1ed1i chu\u1ed7i.<\/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>txt1 = \"\u0110\u1ee9c\";\ntxt2 = \"Anh\";\ntxt3 = txt1 + \" \" + txt2;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 c\u1ee7a<strong> txt3<\/strong> s\u1ebd l\u00e0:<br>\u0110\u1ee9c Anh<\/p>\n\n\n\n<p>To\u00e1n t\u1eed += c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 n\u1ed1i c\u00e1c chu\u1ed7i v\u1edbi 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>txt1 = \"M\u1ed9t ng\u00e0y r\u1ea5t \";\ntxt1 += \"nhi\u1ec1u s\u1ef1 ki\u1ec7n\";<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 c\u1ee7a <strong>txt1<\/strong> s\u1ebd l\u00e0:<br>M\u1ed9t ng\u00e0y r\u1ea5t nhi\u1ec1u s\u1ef1 ki\u1ec7n<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Them_cac_chuoi_va_so\"><\/span>Th\u00eam c\u00e1c chu\u1ed7i v\u00e0 s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u1ed9ng hai s\u1ed1 v\u1edbi nhau, k\u1ebft qu\u1ea3 s\u1ebd l\u00e0 m\u1ed9t s\u1ed1 m\u1edbi v\u1edbi t\u1ed5ng c\u1ee7a c\u1ea3 hai, nh\u01b0ng n\u1ebfu c\u1ed9ng m\u1ed9t chu\u1ed7i v\u1edbi m\u1ed9t s\u1ed1, k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 s\u1ebd l\u00e0 m\u1ed9t chu\u1ed7i:<\/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>x = 5 + 4;\ny = \"5\" + 4;\nz = \"Xin ch\u00e0o\" + 4;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 c\u1ea3u x, y, z l\u1ea7n l\u01b0\u1ee3t s\u1ebd l\u00e0:<\/p>\n\n\n\n<p>9<br>54<br>Xin ch\u00e0o4<\/p>\n\n\n\n<p>Lu\u1eadt \u1edf \u0111\u00e2y l\u00e0: <b>N\u1ebfu b\u1ea1n c\u1ed9ng th\u00eam m\u1ed9t s\u1ed1 v\u00e0o m\u1ed9t chu\u1ed7i, k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 s\u1ebd l\u00e0 m\u1ed9t chu\u1ed7i!&nbsp;<\/b><\/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_toan_tu_so_sanh_va_logic_trong_JavaScript\"><\/span>C\u00e1c to\u00e1n t\u1eed so s\u00e1nh v\u00e0 logic trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\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><\/tr><tr><td>==<\/td><td>b\u1eb1ng v\u1edbi<\/td><\/tr><tr><td>===<\/td><td>b\u1eb1ng v\u1ec1 gi\u00e1 tr\u1ecb v\u00e0 gi\u1ed1ng v\u1ec1 ki\u1ec3u (ch\u1eb7t ch\u1ebd h\u01a1n ==)<\/td><\/tr><tr><td>!=<\/td><td>kh\u00f4ng b\u1eb1ng<\/td><\/tr><tr><td>!==<\/td><td>kh\u00f4ng b\u1eb1ng v\u1ec1 gi\u00e1 tr\u1ecb ho\u1eb7c kh\u00f4ng gi\u1ed1ng v\u1ec1 ki\u1ec3u<\/td><\/tr><tr><td>&gt;<\/td><td>l\u1edbn h\u01a1n<\/td><\/tr><tr><td>&lt;<\/td><td>nh\u1ecf h\u01a1n<\/td><\/tr><tr><td>&gt;=<\/td><td>l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng<\/td><\/tr><tr><td>&lt;=<\/td><td>nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng less than or equal to<\/td><\/tr><tr><td>?<\/td><td>to\u00e1n t\u1eed 3 ng\u00f4i<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toan_tu_kieu_trong_JavaScript\"><\/span>To\u00e1n t\u1eed ki\u1ec3u trong JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\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><\/tr><tr><td>typeof<\/td><td>Tr\u1ea3 v\u1ec1 ki\u1ec3u c\u1ee7a bi\u1ebfn<\/td><\/tr><tr><td>instanceof<\/td><td>Tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 true n\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t instance c\u1ee7a m\u1ed9t ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>V\u00ed d\u1ee5 G\u00e1n gi\u00e1 tr\u1ecb cho bi\u1ebfn v\u00e0 c\u1ed9ng n\u00f3 v\u1edbi nhau: C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc trong JavaScript C\u00e1c to\u00e1n t\u1eed s\u1ed1 h\u1ecdc s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh s\u1ed1 h\u1ecdc tr\u00ean c\u00e1c s\u1ed1 (s\u1ed1 theo ngh\u0129a \u0111en ho\u1eb7c c\u00e1c bi\u1ebfn ch\u1ee9a gi\u00e1 tr\u1ecb s\u1ed1) To\u00e1n t\u1eed M\u00f4 t\u1ea3 + C\u1ed9ng &#8211; 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