{"id":3343,"date":"2016-07-21T10:00:33","date_gmt":"2016-07-21T10:00:33","guid":{"rendered":"https:\/\/kiencang.net\/?p=3343"},"modified":"2016-07-21T10:00:33","modified_gmt":"2016-07-21T10:00:33","slug":"cac-loi-trong-javascript-throw-va-try-roi-catch","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cac-loi-trong-javascript-throw-va-try-roi-catch\/","title":{"rendered":"C\u00e1c l\u1ed7i trong JavaScript &#8211; Throw v\u00e0 Try r\u1ed3i Catch"},"content":{"rendered":"\n<p>C\u00e1c c\u00e2u l\u1ec7nh <strong>try<\/strong> cho ph\u00e9p b\u1ea1n th\u1eed nghi\u1ec7m m\u1ed9t kh\u1ed1i m\u00e3 l\u1ed7i.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh <strong>catch<\/strong> cho ph\u00e9p b\u1ea1n x\u1eed l\u00fd c\u00e1c l\u1ed7i.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh <strong>throw<\/strong> cho ph\u00e9p b\u1ea1n t\u1ea1o ra c\u00e1c l\u1ed7i t\u00f9y ch\u1ec9nh.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh <strong>finally<\/strong> cho ph\u00e9p b\u1ea1n th\u1ef1c thi m\u00e3, sau khi <strong>try<\/strong> v\u00e0 <strong>catch<\/strong>, b\u1ea5t k\u1ec3 k\u1ebft qu\u1ea3 th\u1ebf n\u00e0o.<\/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-6577d6b8869a7\" ><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-6577d6b8869a7\"  type=\"checkbox\" id=\"item-6577d6b8869a7\"><\/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-loi-trong-javascript-throw-va-try-roi-catch\/#Xuat_hien_loi\" title=\"Xu\u1ea5t hi\u1ec7n l\u1ed7i!\">Xu\u1ea5t hi\u1ec7n l\u1ed7i!<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#JavaScript_try_va_catch\" title=\"JavaScript try v\u00e0 catch\">JavaScript try v\u00e0 catch<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#JavaScript_nem_ra_ngoai_le\" title=\"JavaScript n\u00e9m ra ngo\u1ea1i l\u1ec7\">JavaScript n\u00e9m ra ngo\u1ea1i l\u1ec7<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#Cau_lenh_nem\" title=\"C\u00e2u l\u1ec7nh n\u00e9m\">C\u00e2u l\u1ec7nh n\u00e9m<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#Vi_du_ve_xac_nhan_thong_tin_nhap_vao\" title=\"V\u00ed d\u1ee5 v\u1ec1 x\u00e1c nh\u1eadn th\u00f4ng tin nh\u1eadp v\u00e0o\">V\u00ed d\u1ee5 v\u1ec1 x\u00e1c nh\u1eadn th\u00f4ng tin nh\u1eadp v\u00e0o<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#HTML_Validation\" title=\"HTML Validation\">HTML Validation<\/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-loi-trong-javascript-throw-va-try-roi-catch\/#Cau_lenh_finally\" title=\"C\u00e2u l\u1ec7nh finally\">C\u00e2u l\u1ec7nh finally<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Xuat_hien_loi\"><\/span>Xu\u1ea5t hi\u1ec7n l\u1ed7i!<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Khi b\u1ea1n th\u1ef1c thi code JavaScript, c\u00e1c l\u1ed7i kh\u00e1c nhau c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n.<\/p>\n\n\n\n<p>C\u00e1c l\u1ed7i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi c\u00e1c d\u00f2ng code l\u1ed7i c\u1ee7a l\u1eadp tr\u00ecnh vi\u00ean, l\u1ed7i c\u0169ng c\u00f3 th\u1ec3 do nh\u1eadp li\u1ec7u sai v\u00e0 nh\u1eefng th\u1ee9 kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc kh\u00e1c:<\/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>&lt;!DOCTYPE html>\n &lt;html>\n &lt;body>&lt;p id=\"demo\">&lt;\/p>&lt;script>\n try {\n adddlert(\"Welcome guest!\");\n }\n catch(err) {\n document.getElementById(\"demo\").innerHTML = err.message;\n }\n &lt;\/script>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<p>Trong v\u00ed d\u1ee5 tr\u00ean, ch\u00fang ta \u0111\u00e3 c\u00f3 m\u1ed9t l\u1ed7i \u0111\u00e1nh m\u00e1y trong c\u00e1c m\u00e3 (trong kh\u1ed1i <strong>try<\/strong>).<\/p>\n\n\n\n<p>C\u00e1c kh\u1ed1i catch b\u1eaft l\u1ed7i, v\u00e0 th\u1ef1c thi m\u00e3 \u0111\u1ec3 x\u1eed l\u00fd n\u00f3.<\/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=\"JavaScript_try_va_catch\"><\/span>JavaScript try v\u00e0 catch<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u l\u1ec7nh <strong>try<\/strong> cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh ngh\u0129a m\u1ed9t kh\u1ed1i code \u0111\u1ec3 ki\u1ec3m tra c\u00e1c l\u1ed7i trong khi th\u1ef1c thi.<\/p>\n\n\n\n<p>C\u00e2u l\u1ec7nh <strong>catch&nbsp;<\/strong>cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh ngh\u0129a m\u1ed9t kh\u1ed1i code \u0111\u1ec3 th\u1ef1c thi n\u1ebfu m\u1ed9t l\u1ed7i xu\u1ea5t hi\u1ec7n trong kh\u1ed1i try.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh try v\u00e0 catch th\u00e0nh c\u1eb7p \u0111\u00f4i trong JavaScript:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>try {\nKh\u1ed1i code \u0111\u1ec3 try\n}\ncatch(err) {\nKh\u1ed1i m\u00e3 \u0111\u1ec3 x\u1eed l\u00fd l\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=\"JavaScript_nem_ra_ngoai_le\"><\/span>JavaScript n\u00e9m ra ngo\u1ea1i l\u1ec7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Khi l\u1ed7i xu\u1ea5t hi\u1ec7n, JavaScript s\u1ebd kh\u00f4ng d\u1eebng nh\u01b0 b\u00ecnh th\u01b0\u1eddng \u0111\u01b0\u1ee3c v\u00e0 t\u1ea1o ra m\u1ed9t th\u00f4ng b\u00e1o l\u1ed7i.<\/p>\n\n\n\n<p>Thu\u1eadt ng\u1eef k\u1ef9 thu\u1eadt cho n\u00f3 l\u00e0: JavaScript s\u1ebd <strong>n\u00e9m ra m\u1ed9t ngo\u1ea1i l\u1ec7<\/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=\"Cau_lenh_nem\"><\/span>C\u00e2u l\u1ec7nh n\u00e9m<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u l\u1ec7nh&nbsp;<strong>throw<\/strong> cho ph\u00e9p b\u1ea1n t\u1ea1o ra m\u1ed9t l\u1ed7i tu\u1ef3 ch\u1ec9nh.<\/p>\n\n\n\n<p>Thu\u1eadt ng\u1eef k\u1ef9 thu\u1eadt l\u00e0 b\u1ea1n <strong>n\u00e9m ra m\u1ed9t ngo\u1ea1i l\u1ec7<\/strong>.<\/p>\n\n\n\n<p>M\u1ed9t ngo\u1ea1i l\u1ec7 c\u00f3 th\u1ec3 l\u00e0 chu\u1ed7i JavaScript, m\u1ed9t s\u1ed1, m\u1ed9t Boolean ho\u1eb7c m\u1ed9t \u0110\u1ed1i t\u01b0\u1ee3ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>throw \"Qu\u00e1 l\u1edbn\";    \/\/ n\u00e9m ra m\u1ed9t v\u0103n b\u1ea3n\nthrow 500;          \/\/ n\u00e9m ra m\u1ed9t s\u1ed1<\/code><\/pre>\n\n\n\n<p>N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng <strong>throw<\/strong>&nbsp;k\u1ebft h\u1ee3p v\u1edbi try v\u00e0 catch, b\u1ea1n c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 t\u1ea1o ra c\u00e1c th\u00f4ng b\u00e1o l\u1ed7i tu\u1ef3 ch\u1ec9nh.<\/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=\"Vi_du_ve_xac_nhan_thong_tin_nhap_vao\"><\/span>V\u00ed d\u1ee5 v\u1ec1 x\u00e1c nh\u1eadn th\u00f4ng tin nh\u1eadp v\u00e0o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u00ed d\u1ee5 n\u00e0y ki\u1ec3m tra \u0111\u1ea7u v\u00e0o. N\u1ebfu gi\u00e1 tr\u1ecb l\u00e0 sai, m\u1ed9t ngo\u1ea1i l\u1ec7 (err) \u0111\u01b0\u1ee3c n\u00e9m ra.<\/p>\n\n\n\n<p>Ngo\u1ea1i l\u1ec7 (err) \u0111\u01b0\u1ee3c t\u00f3m b\u1edfi l\u1ec7nh catch v\u00e0 m\u1ed9t th\u00f4ng b\u00e1o l\u1ed7i t\u00f9y ch\u1ec9nh \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html>\n &lt;html>\n &lt;body>&lt;p>H\u00e3y nh\u1eadp m\u1ed9t s\u1ed1 trong kho\u1ea3ng t\u1eeb 5 \u0111\u1ebfn 10:&lt;\/p>&lt;input id=\"demo\" type=\"text\">\n &lt;button type=\"button\" onclick=\"myFunction()\">Ki\u1ec3m tra gi\u00e1 tr\u1ecb nh\u1eadp v\u00e0o&lt;\/button>\n &lt;p id=\"message\">&lt;\/p>\n\n&lt;script>\n function myFunction() {\n var message, x;\n message = document.getElementById(\"message\");\n message.innerHTML = \"\";\n x = document.getElementById(\"demo\").value;\n try {\n if(x == \"\") throw \"r\u1ed7ng\";\n if(isNaN(x)) throw \"kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1\";\n x = Number(x);\n if(x &lt; 5) throw \"qu\u00e1 nh\u1ecf\";\n if(x > 10) throw \"qu\u00e1 l\u1edbn\";\n }\n catch(err) {\n message.innerHTML = \"Input is \" + err;\n }\n }\n &lt;\/script>\n\n&lt;\/body>\n&lt;\/html><\/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=\"HTML_Validation\"><\/span>HTML Validation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110o\u1ea1n code tr\u00ean ch\u1ec9 l\u00e0 v\u00ed d\u1ee5.<\/p>\n\n\n\n<p>C\u00e1c tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i s\u1ebd th\u01b0\u1eddng xuy\u00ean k\u1ebft h\u1ee3p c\u1ea3 JavaScript v\u00e0 HTML \u0111\u1ec3 chu\u1ea9n ho\u00e1, x\u00e1c nh\u1eadn th\u00f4ng tin. S\u1eed d\u1ee5ng c\u00e1c lu\u1eadt x\u00e1c th\u1ef1c c\u00f3 s\u1eb5n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a HTML:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;input id=\"demo\" type=\"number\" min=\"5\" max=\"10\" step=\"1\"<\/code><\/pre>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc th\u00eam v\u1ec1 chu\u1ea9n ho\u00e1 form trong b\u00e0i vi\u1ebft kh\u00e1c c\u1ee7a ch\u00fang t\u00f4i.<\/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=\"Cau_lenh_finally\"><\/span>C\u00e2u l\u1ec7nh finally<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u l\u1ec7nh<strong> finally<\/strong>&nbsp;cho ph\u00e9p b\u1ea1n th\u1ef1c thi code, sau khi <strong>try<\/strong> v\u00e0 <strong>catch<\/strong>, b\u1ea5t k\u1ec3 k\u1ebft qu\u1ea3 th\u1ebf n\u00e0o:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>try {\nKh\u1ed1i m\u00e3 \u0111\u1ec3 try\n}\n catch(err) {\nKh\u1ed1i m\u00e3 \u0111\u1ec3 x\u1eed l\u00fd l\u1ed7i\n}\n finally {\n Kh\u1ed1i m\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ec3 k\u1ebft qu\u1ea3 c\u1ee7a try \/ catch\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ed d\u1ee5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>function myFunction() {\n var message, x;\n message = document.getElementById(\"message\");\n message.innerHTML = \"\";\n x = document.getElementById(\"demo\").value;\n try {\n if(x == \"\") throw \"r\u1ed7ng\";\n if(isNaN(x)) throw \"kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1\";\n x = Number(x);\n if(x > 10) throw \"qu\u00e1 l\u1edbn\";\n if(x &lt; 5) throw \"qu\u00e1 nh\u1ecf\";\n }\n catch(err) {\n message.innerHTML = \"Error: \" + err + \".\";\n }\n finally {\n document.getElementById(\"demo\").value = \"\";\n }\n }<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1c c\u00e2u l\u1ec7nh try cho ph\u00e9p b\u1ea1n th\u1eed nghi\u1ec7m m\u1ed9t kh\u1ed1i m\u00e3 l\u1ed7i. C\u00e1c c\u00e2u l\u1ec7nh catch cho ph\u00e9p b\u1ea1n x\u1eed l\u00fd c\u00e1c l\u1ed7i. C\u00e1c c\u00e2u l\u1ec7nh throw cho ph\u00e9p b\u1ea1n t\u1ea1o ra c\u00e1c l\u1ed7i t\u00f9y ch\u1ec9nh. C\u00e1c c\u00e2u l\u1ec7nh finally cho ph\u00e9p b\u1ea1n th\u1ef1c thi m\u00e3, sau khi try v\u00e0 catch, b\u1ea5t k\u1ec3 k\u1ebft &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 l\u1ed7i trong JavaScript - Throw v\u00e0 Try r\u1ed3i Catch &#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-loi-trong-javascript-throw-va-try-roi-catch\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1c l\u1ed7i trong JavaScript - Throw v\u00e0 Try r\u1ed3i Catch &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"C\u00e1c c\u00e2u l\u1ec7nh try cho ph\u00e9p b\u1ea1n th\u1eed nghi\u1ec7m m\u1ed9t kh\u1ed1i m\u00e3 l\u1ed7i. C\u00e1c c\u00e2u l\u1ec7nh catch cho ph\u00e9p b\u1ea1n x\u1eed l\u00fd c\u00e1c l\u1ed7i. C\u00e1c c\u00e2u l\u1ec7nh throw cho ph\u00e9p b\u1ea1n t\u1ea1o ra c\u00e1c l\u1ed7i t\u00f9y ch\u1ec9nh. 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