{"id":3087,"date":"2016-07-02T07:58:35","date_gmt":"2016-07-02T07:58:35","guid":{"rendered":"https:\/\/kiencang.net\/?p=3087"},"modified":"2016-07-02T07:58:35","modified_gmt":"2016-07-02T07:58:35","slug":"javascript-co-the-lam-duoc-nhung-gi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/javascript-co-the-lam-duoc-nhung-gi\/","title":{"rendered":"JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec?"},"content":{"rendered":"\n<p>B\u00e0i vi\u1ebft n\u00e0y bao g\u1ed3m m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 vi\u1ec7c JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec. B\u1ea1n ch\u1eafc ch\u1eafn s\u1ebd ng\u1ea1c nhi\u00ean \u0111\u1ea5y, c\u00f3 khi c\u00f2n h\u01a1n t\u00f4i.<\/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-6577d6b04bd86\" ><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-6577d6b04bd86\"  type=\"checkbox\" id=\"item-6577d6b04bd86\"><\/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\/javascript-co-the-lam-duoc-nhung-gi\/#JavaScript_Co_the_thay_doi_noi_dung_cua_trang_HTML\" title=\"JavaScript C\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung c\u1ee7a trang HTML\">JavaScript C\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung c\u1ee7a trang HTML<\/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\/javascript-co-the-lam-duoc-nhung-gi\/#JavaScript_co_the_thay_doi_cac_thuoc_tinh_cua_HTML\" title=\"JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a HTML\">JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a HTML<\/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\/javascript-co-the-lam-duoc-nhung-gi\/#JavaScript_co_the_an_phan_tu_HTML\" title=\"JavaScript c\u00f3 th\u1ec3 \u1ea9n ph\u1ea7n t\u1eed HTML\">JavaScript c\u00f3 th\u1ec3 \u1ea9n ph\u1ea7n t\u1eed HTML<\/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\/javascript-co-the-lam-duoc-nhung-gi\/#JavaScript_cso_the_hien_cac_phan_tu_HTML\" title=\"JavaScript cso th\u1ec3 hi\u1ec7n c\u00e1c ph\u1ea7n t\u1eed HTML\">JavaScript cso th\u1ec3 hi\u1ec7n c\u00e1c ph\u1ea7n t\u1eed HTML<\/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\/javascript-co-the-lam-duoc-nhung-gi\/#Ngoai_ra_JavaScript_con_lam_gi_duoc_nua_khong\" title=\"Ngo\u00e0i ra JavaScript c\u00f2n l\u00e0m g\u00ec \u0111\u01b0\u1ee3c n\u1eefa kh\u00f4ng?\">Ngo\u00e0i ra JavaScript c\u00f2n l\u00e0m g\u00ec \u0111\u01b0\u1ee3c n\u1eefa kh\u00f4ng?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_Co_the_thay_doi_noi_dung_cua_trang_HTML\"><\/span>JavaScript C\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung c\u1ee7a trang HTML<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>S\u1eed d\u1ee5ng m\u1ed9t trong nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a JavaScript HTML l\u00e0 <strong>getElementById().<\/strong><\/p>\n\n\n\n<p>V\u00ed d\u1ee5 n\u00e0y s\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ec3 &#8220;t\u00ecm ki\u1ebfm&#8221; ph\u1ea7n t\u1eed HTML c\u00f3 id = &#8220;demo&#8221; v\u00e0 th\u1ef1c hi\u1ec7n thay \u0111\u1ed5i n\u1ed9i dung ph\u1ea7n t\u1eed (s\u1eed d\u1ee5ng&nbsp;<strong>innerHTML<\/strong>) th\u00e0nh &#8220;Ch\u00e0o em &#8211; ch\u00e0o JavaScript&#8221;<\/p>\n\n\n\n<p>Code m\u1eabu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;span id=\"demo\">JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung trang HTML.&lt;\/span>\n\n&lt;button type=\"button\" onclick=\"document.getElementById('demo').innerHTML = 'Ch\u00e0o em - ch\u00e0o JavaScript'\">B\u1ea5m T\u1edb N\u00e0y!&lt;\/button><\/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_co_the_thay_doi_cac_thuoc_tinh_cua_HTML\"><\/span>JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a HTML<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong v\u00ed d\u1ee5 n\u00e0y, JavaScript s\u1ebd thay \u0111\u1ed5i \u1ea3nh b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i thu\u1ed9c t\u00ednh src (ngu\u1ed3n) c\u1ee7a th\u1ebb &lt;img&gt;.<\/p>\n\n\n\n<p>Code m\u1eabu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;button onclick=\"document.getElementById('myImage').src='bat_den.gif'\">B\u1eadt \u0111\u00e8n&lt;\/button>\n\n&lt;img id=\"myImage\" src=\"tat_den.gif\" style=\"width:100px\">\n\n&lt;button onclick=\"document.getElementById('myImage').src='tat_den.gif'\">T\u1eaft \u0111\u00e8n&lt;\/button><\/code><\/pre>\n\n\n\n<p>Khi n\u00fat &#8220;B\u1eadt \u0111\u00e8n&#8221; \u0111\u01b0\u1ee3c nh\u1ea5n, ngu\u1ed3n \u1ea3nh (thu\u1ed9c t\u00ednh src quy\u1ebft \u0111\u1ecbnh) s\u1ebd \u0111\u01b0\u1ee3c thay \u0111\u1ed5i. B\u1ea1n v\u1eabn d\u00f9ng <strong>getElementById\u00a0<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i Style (CSS)<\/h3>\n\n\n\n<p>Thay \u0111\u1ed5i style c\u1ee7a ph\u1ea7n t\u1eed HTML, m\u1ed9t bi\u1ebfn th\u1ec3 c\u1ee7a ki\u1ec3u thay \u0111\u1ed5i thu\u1ed9c t\u00ednh HTML.<\/p>\n\n\n\n<p>Code m\u1eabu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;p id=\"demo\">JavaScript c\u00f3 th\u1ec3 thay \u0111\u1ed5i style c\u1ee7a ph\u1ea7n t\u1eed HTML.&lt;\/p>\n\n&lt;button type=\"button\" onclick=\"document.getElementById('demo').style.fontSize='40px'\">Nh\u1ea5n th\u1eed xem!&lt;\/button><\/code><\/pre>\n\n\n\n<p>Khi b\u1ea1n nh\u1ea7n n\u00fat, font-size c\u1ee7a v\u0103n b\u1ea3n s\u1ebd t\u0103ng l\u00ean 40px.<\/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_co_the_an_phan_tu_HTML\"><\/span>JavaScript c\u00f3 th\u1ec3 \u1ea9n ph\u1ea7n t\u1eed HTML<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u1ea8n m\u1ed9t ph\u1ea7n t\u1eed HTML ho\u00e0n to\u00e0n th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i thu\u1ed9c t\u00ednh display.<\/p>\n\n\n\n<p>Code m\u1eabu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;p id=\"demo\">JavaScript c\u00f3 th\u1ec3 \u1ea9n c\u00e1c ph\u1ea7n t\u1eed HTML.&lt;\/p>\n\n&lt;button type=\"button\" onclick=\"document.getElementById('demo').style.display='none'\">Nh\u1ea5n th\u1eed xem!&lt;\/button><\/code><\/pre>\n\n\n\n<p>Khi b\u1ea1n nh\u1ea5n n\u00fat, v\u0103n b\u1ea3n s\u1ebd b\u1ecb \u1ea9n \u0111i.<\/p>\n\n\n\n<ul><li><em>getElementById(&#8216;demo&#8217;)<\/em>: ngh\u0129a l\u00e0 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn ph\u1ea7n t\u1eed HTML c\u00f3 id l\u00e0 demo<\/li><li><em>style<\/em>: ngh\u0129a l\u00e0 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn CSS<\/li><li><em>display<\/em>: l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh c\u1ee7a th\u1ebb &lt;p&gt;<\/li><li><em>none<\/em>: l\u00e0 gi\u00e1 tr\u1ecb c\u1ee7a thu\u1ed9c t\u00ednh <em>display<\/em><\/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=\"JavaScript_cso_the_hien_cac_phan_tu_HTML\"><\/span>JavaScript cso th\u1ec3 hi\u1ec7n c\u00e1c ph\u1ea7n t\u1eed HTML<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N\u1ebfu \u1ea9n \u0111\u01b0\u1ee3c, th\u00ec b\u1ea1n c\u0169ng hi\u1ec7n \u0111\u01b0\u1ee3c ph\u1ea7n t\u1eed HTML, c\u00e1ch l\u00e0m ch\u1ec9 l\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n\n\n\n<p>Code m\u1eabu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;p id=\"demo\" style=\"display:none\">Ch\u00e0o JavaScript nh\u00e9!&lt;\/p>\n\n&lt;button type=\"button\" onclick=\"document.getElementById('demo').style.display='block'\">Nh\u1ea5n t\u00f4i xem!&lt;\/button><\/code><\/pre>\n\n\n\n<p>Khi b\u1ea1n nh\u1ea5n n\u00fat, th\u00ec v\u0103n b\u1ea3n &#8220;Ch\u00e0o JavaScript nh\u00e9!&#8221; s\u1ebd hi\u1ec7n ra.<\/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=\"Ngoai_ra_JavaScript_con_lam_gi_duoc_nua_khong\"><\/span>Ngo\u00e0i ra JavaScript c\u00f2n l\u00e0m g\u00ec \u0111\u01b0\u1ee3c n\u1eefa kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Th\u1eadt kh\u00f3 \u0111\u1ec3 tr\u1ea3 l\u1eddi tr\u1ecdn v\u1eb9n JavaScript l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec?<\/p>\n\n\n\n<p>C\u00e1c v\u00ed d\u1ee5 tr\u00ean ch\u1ec9 l\u00e0 m\u1ed9t v\u00e0i pha bi\u1ec3u di\u1ec5n c\u1ee7a JavaScript th\u00f4i, n\u1ed9i c\u00f4ng c\u1ee7a n\u00f3 c\u00f2n th\u00e2m h\u1eadu h\u01a1n nhi\u1ec1u!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u00e0i vi\u1ebft n\u00e0y bao g\u1ed3m m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 vi\u1ec7c JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec. B\u1ea1n ch\u1eafc ch\u1eafn s\u1ebd ng\u1ea1c nhi\u00ean \u0111\u1ea5y, c\u00f3 khi c\u00f2n h\u01a1n t\u00f4i. JavaScript C\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung c\u1ee7a trang HTML S\u1eed d\u1ee5ng m\u1ed9t trong nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a JavaScript HTML l\u00e0 getElementById(). V\u00ed d\u1ee5 n\u00e0y &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>JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec? &#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\/javascript-co-the-lam-duoc-nhung-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec? &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i vi\u1ebft n\u00e0y bao g\u1ed3m m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 vi\u1ec7c JavaScript c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec. B\u1ea1n ch\u1eafc ch\u1eafn s\u1ebd ng\u1ea1c nhi\u00ean \u0111\u1ea5y, c\u00f3 khi c\u00f2n h\u01a1n t\u00f4i. JavaScript C\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u1ed9i dung c\u1ee7a trang HTML S\u1eed d\u1ee5ng m\u1ed9t trong nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a JavaScript HTML l\u00e0 getElementById(). 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