{"id":5219,"date":"2026-02-20T20:55:16","date_gmt":"2026-02-20T11:55:16","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=5219"},"modified":"2026-02-23T16:53:10","modified_gmt":"2026-02-23T07:53:10","slug":"getelementsbyclassname-%e3%83%a1%e3%82%bd%e3%83%83%e3%83%88","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=5219","title":{"rendered":"getElementsByClassName \u30e1\u30bd\u30c3\u30c8"},"content":{"rendered":"\n<p>getElementsByClassName \u30e1\u30bd\u30c3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u30af\u30e9\u30b9\u540d\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b HTML\u8981\u7d20 \u3092\u53d6\u5f97\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<h1 class=\"wp-block-heading\">\u4f7f\u3044\u65b9<\/h1>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30af\u30e9\u30b9\u540d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>document.getElementsByClassName(&quot;\u30af\u30e9\u30b9\u540d&quot;);<\/code><\/pre><\/div>\n\n\n\n<p>\u30af\u30e9\u30b9\u540d\u306b\u306f &#8220;.&#8221; (\u30c9\u30c3\u30c8) \u3092\u5165\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u4e0b\u3055\u3044\u3002\u306a\u304a\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306bdocument\u3092\u6307\u5b9a\u3059\u308b\u3068HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5168\u3066\u304c\u5bfe\u8c61\u7bc4\u56f2\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u53d6\u5f97\u3067\u304d\u308b\u5024<\/h1>\n\n\n\n<p>HTML\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u53d6\u5f97\u51fa\u6765\u307e\u3059\u3002<br>HTML\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u306fHTML\u8981\u7d20\u306e\u914d\u5217\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u4f8b<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\u57fa\u672c<\/h2>\n\n\n\n<p>\u8a66\u3057\u306b\u3001&#8221;test&#8221; \u3068\u3044\u3046\u30af\u30e9\u30b9\u540d\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>HTML<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div class=&quot;test&quot;&gt;\u30c6\u30b9\u30c81&lt;\/div&gt;\n&lt;div class=&quot;test&quot;&gt;\u30c6\u30b9\u30c82&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p><strong>java script<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const elements = document.getElementsByClassName(&#39;test&#39;);\nfor (let element of elements) {\n  console.log(element);\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u7d50\u679c<\/strong><\/p>\n\n\n\n<p>for\u6587\u3092\u4f7f\u7528\u3057\u3066HTML\u8981\u7d20\u3092\u914d\u5217\u304b\u3089\u53d6\u308a\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<br>&#8220;test&#8221;\u30af\u30e9\u30b9\u304c\u6307\u5b9a\u3055\u308c\u305fHTML\u8981\u7d20\u304c\u53d6\u5f97\u51fa\u6765\u308b\u4e8b\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>&lt;div class=&quot;test&quot;&gt;\u30c6\u30b9\u30c81&lt;\/div&gt;\n&lt;div class=&quot;test&quot;&gt;\u30c6\u30b9\u30c82&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u6dfb\u3048\u5b57\u306e\u6307\u5b9a<\/h2>\n\n\n\n<p>for\u6587\u3092\u4f7f\u7528\u3057HTML\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3057\u305f\u304c\u3001\u6dfb\u3048\u5b57\u3092\u4f7f\u7528\u3057\u3066\u53d6\u5f97\u3059\u308b\u4e8b\u3082\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const elements = document.getElementsByClassName(&#39;test&#39;);\nconsole.log(elements[0]);\nconsole.log(elements[1]);<\/code><\/pre><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">\u6700\u5f8c\u306b<\/h1>\n\n\n\n<p>\u7279\u306b\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>getElementsByClassName \u30e1\u30bd\u30c3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u30af\u30e9\u30b9\u540d\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b HTML\u8981\u7d20 \u3092\u53d6\u5f97\u51fa\u6765\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":4348,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-5219","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/5219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5219"}],"version-history":[{"count":4,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/5219\/revisions"}],"predecessor-version":[{"id":5235,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/5219\/revisions\/5235"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/media\/4348"}],"wp:attachment":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}