{"id":4679,"date":"2026-01-02T09:23:02","date_gmt":"2026-01-02T00:23:02","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=4679"},"modified":"2026-01-02T09:38:54","modified_gmt":"2026-01-02T00:38:54","slug":"javascript-%e3%83%a1%e3%83%a2","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=4679","title":{"rendered":"document.getElementById()"},"content":{"rendered":"\n<p>getElementById \u306b\u3064\u3044\u3066<\/p>\n\n\n\n<!--more-->\n\n\n\n<h1 class=\"wp-block-heading\">\u4f8b<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">html<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div id=&quot;test&quot; class=&quot;a_class b_class&quot;&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">javascript<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ Element\nconst testId = document.getElementById(&#39;test&#39;);\n\n\/\/ \u7d50\u679c\nconsole.log(testId);<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u7d50\u679c<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div id=&quot;test&quot; class=&quot;a_class b_class&quot;&gt;&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u8aac\u660e<\/h2>\n\n\n\n<p>HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u304b\u3089\u6307\u5b9a\u3057\u305fID\u306e\u8981\u7d20\u3092Element\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u53d6\u5f97\u3057\u307e\u3059\u3002<br>ID\u306fHTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u3067\u30e6\u30cb\u30fc\u30af\u3067\u3042\u308b\u70ba document \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3066\u4f7f\u7528\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u30af\u30e9\u30b9\u306e\u53d6\u5f97<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\u6307\u5b9a\u3057\u305fID\u306e\u5b50\u8981\u7d20\u306e\u307f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">html<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div id=&quot;test&quot;&gt;\n  &lt;div class=&quot;children&quot;&gt;&lt;\/div&gt;\n&lt;\/div&gt;\n&lt;div class=&quot;children&quot;&gt;&lt;\/div&gt;\n<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">javascript<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ Element\nconst testId = document.getElementById(&#39;test&#39;);\n\n\/\/ HTML Collection\nconst children = testId.getElementsByClassName(&#39;children&#39;);\n\n\/\/ \u7d50\u679c\u8868\u793a\nconsole.log(children);<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u7d50\u679c<\/h3>\n\n\n\n<p>1\u3064\u306e\u307f\u53d6\u308c\u3066\u305d\u3046\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>HTMLCollection\u00a0[div.children]\n0: div.childrenlength: \n1[[Prototype]]: HTMLCollection<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"<p>getElementById \u306b\u3064\u3044\u3066<\/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-4679","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\/4679","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=4679"}],"version-history":[{"count":5,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4679\/revisions"}],"predecessor-version":[{"id":4685,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4679\/revisions\/4685"}],"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=4679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}