{"id":19144,"date":"2024-02-15T14:14:08","date_gmt":"2024-02-15T05:14:08","guid":{"rendered":"http:\/\/www.tyosuke20xx.com\/blog\/?p=19144"},"modified":"2024-02-15T14:14:10","modified_gmt":"2024-02-15T05:14:10","slug":"javascript-classlist","status":"publish","type":"post","link":"http:\/\/www.tyosuke20xx.com\/blog\/?p=19144","title":{"rendered":"Javascript classList"},"content":{"rendered":"\n<p>index.html<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;ja&quot;&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;UTF-8&quot;&gt;\n  &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;IE=edge&quot;&gt;\n  &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;\n  &lt;title&gt;My JavaScript&lt;\/title&gt;\n  &lt;style&gt;\n    .pink-bg {\n      background: pink;\n    }\n\n    .red-border {\n      border: 2px solid red;\n    }\n\n    .green-color {\n      color: green;\n    }\n  &lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;p class=&quot;green-color&quot;&gt;Hello&lt;\/p&gt;\n  &lt;button&gt;OK&lt;\/button&gt;\n\n  &lt;script src=&quot;main.js&quot;&gt;&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre><\/div>\n\n\n\n<p>main.js<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-lang=\"JavaScript\"><code>&#39;use strict&#39;;\r\n\r\n{\r\n  document.querySelector(&#39;button&#39;).addEventListener(&#39;click&#39;, () =&gt; {\r\n    \/\/ console.log(document.querySelector(&#39;p&#39;).classList.contains(&#39;pink-bg&#39;)); \/\/ false\r\n    \/\/ if (document.querySelector(&#39;p&#39;).classList.contains(&#39;pink-bg&#39;) === false) {\r\n    \/\/   document.querySelector(&#39;p&#39;).classList.add(&#39;pink-bg&#39;);\r\n    \/\/ } else {\r\n    \/\/   document.querySelector(&#39;p&#39;).classList.remove(&#39;pink-bg&#39;);\r\n    \/\/ }\r\n    document.querySelector(&#39;p&#39;).classList.toggle(&#39;pink-bg&#39;);\r\n  });\r\n}<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"<p>index.html main.js<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-19144","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/19144","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=19144"}],"version-history":[{"count":1,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/19144\/revisions"}],"predecessor-version":[{"id":19145,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/19144\/revisions\/19145"}],"wp:attachment":[{"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19144"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.tyosuke20xx.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}