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const box = document.querySelector('.box');\r\n\r\nbox.classList.add('active');<\/code><\/pre>\n.box {\r\n\u3000width: 100px;\r\n\u3000height: 100px;\r\n\u3000background: #999;\r\n}\r\n\r\n.box.active {\r\n\u3000background: #2563eb;\r\n}<\/code><\/pre>\n
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const box = document.querySelector('.box');\r\nconsole.log(box);<\/code><\/pre>\n
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\n\u539f\u56e02\uff1aJavaScript\u306e\u8aad\u307f\u8fbc\u307f\u9806\u304c\u9593\u9055\u3063\u3066\u3044\u308b<\/span><\/h2>\n
<script src="main.js"><\/script>\r\n<div class="box"><\/div><\/code><\/pre>\n<div class="box"><\/div>\r\n<script src="main.js"><\/script><\/code><\/pre>\nwindow.addEventListener('DOMContentLoaded', () => {\r\nconst box = document.querySelector('.box');\r\nbox.classList.add('active');\r\n});<\/code><\/pre>\n
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\n\t\tNG\u4f8b<\/span>
\n\t<\/h4>\n.box .active {\r\n background: red;\r\n}<\/code><\/pre>\n
\n\u6b63\u3057\u304f\u306f<\/p>\n.box.active {\r\n background: red;\r\n}<\/code><\/pre>\n
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<div class="box active"><\/div><\/code><\/pre>\nbox.classList.add('active');<\/code><\/pre>\n
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.box {\r\n animation: fade 1s forwards;\r\n}<\/code><\/pre>\n.box.active {\r\n animation: fade 1s forwards;\r\n}<\/code><\/pre>\n
\n\u539f\u56e06\uff1adisplay:none \u72b6\u614b\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u3066\u3044\u308b<\/span><\/h2>\n
.box {\r\n display: none;\r\n}\r\n\r\n.box.active {\r\n display: block;\r\n animation: fade 1s;\r\n}<\/code><\/pre>\n.box {\r\n opacity: 0;\r\n pointer-events: none;\r\n}\r\n\r\n.box.active {\r\n opacity: 1;\r\n pointer-events: auto;\r\n}<\/code><\/pre>\n
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btn.addEventListener('click', () => {\r\nbox.classList.add('active');\r\n});<\/code><\/pre>\n\n\t\t\u78ba\u8a8d\u65b9\u6cd5<\/span>
\n\t<\/h4>\nbtn.addEventListener('click', () => {\r\nconsole.log('\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f');\r\n});<\/code><\/pre>\n
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btn.addEventListener('click', () => {\r\nbox.classList.toggle('active');\r\n});<\/code><\/pre>\n
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