本内容遵循CC 4.0 BY-SA版权协议 补充：classList 还支持 contains('类名') 判断是否包含某类，返回布尔值；可一次传多个类名 add('a', 'b')。 补充：自定义属性用 data-前缀，通过 元素.dataset.属性名 读取（多个单词用驼峰，如 data-user-name → dataset.userName）；也可以用 元素 ...

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