try_class_11 在线代码实例

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
<style>
    .marked {
        color: red;
        font-size: 30px;
    }
</style>
    <script src="https://7npmedia.w3cschool.cn/w3.js"></script>
<body class="w3-container">
    <h2>测试 HTML 中的 W3.JS</h2>
    
    <p>点击按钮删除所有 h2 中的 w3-text-red</p>
    
    <p><button onclick="w3.removeClass('h2','marked')">删除类</button></p>
    <div id="London">
      <h2 class="marked">伦敦</h2>
      <p>伦敦是英国的首都.</p>
    </div>
    
    <div id="Paris">
      <h2 class="marked">巴黎</h2>
      <p>巴黎是法国的首都.</p> 
    </div>
    
    <div id="Tokyo">
      <h2 class="marked">东京</h2>
      <p>东京是日本的首都.</p>
    </div>
</body>
</html>
 
 
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运行结果
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