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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
    <script src="https://7npmedia.w3cschool.cn/w3.js"></script>
<body>
    <h2>测试 CSS 中的 W3.JS</h2>
    
    <p>点击按钮将 class='w3-red w3-xlarge' 类添加到 id='London' 中.</p>
    
    <p><button onclick="w3.addClass('#London','w3-red w3-xlarge')">添加类</button></p>
    <div id="London" class="w3-panel w3-border city">
      <h2>伦敦</h2>
      <p>伦敦是英国的首都.</p>
    </div>
    
    <div id="Paris" class="w3-panel w3-border city">
      <h2>巴黎</h2>
      <p>巴黎是法国的首都.</p> 
    </div>
    
    <div id="Tokyo" class="w3-panel w3-border city">
      <h2>东京</h2>
      <p>东京是日本的首都.</p>
    </div>
</body>
</html>
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