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實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
    <script src="https://7npmedia.w3cschool.cn/w3.js"></script>
<body>
    <h2>测试 HTML中的 W3.JS</h2>
    
    <p>点击按钮添加红色背景颜色给包含 id="London" 的元素.</p>
    
    <p>
    <button onclick="w3.addStyle('#London','background-color','red')">添加样式</button>
    </p>
    
    <div id="London" class="city" style="background-color:green">
      <h2>伦敦</h2>
      <p>伦敦是英国的首都.</p>
    </div>
</body>
</html>
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