try_class_5 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 {
        background-color: orange;
        font-size: 20px;
        padding: 16px;
        color: white;
    }
</style>
    <script src="https://7npmedia.w3cschool.cn/w3.js"></script>
<body>
    <h2>测试 HTML 中的 W3.JS</h2>
    
    <p>点击按钮将 marked 类添加到所有包含 class='city'的元素中.</p>
    
    <p><button onclick="w3.addClass('.city','marked')">添加类</button></p>
    <div id="London" class="city">
      <h2>伦敦</h2>
      <p>伦敦是英国的首都.</p>
    </div>
    
    <div id="Paris" class="city">
      <h2>巴黎</h2>
      <p>巴黎是法国的首都.</p> 
    </div>
    
    <div id="Tokyo" class="city">
      <h2>东京</h2>
      <p>东京是日本的首都.</p>
    </div>
</body>
 
 
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运行结果
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