try_w3examples_271 在线代码实例

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<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<div class="w3-container">
    <h2>活动标签</h2>
    <p>要突出显示用户当前所在的标签/页面，请添加颜色类别，然后使用JavaScript更新活动链接。</p>
    <div class="w3-bar w3-black">
        <button class="w3-bar-item w3-button tablink w3-red" onclick="openCity(event,'London')">伦敦</button>
        <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Paris')">巴黎</button>
        <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Tokyo')">东京</button>
    </div>
    <div id="London" class="w3-container w3-border city">
        <h2>伦敦</h2>
        <p>伦敦是英格兰的首都。</p>
    </div>
    <div id="Paris" class="w3-container w3-border city" style="display:none">
        <h2>巴黎</h2>
        <p>巴黎是法国的首都。</p>
    </div>
    <div id="Tokyo" class="w3-container w3-border city" style="display:none">
        <h2>东京</h2>
        <p>东京是日本的首都。</p>
    </div>
</div>
 
 
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运行结果
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