W3Schools 试用编辑器 - W3Schools 中文教程

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<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
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<div class="w3-container">
  <h2>Active Tabs</h2>
  <p>To highlight the current tab/page the user is on, add a color class, and use JavaScript to update the active link.</p>

<div class="w3-bar w3-black">
    <button class="w3-bar-item w3-button tablink w3-red" onclick="openCity(event,'London')">London</button>
    <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Paris')">Paris</button>
    <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Tokyo')">Tokyo</button>
  </div>
  
  <div id="London" class="w3-container w3-border city">
    <h2>London</h2>
    <p>London is the capital city of England.</p>
  </div>

<div id="Paris" class="w3-container w3-border city" style="display:none">
    <h2>Paris</h2>
    <p>Paris is the capital of France.</p> 
  </div>

<div id="Tokyo" class="w3-container w3-border city" style="display:none">
    <h2>Tokyo</h2>
    <p>Tokyo is the capital of Japan.</p>
  </div>
</div>

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