w3css 在线编辑器 | w3css代码测试

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.cainiaomax.com/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>活动选项卡</h2>
  <p>要突出显示用户所在的当前选项卡/页面，请添加颜色类，并使用 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="巴黎" 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>

</body>
</html>

报个问题: