try_w3examples_229 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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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>活动折叠栏</h2>
    <p>在此示例中，我们将w3-red类添加到活动的折叠栏中（单击按钮并打开内容时）。</p>
    <button onclick="myFunction('Demo1')" class="w3-button w3-block w3-black w3-left-align">打开第一节</button>
    <div id="Demo1" class="w3-hide w3-container">
        <p>一些文字..</p>
    </div>
    <button onclick="myFunction('Demo2')" class="w3-button w3-block w3-black w3-left-align">打开第二节</button>
    <div id="Demo2" class="w3-hide w3-container">
        <p>其他一些文字..</p>
    </div>
</div>
<script>
    function myFunction(id) {
        var x = document.getElementById(id);
        if (x.className.indexOf("w3-show") == -1) {
            x.className += " w3-show";
            x.previousElementSibling.className =
                x.previousElementSibling.className.replace("w3-black", "w3-red");
        } else {
            x.className = x.className.replace(" w3-show", "");
            x.previousElementSibling.className =
 
 
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运行结果
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