try_w3examples_70 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>切换显示/隐藏</h2>
    <p>单击按钮显示/隐藏段落。</p>
    <button onclick="myFunction()" class="w3-btn w3-black">切换隐藏和显示</button>
    <p>第一段</p>
    <p id="Demo" class="w3-hide w3-red">第二段</p>
</div>
<script>
    function myFunction() {
        var x = document.getElementById("Demo");
        if (x.className.indexOf("w3-show") == -1) {
            x.className += " w3-show";
        } else {
            x.className = x.className.replace(" w3-show", "");
        }
    }
</script>
</body>
</html>
 
 
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运行结果
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