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运行代码 
<!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-sidebar w3-bar-block w3-collapse w3-card w3-animate-right" style="width:200px;right:0;" id="mySidebar">
    <button class="w3-bar-item w3-button w3-large w3-hide-large" onclick="w3_close()">关闭 &times;</button>
    <a href="#" class="w3-bar-item w3-button">链接 1</a>
    <a href="#" class="w3-bar-item w3-button">链接 2</a>
    <a href="#" class="w3-bar-item w3-button">链接 3</a>
</div>
<div class="w3-main" style="margin-right:200px">
    <div class="w3-teal">
        <button class="w3-button w3-teal w3-xlarge w3-right w3-hide-large" onclick="w3_open()">&#9776;</button>
        <div class="w3-container">
            <h1>我的页面</h1>
        </div>
    </div>
    <div class="w3-container">
        <p>在此示例中，侧面导航将始终显示在台式机和笔记本电脑上（屏幕宽度大于992px），隐藏在平板电脑和手机上（屏幕宽度小于992px）。</p>
        <p>在平板电脑和手机上，侧面导航已替换为菜单图标，该菜单图标在单击时会打开导航窗格：然后它将覆盖/坐在页面内容的顶部。</p>
        <p><b>调整浏览器窗口的大小以了解其工作方式。</b></p>
    </div>
</div>
<script>
    function w3_open() {
        document.getElementById("mySidebar").style.display = "block";
 
 
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运行结果
PC端 手机端 平板端