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实例代码( Tip: 登录后体验更佳 )
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>
<!-- Sidebar -->
<div class="w3-sidebar w3-bar-block" style="display:none" id="mySidebar">
    <button onclick="w3_close()" class="w3-bar-item w3-button w3-large">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>
<!-- Page Content -->
<div class="w3-teal">
    <button class="w3-button w3-teal w3-xlarge" onclick="w3_open()">☰</button>
    <div class="w3-container">
        <h1>我的页面</h1>
    </div>
</div>
<img src="https://atts.w3cschool.cn/img_car.jpg" alt="Car" style="width:100%">
<div class="w3-container">
    <p>在此示例中，边栏是隐藏的（样式=“ display：none”）</p>
    <p>当您单击左上角的菜单图标时，将显示它。</p>
    <p>打开时，它将隐藏所有页面内容（style.width =“ 100％”）。</p>
</div>
<script>
    function w3_open() {
 
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运行结果
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