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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>
<div class="w3-bar w3-red">
    <a href="#" class="w3-bar-item w3-button">主页</a>
    <a href="#" class="w3-bar-item w3-button w3-hide-small">链接 1</a>
    <a href="#" class="w3-bar-item w3-button w3-hide-small">链接 2</a>
    <a href="#" class="w3-bar-item w3-button w3-hide-small">链接 3</a>
    <a href="javascript:void(0)" class="w3-bar-item w3-button w3-right w3-hide-large w3-hide-medium" onclick="myFunction()">&#9776;</a>
</div>
<div id="demo" class="w3-bar-block w3-red w3-hide w3-hide-large w3-hide-medium">
    <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-container">
    <p>在本例中，当显示在平板电脑和移动设备上时，导航栏将被右上角的按钮（☰）替换。单击按钮时，栏中的链接将垂直堆叠。</p>
    <p>调整屏幕大小以查看效果。</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", "");
 
 
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运行结果
PC端 手机端 平板端