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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">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<div class="w3-sidebar w3-bar-block w3-light-grey w3-card" style="width:160px;">
    <a href="#" class="w3-bar-item w3-button">链接 1</a>
    <button class="w3-button w3-block w3-left-align" onclick="myAccFunc()">
        折叠栏 <i class="fa fa-caret-down"></i>
    </button>
    <div id="demoAcc" class="w3-hide w3-white w3-card">
        <a href="#" class="w3-bar-item w3-button">链接</a>
        <a href="#" class="w3-bar-item w3-button">链接</a>
    </div>
    <div class="w3-dropdown-click">
        <button class="w3-button" onclick="myDropFunc()">
            下拉 <i class="fa fa-caret-down"></i>
        </button>
        <div id="demoDrop" class="w3-dropdown-content w3-bar-block w3-white w3-card">
            <a href="#" class="w3-bar-item w3-button">链接</a>
            <a href="#" class="w3-bar-item w3-button">链接</a>
        </div>
    </div>
    <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" style="margin-left:160px">
    <h2>侧栏折叠栏</h2>
 
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