效果图：

源代码：

<!DOCTYPE html>
<html>
<head>
  <title>折叠式导航栏</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.staticfile/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://cdn.staticfile/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.staticfile/popper.js/1.15.0/umd/popper.min.js"></script>
  <script src="https://cdn.staticfile/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container" >
  <h2>折叠式导航栏实例</h2>
   <div id="accordion" style="float:left;width:15%">
    <div class="card">
      <div class="card-header">
        <a class="card-link" data-toggle="collapse" href="#collapseOne">
          个人
        </a>
      </div>
      <div id="collapseOne" class="collapse show" data-parent="#accordion">
        <div class="card-body">
        <a href="#">  最新信息 </a>
        </div>
		  <div class="card-body">
              <a href="#">  会议信息</a>
        </div>
		  <div class="card-body">
             <a href="#">  个人信息</a>
        </div>
      </div>
    </div>
    <div class="card">
      <div class="card-header">
        <a class="collapsed card-link" data-toggle="collapse" href="#collapseTwo">
        会议管理
      </a>
      </div>
      <div id="collapseTwo" class="collapse" data-parent="#accordion">
          <div class="card-body">
             <a href="">  预约会议</a>
        </div>
		    <div class="card-body">
             <a href="">  会议室添加</a>
        </div>
      </div>
    </div>
    <div class="card">
      <div class="card-header">
        <a class="collapsed card-link" data-toggle="collapse" href="#collapseThree">
          账号管理
        </a>
      </div>
      <div id="collapseThree" class="collapse" data-parent="#accordion">
        <div class="card-body">
        <a href="会议室添加">  账号注册</a>
        </div>
		  <div class="card-body">
        <a href="会议室添加">  账号注销</a>
        </div>
      </div>
    </div>
  </div>
</div>
    
</body>
</html>

 

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