代码示例：（标识：bs_collapsible_accordion）
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="p-4">
<h2>手风琴实例</h2>
<p><strong>注释：</strong><code>data-bs-parent</code> 属性确保在显示可折叠项目之一时，将关闭指定父项下的所有可折叠元素。</p>
<div id="accordion">
<div class="card">
<div class="card-header">
<a class="btn" data-bs-toggle="collapse" href="#collapseOne">
可折叠组项目 #1
</a>
</div>
<div id="collapseOne" class="collapse show" data-bs-parent="#accordion">
<div class="card-body">
<h3>春日</h3>
<p>胜日寻芳泗水滨，无边光景一时新。</p>
<p>等闲识得东风面，万紫千红总是春。</p>
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<a class="collapsed btn" data-bs-toggle="collapse" href="#collapseTwo">
可折叠组项目 #2
</a>
</div>
<div id="collapseTwo" class="collapse" data-bs-parent="#accordion">
<div class="card-body">
<h3>初夏绝句</h3>
<p>纷纷红紫已成尘，布谷声中夏令新。</p>
<p>夹路桑麻行不尽，始知身是太平人。</p>
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<a class="collapsed btn" data-bs-toggle="collapse" href="#collapseThree">
可折叠组项目 #3
</a>
</div>
<div id="collapseThree" class="collapse" data-bs-parent="#accordion">
<div class="card-body">
<h3>山行</h3>
<p>远上寒山石径斜，白云生处有人家。</p>
<p>停车坐爱枫林晚，霜叶红于二月花。</p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
