<html>
<head>
<title>Bootstrap 实例 - 简单的可折叠组件</title>
<link href="https://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
<script src="https://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script src="https://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
</head>
<body>
<button type="button" class="btn btn-primary" data-toggle="collapse" data-target="#demo">
简单的可折叠组件
</button>
<div id="demo" class="collapse in">
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</div>
</body>
</html>