Bootstrap3 简单的可折叠组件—

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"> 
    <title>Bootstrap3 简单的可折叠组件 - 迹忆客(jiyik.com)</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
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<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>