<title>Bootstrap 实例 - 折叠（Collapse）插件事件</title>
<link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
<script src="/js/bootstrap/jquery.min.js"></script>
<script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
<div class="panel-group" id="accordion">
<div class="panel panel-info">
<div class="panel-heading">
<a data-toggle="collapse" data-parent="#accordion"
点击我进行展开，再次点击我进行折叠。--shown 事件
<div id="collapseexample" class="panel-collapse collapse">
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