<title>Bootstrap3 折叠（Collapse）插件事件 - 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>
<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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<script type="text/javascript">
$('#collapseexample').on('show.bs.collapse', function () { alert('嘿，当您展开时会提示本警告');})