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代码编辑器：

<!DOCTYPE htm>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<style>body {margin:20px}</style>
<div class="panel-group" id="accordion">
    <div class="panel panel-info">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a data-toggle="collapse" data-parent="#accordion" 
                href="#collapseexample">点我进行展开，再次点我进行折叠 ( shown 事件 )
                </a>
            </h4>
        </div>
        <div id="collapseexample" class="panel-collapse collapse">
            <div class="panel-body">只要用心为用户挖掘想要的功能，这些不谋而合的想法就会不断出现
            </div>
        </div>
    </div>
</div>
<div id="message" style="margin-top:10px"></div>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
$(function(){
    $("#collapseexample").on("show.bs.collapse",function(){
        $("#message").append("<p>" + new Date() + "嘿，当您展开时会输出这条消息");
    })
});
</script>

代码编辑器：

运行结果：