bootstrap的手风琴

<div class="container"> <div class="panel-group" id="mypanel"> <div class="panel panel-default"> <div class="panel-heading"> <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#mypanel" href="#homepage">首页</a> </h4> </div> <div class="panel-collapse collapse in" id="homepage"> <div calss="panel-body">首页内容</div> </div> <div class="panel-heading"> <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#mypanel" href="#savepage">收藏</a> </h4> </div> <div class="panel-collapse collapse" id="savepage"> <div calss="panel-body">收藏内容</div> </div> <div class="panel-heading"> <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#mypanel" href="#labelpage">标签</a> </h4> </div> <div class="panel-collapse collapse" id="labelpage"> <div calss="panel-body">标签内容</div> </div> </div> </div> </div>