Bootstrap 折叠（Collapse）插件

详情见http://www.runoob.com/bootstrap/bootstrap-collapse-plugin.html

自己也写了一个小例子：欢迎参考哦

<div  class="panel-group" role="tablist" id="accordion" aria-multiselectable="false" >
    <div class="panel panel-default">
        <div class="panel-heading" role="tab" id="headingSubject">
            <h4 class="panel-title">
                <a data-toggle="collapse" data-parent="#accordion" aria-expanded="true" href="#collapseSubject" aria-controls="collapseSubject">这是个Panel</a>
            </h4>
        </div>
        <div class="panel-collapse collapse" id="collapseSubject" role="tabpanel" aria-labelledby="headingSubject">
            <div class="panel-body">
                <div class="form-group">
                    <div class="col-md-6">
                        <a href="@Url.Action("Index","Home")">About</a>
                    </div>
                    <div class="col-md-6">
                        <a href="~/Views/Home/Contact.cshtml">Contact</a>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
   

效果如下：