Boootstrap Collapse插件使用

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<div class="panel-group" id="accordion">
	<div class="panel panel-default">
		<div class="panel-heading">
			<h4 class="panel-title">
				<a data-toggle="collapse" data-parent="#accordion" 
				   href="#collapseOne">
					点击我进行展开，再次点击我进行折叠。第 1 部分
				</a>
			</h4>
		</div>
		<div id="collapseOne" class="panel-collapse collapse in">
			<div class="panel-body">
				Nihil anim keffiyeh helvetica, craft beer labore wes anderson 
				cred nesciunt sapiente ea proident. Ad vegan excepteur butcher 
				vice lomo.
			</div>
		</div>
	</div>
	<div class="panel panel-default">
		<div class="panel-heading">
			<h4 class="panel-title">
				<a data-toggle="collapse" data-parent="#accordion" 
				   href="#collapseTwo">
					点击我进行展开，再次点击我进行折叠。第 2 部分
				</a>
			</h4>
		</div>
		<div id="collapseTwo" class="panel-collapse collapse">
			<div class="panel-body">
				Nihil anim keffiyeh helvetica, craft beer labore wes anderson 
				cred nesciunt sapiente ea proident. Ad vegan excepteur butcher 
				vice lomo.
			</div>
		</div>
	</div>

</div>

1、默认只能展开一项，由data-parent="#accordion"控制，需要展开多项时，去掉即可。

2、class=“collapse"默认折叠，添加.in则展开。

3、对于已经展开的panel，再去调用.collapse('show')方法会出错。