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<meta charset="utf-8">
<title>按钮插件--按钮状态切换</title>
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body{padding:10px;margin:10px}
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<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title"><a href="#aa1" data-toggle="collapse" data-parent="#accordion">标题一</a></h4>
</div>
<div class="panel-collapse collapse in" id="aa1">
<div class="panel-body">标题一对应的内容</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title"><a href="#aa2" data-toggle="collapse" data-parent="#accordion" >标题二</a></h4>
</div>
<div class="panel-collapse collapse" id="aa2">
<div class="panel-body">标题二对应的内容</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title"><a href="#aa3" data-toggle="collapse" data-parent="#accordion">标题三</a></h4>
</div>
<div class="panel-collapse collapse" id="aa3">
<div class="panel-body">标题三对应的内容</div>
</div>
</div>
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