bootstrap3手风琴

 bootstrap3手风琴：

<link rel="stylesheet" href="http://cdn.bootcss.com/twitter-bootstrap/3.0.3/css/bootstrap.min.css">

<!-- 可选的Bootstrap主题文件（一般不用引入） -->
<link rel="stylesheet" href="http://cdn.bootcss.com/twitter-bootstrap/3.0.3/css/bootstrap-theme.min.css">

<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
<script src="http://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script>

<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="http://cdn.bootcss.com/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>

<div style="width: 200px;">
			<div class="panel-group" id="accordion2">
			<div class="panel-heading">
				<strong style="font-size: 30px;">论坛分类</strong>
			</div>
				<div class="panel panel-default">
					<div class="panel-heading" data-toggle="collapse"
						data-parent="#accordion2" href="#collapseOne">
						<a class="accordion-toggle">Java</a>
					</div>
					<div id="collapseOne" class="panel-collapse collapse"
						style="height: 0px;">
						<div class="panel-body">
							<ul class="nav nav-pills nav-stacked">
								<li><a href="#">Java基础</a></li>
								<li><a href="#">Java面向对象</a></li>
								<li><a href="#">Java核心API</a></li>
								<li><a href="#">JavaEE</a></li>
							</ul>
						</div>
					</div>
				</div>
				<div class="panel panel-default">
					<div class="panel-heading" data-toggle="collapse"
						data-parent="#accordion2" href="#collapseTwo">
						<a class="accordion-toggle">数据库</a>
					</div>
					<div id="collapseTwo" class="panel-collapse collapse"
						style="height: 0px;">
						<div class="panel-body">
							<ul class="nav nav-pills nav-stacked">
								<li><a href="#">SQL基础</a></li>
								<li><a href="#">Oracle</a></li>
								<li><a href="#">MySQL</a></li>
							</ul>
						</div>
					</div>
				</div>
				<div class="panel panel-default">
					<div class="panel-heading" data-toggle="collapse"
						data-parent="#accordion2" href="#collapseThree">
						<a class="accordion-toggle">技术前沿</a>
					</div>
					<div id="collapseThree" class="panel-collapse in"
						style="height: 0px;">
						<div class="panel-body">
							<ul class="nav nav-pills nav-stacked">
								<li><a href="#">NoSQL</a></li>
								<li><a href="#">Hadoop</a></li>
								<li><a href="#">WebService</a></li>
							</ul>
						</div>
					</div>
				</div>
			</div>
		</div>

注意: 手风琴是否打开受class="panel-collapse in" style="height:0px;" 隐藏
class="panel-collapse in" style="height:auto;" 打开

效果: