Bootstrap手风琴没有关闭

Question

我将手风琴应用到html页面打开了部分，但它没有关闭。我正在使用bootstrap.min.js版本3.2。

以下代码也无效。当我点击链接或按钮div将打开但不关闭。

演示代码

<div class="accordion" id="accordion2">
    <div class="accordion-group">
        <div class="accordion-heading">
            <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseOne">
                Collapsible Group Item #1
            </a>
        </div>
        <div id="collapseOne" class="accordion-body collapse in">
            <div class="accordion-inner">
                Anim pariatur cliche...
            </div>
        </div>
    </div>
    <div class="accordion-group">
        <div class="accordion-heading">
            <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseTwo">
                Collapsible Group Item #2
            </a>
        </div>
        <div id="collapseTwo" class="accordion-body collapse">
            <div class="accordion-inner">
                Anim pariatur cliche...
            </div>
        </div>
    </div>
</div>