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单击该按钮时,必须动态删除div元素中的“in”类。单击按钮时动态删除引导程序中的类“in”动态按钮
<div class="container">
<h2>Simple Collapsible</h2>
<p>Click on the button to toggle between showing and hiding content.</p>
<button type="button" class="btn btn-info" data-toggle="collapse" data-target="#demo">Simple collapsible</button>
<div id="demo" class="collapse in">
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod.
</div>
</div>