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單擊該按鈕時,必須動態刪除div元素中的「in」類。單擊按鈕時動態刪除引導程序中的類「in」動態按鈕
<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>