Bootstrap 崩溃，手风琴不起作用

Question

我需要一个折叠和显示功能..

我的代码如下

<div class="accordion" id="Preview">
      <div class="card z-depth-0 bordered">
        <div class="card-header" id="headingOne2">
          <h5 class="mb-0">
            <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapseOne2"
              aria-expanded="true" aria-controls="collapseOne2">
              Collapsible Group Item #1
            </button>
          </h5>
        </div>
        <div id="collapseOne2" class="collapse" aria-labelledby="headingOne2"
          data-parent="#Preview">
          <div class="card-body">
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3
            wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum
            eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
            assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
            nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
            farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus
            labore sustainable.
          </div>
        </div>
      </div>
      <div class="card z-depth-0 bordered">
        <div class="card-header" id="headingTwo2">
          <h5 class="mb-0">
            <button class="btn btn-link collapsed" type="button" data-toggle="collapse"
              data-target="#collapseTwo2" aria-expanded="false" aria-controls="collapseTwo2">
              Collapsible Group Item #2
            </button>
          </h5>
        </div>
        <div id="collapseTwo2" class="collapse" aria-labelledby="headingTwo2"
          data-parent="#Preview">
          <div class="card-body">
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3
            wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum
            eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
            assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
            nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
            farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus
            labore sustainable.
          </div>
        </div>
      </div>
      <div class="card z-depth-0 bordered">
        <div class="card-header" id="headingThree2">
          <h5 class="mb-0">
            <button class="btn btn-link collapsed" type="button" data-toggle="collapse"
              data-target="#collapseThree2" aria-expanded="false" aria-controls="collapseThree2">
              Collapsible Group Item #3
            </button>
          </h5>
        </div>
        <div id="collapseThree2" class="collapse" aria-labelledby="headingThree2"
          data-parent="#Preview">
          <div class="card-body">
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3
            wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum
            eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
            assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred
            nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
            farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus
            labore sustainable.
          </div>
        </div>
      </div>
    </div>

但它不工作..按钮是这样来的..但没有折叠并显示卡内的数据。

[![image of output][1]][1]

hover一切正常，但没有崩溃。 [1]： https://i.stack.imgur.com/ndr4I.png

原因是什么？

Answer 1

我在头中使用以下文件和脚本运行了您的脚本，它按预期工作。 您可能缺少其中之一或没有最新版本？

# Bootstrap CSS
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

# Jquery
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>

# Bootstrap JS
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>