Bootstrap 手风琴：防止打开的面板折叠

Question

为了防止当前打开的面板折叠，我使用了 this suggestion. It's working in a JSFiddle，但是当我将所有内容复制到新页面时，它无法防止折叠。我的测试标记如下。

我是不是加载顺序错了？我如何使用它来防止崩溃？

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Example</title>
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" />

  <style>
    div.wrapper {
      margin-right: auto;
      margin-left: auto;
      margin-top: 100px;
      width: 500px;
    }
  </style>

  <script>
    $('#accordionExample').on('show.bs.collapse', function () {
      $(this).data('isShowing', true);
    });

    $('#accordionExample').on('hide.bs.collapse', function (event) {
      if (!$(this).data('isShowing')) {
        event.preventDefault();
      }

      $(this).data('isShowing', false);
    });
  </script>
</head>
<body>
  <div class="wrapper">

    <div class="accordion" id="accordionExample">
      <div class="card">
        <div class="card-header" id="headingOne">
          <h2 class="mb-0">
            <button class="btn btn-link btn-block text-left" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
              Collapsible Group Item #1
            </button>
          </h2>
        </div>

        <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
          <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 VHS.
          </div>
        </div>
      </div>
      <div class="card">
        <div class="card-header" id="headingTwo">
          <h2 class="mb-0">
            <button class="btn btn-link btn-block text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
              Collapsible Group Item #2
            </button>
          </h2>
        </div>
        <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
          <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 VHS.
          </div>
        </div>
      </div>
      <div class="card">
        <div class="card-header" id="headingThree">
          <h2 class="mb-0">
            <button class="btn btn-link btn-block text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
              Collapsible Group Item #3
            </button>
          </h2>
        </div>
        <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">
          <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 VHS.
          </div>
        </div>
      </div>
    </div>

  </div>
</body>
</html>

Answer 1

“我是不是加载顺序错了？”

就是这样。

我将 <script> 元素从文档中移出 <head> 到页面末尾——手风琴之后——它开始工作了。

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