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Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>

<div class="container mt-3">
  <h2>下拉菜单</h2>
  <p>在 Bootstrap5 中下拉菜单 select 元素可以使用 .form-select 类来渲染 :</p>
  <form action="">
    <label for="sel1" class="form-label">单选下拉菜单：</label>
    <select class="form-select" id="sel1" name="sellist1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
    </select>
    <br>
    
    <label for="sel2" class="form-label">多选下拉菜单：</label>
    <select multiple class="form-select" id="sel2" name="sellist2">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
    <button type="submit" class="btn btn-primary mt-3">Submit</button>
  </form>
</div>