twitter-bootstrap – Bootstrap 4从下拉按钮中删除插入符号

在Bootstrap 3中,您可以从下拉按钮轻松删除“插入符号”(指向下方的小箭头),但我无法看到如何在Bootstrap 4中执行此操作,因为它们不再使用< span class =“caret”&gt ;< /跨度取代.

<div class="input-group mb-3">
  <div class="input-group-prepend">
    <button class="btn btn-outline-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</button>
    <div class="dropdown-menu">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <a class="dropdown-item" href="#">Something else here</a>
      <div role="separator" class="dropdown-divider"></div>
      <a class="dropdown-item" href="#">Separated link</a>
    </div>
  </div>
  <input type="text" class="form-control" aria-label="Text input with dropdown button">
</div>
它是在css中完成的.做那样的事情:

.dropdown-toggle:after { content: none }
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