正确

练习:

添加所需的类和属性来创建一个下拉列表。

<div class="dropdown"> <button data-toggle="dropdown" class="btn btn-primary dropdown-toggle"> Dropdown Example <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </div>

<div class="dropdown"> <button data-toggle='dropdown' class="btn btn-primary dropdown-toggle"> Dropdown Example <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </div>

<div class="dropdown"> <button DATA-TOGGLE="dropdown" class="btn btn-primary dropdown-toggle"> Dropdown Example <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </div>

<div class="dropdown"> <button DATA-TOGGLE='dropdown' class="btn btn-primary dropdown-toggle"> Dropdown Example <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </div>

不正确

点击此处重试

正确

下一题 ❯

<div class="w3exercise_input_no_0
">
  <button w3exercise_input_no_1

  class="btn btn-primary w3exercise_input_no_2
">
  Dropdown Example
  <span class="caret"></span></button>
  <ul class="w3exercise_input_no_3
">
    <li><a href="#">HTML</a></li>
    <li><a href="#">CSS</a></li>
    <li><a href="#">JavaScript</a></li>
  </ul>
</div>