尺寸

按钮式下拉菜单适用所有尺寸的按钮。

<div class="btn-group">
  <button class="btn btn-default btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
    Large button <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu">
    ...
  </ul>
</div>
<div class="btn-group">
  <button class="btn btn-default btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
    Small button <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu">
    ...
  </ul>
</div>
<div class="btn-group">
  <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">
    Extra small button <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu">
    ...
  </ul>
</div>