實現效果如上,代碼如下:
<div class="btn-group dropup">
<button class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">按鈕下拉菜單<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="##">按鈕下拉菜單項</a></li>
<li><a href="##">按鈕下拉菜單項</a></li>
<li><a href="##">按鈕下拉菜單項</a></li>
<li><a href="##">按鈕下拉菜單項</a></li>
</ul>
</div>