<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
    下拉菜单
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
    <li role="presentation" class="dropdown-header">第一部分菜单头部</li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
    <li role="presentation" class="divider"></li>
    <li role="presentation" class="dropdown-header">第二部分菜单头部</li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
    <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
  </ul>
</div> 


<div class="dropdown">
        <button class="btn btn-info dropdown-toggle" data-toggle="dropdown">
            选择运动
        </button>
        <ul class="dropdown-menu">
            <li class="dropdown-header">第一部分标题</li>
            <li><a href="javascript:void(0)">足球</a></li>
            <li><a href="javascript:void(0)">篮球</a></li>
            <li><a href="javascript:void(0)">乒乓球</a></li>
            <li class="divider"></li>
            <li class="dropdown-header">蔬菜</li>
            <li><a href="javascript:void(0)">足球</a></li>
            <li><a href="javascript:void(0)">篮球</a></li>
            <li><a href="javascript:void(0)">乒乓球</a></li>
        </ul>
</div>