<div class="poj-name">
    <span class="name">WWUJ-1</span>
    <div class="btn-group">
        <a class=" btn" data-toggle="dropdown">
            <span class="fa fa-caret-down" data-toggle="tooltip" data-placement="bottom" title="切换标段"></span>
        </a>
        <div class="dropdown-menu">
            <a href="#" class="dropdown-item">WWUJ-2</a>
            <a href="#" class="dropdown-item">WWUJ-3</a>
            <a href="#" class="dropdown-item">WWUJ-4</a>
        </div>
    </div>
</div>