下拉列表选择之后，如何实现在选择框里显示被选择的那一个值？

Question

点开下拉列表之后，随便点击选择一个之后，又返回原来的样子... 不是应该选中哪个后，在选择框button里显示对应的值吗？

<div class="dropdown">

        <button class="btn btn-default dropdown-toggle" data-toggle="dropdown">下拉菜单

            <span class="caret"></span>

        </button>

        <ul class="dropdown-menu">

            <li><a href="#">第一项</a></li>

            <li><a href="#">第二项</a></li>

            <li><a href="#">第三项</a></li>

        </ul>

    </div>

<select>标签可以，那么bootstrap怎么实现该功能？

Answer 1

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