因项目开发需要，要实现easyui tree在同一时间只展开一个目录，其他的目录则处理收缩状态，求高人指点！
------解决方案--------------------
<ul class="easyui-tree">
<li>
<span>My Documents</span>
<ul>
<li data-options="state:'closed'">
<span>Photos</span>
<ul>
<li>
<span>Friend</span>
</li>
<li>
<span>Wife</span>
</li>
<li>
<span>Company</span>
</li>
</ul>
</li>
<li>
<span>Program Files</span>
<ul>
<li>Intel</li>
<li>Java</li>
<li>Microsoft Office</li>
<li>Games</li>
</ul>
</li>
<li>index.html</li>
<li>about.html</li>
<li>welcome.html</li>
</ul>
</li>
</ul>
data-options="state:'closed'" 关闭