html

<div class="fitem">
                <label>上级菜单:</label>
                <input id="top-menu" class="easyui-combotree" name="parentId" data-options="width:'100px'" />
        </div>

js

$("#top-menu").combotree({url:"<%=request.getContextPath() %>/menu.html?act=list"});

接口返回的数据