TreeGrid数据显示问题

haikely

            <div id="gcMaster" class="mini-treegrid" style="width:100%;height:90%;" showTreeIcon="true"
                treeColumn="PersonName" idField="UId" parentField="ParentUId" resultAsTree="false"
                showCheckBox="true" checkRecursive="true" url="../../TestData.txt">
                <div property="columns">
                    <div name="PersonName" field="PersonName" width="200">职工姓名</div>
                    <div field="Sex" width="100">性别</div>
                </div>
            </div>            


[{"UId":"001","ParentUId":"","PersonId":"001","PersonName":"后勤","Sex":0},

{"UId":"00001","ParentUId":"001","PersonId":"00001","PersonName":"李老师","Sex":0},

{"UId":"00002","ParentUId":"001","PersonId":"00002","PersonName":"ZhangL","Sex":0},

{"UId":"002","ParentUId":"","PersonId":"002","PersonName":"教务","Sex":0}]

同样这组数据，用txt保存，设定url可以正确显示成树形数据，但是用后台传回，转成JSON对象，用loaddata方法加载，却无法显示成树形数据？

dforce

列表数据请使用loadList(data,"id","pid")方法加载。