easyui treeGrid 加载时折叠子节点

 <table id="unit_list_grid" class="easyui-treegrid"
            data-options="              
                rownumbers:true,
                url:'${pageContext.request.contextPath }/sysUnit/showList.do',
                idField : 'id',
                treeField : 'name',
                fit:true,   
                parentField : 'parentId',
                fitColumns : true,
                animate:true,
                state:'closed',
                onClickRow:function(row) {UnitList.onClikNode(row)},
                onLoadSuccess:function(row, data){UnitList.onLoadSuccess(row, data)},
                onContextMenu: function(e,node){UnitList.showRight(e,node);}">
            <thead>
                <tr>
                    <th data-options="field:'id',hidden:true"></th>
                    <th data-options="field:'name',width:180">单位名称</th>
                    <th data-options="field:'coding',width:100">单位编号</th>
                    <th data-options="field:'type',width:180">单位类型</th>
                    <th data-options="field:'status',width:80,
                        formatter: function(value,row,index){if (row.status==1){return '启用';} else {return '停用';}}">状态</th>
                </tr>
            </thead>
        </table>

        这是表格，默认值显示第一级和第二级节点数据怎么实现？，网上查了一下，还是没搞明白

看tree的state配置，默认为open，大于3级的数据节点增加state:'close'

 Tree Data Format

Every node can contains following properties:

    id: node id, which is important to load remote data
    text: node text to show
    state: node state, 'open' or 'closed', default is 'open'. When set to 'closed', the node have children nodes and will load them from remote site
    checked: Indicate whether the node is checked selected.
    attributes: custom attributes can be added to a node
    children: an array nodes defines some children nodes