ztree异步加载显示undefined

 var setting = {  
        data: {  
            simpleData: {  
                enable: true,  
                idKey: "id",  
                pIdKey: "parentid",  
                rootPId: 0  
            }  
        },  
        async: {  
            enable: true,  
            url: "<%=basePath%>agency/listallBytree",  
            autoParam: ["id"]  
        },  
        // 回调函数  
        callback : {  
            onClick : function(event, treeId, treeNode, clickFlag) {  
                // 判断是否父节点  
                if(!treeNode.isParent){  
                    alert("treeId自动编号：" + treeNode.tId + ", 节点id是：" + treeNode.id + ", 节点文本是：" + treeNode.agencyname);  
                }  
            }  

        }  

    };  

    $(document).ready(function () {  
        $.fn.zTree.init($("#agency_tree"), setting);  
    }); 

返回的json没有那么name的键值？