easyUI中的treeGrid---加载数据的格式

easyUI中使用treeGrid的时候，加载数据的json格式有几种 ：

1、如下所示：

[{
	"id":1,
	"name":"C",
	"size":"",
	"date":"02/19/2010",
	"children":[{
		"id":2,
		"name":"Program Files",
		"size":"120 MB",
		"date":"03/20/2010",
		"children":[{
			"id":21,
			"name":"Java",
			"size":"",
			"date":"01/13/2010",
			"state":"closed",
			"children":[{
				"id":211,
				"name":"java.exe",
				"size":"142 KB",
				"date":"01/13/2010"
			},{
				"id":212,
				"name":"jawt.dll",
				"size":"5 KB",
				"date":"01/13/2010"
			}]
		}]

这个时候加载完成之后，treeGrid得到的数据的数据格式转换为如下：

可以看出来treegrid数据格式里面包括_parentId和children两个属性，在项目开发的时候可以只需要定义其中一个就可以创建一颗树，子节点会默认将_parentId赋值，但是如果找不到有上一节点，该值就是undifined.所以可以得到下面一个定义json格式的方式。

2、

{"total":7,"rows":[
	{"id":1,"name":"All Tasks","begin":"3/4/2010","end":"3/20/2010","progress":60,"iconCls":"icon-ok"},
	{"id":2,"name":"Designing","begin":"3/4/2010","end":"3/10/2010","progress":100,"_parentId":1,"state":"closed"},
	{"id":21,"name":"Database","persons":2,"begin":"3/4/2010","end":"3/6/2010","progress":100,"_parentId":2},
	{"id":22,"name":"UML","persons":1,"begin":"3/7/2010","end":"3/8/2010","progress":100,"_parentId":2},
	{"id":23,"name":"Export Document","persons":1,"begin":"3/9/2010","end":"3/10/2010","progress":100,"_parentId":2},
	{"id":3,"name":"Coding","persons":2,"begin":"3/11/2010","end":"3/18/2010","progress":80},
	{"id":4,"name":"Testing","persons":1,"begin":"3/19/2010","end":"3/20/2010","progress":20}
],"footer":[
	{"name":"Total Persons:","persons":7,"iconCls":"icon-sum"}
]}