easyui treegrid 默认子集折叠

返回的数据增加 "state":" closed ",


[{
"id":1,
"name":"C",
"size":"",
"date":"02/19/2010",,
"state":"closed", ,
"children":[{
"id":2,
"name":"Program Files",
"size":"120 MB",
"date":"03/20/2010",
"state":"closed",
"children":[{

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