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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