我有这样的文件。[{"_id":ObjectId("aaa"),"host":"host1","artData":[{"aid":"56004721","accessMin":NumberLong(1481862180},{"aid":"56010082","accessMin":NumberLong(1481861880)},{"aid":"55998802","accessMin":NumberLong(1481861880)}]},{"_id":ObjectId("bbb"),"host":"host2","artData":[{"aid":"55922560","accessM