我是mongodb新手，正在尝试学习Mongodb查询{"_id":ObjectId("59815d4704ca1760a45957ca"),"userEmail":"lk@gmail.com","expenseAmount":200,"expenseRemark":"aa","expenseCategory":"billing","entryTime":ISODate("2017-08-02T05:03:57Z"),"__v":0}{"_id":ObjectId("59815d5404ca1760a45957cb"),"userEmail":"lk@gmail.com","expen

我是mongodb新手，正在尝试学习Mongodb查询{"_id":ObjectId("59815d4704ca1760a45957ca"),"userEmail":"lk@gmail.com","expenseAmount":200,"expenseRemark":"aa","expenseCategory":"billing","entryTime":ISODate("2017-08-02T05:03:57Z"),"__v":0}{"_id":ObjectId("59815d5404ca1760a45957cb"),"userEmail":"lk@gmail.com","expen