对银行账户文档进行排序 ~~~ db.accounts.aggregate([ { $sort:{ balacne:1,"name.lastName":-1 } } ]) ~~~ 返回内容 ``` { "_id" : ObjectId("60d2cb85c9b0d831c97763eb"), "name" : { "firstName" : "bob", "lastName" : "yang" }, "balance" : 20 } { "_id" : ObjectId("60d2cb85c9b0d831c97763ea"), "name" : { "firstName" : "alice", "lastName" : "wong" }, "balance" : 50 } ```