mongodb排序怎么用？

>db.COLLECTION_NAME.find().sort({KEY:1})

{ "_id" : ObjectId(5983548781331adf45ec5), "title":"MongoDB Overview"}

{ "_id" : ObjectId(5983548781331adf45ec6), "title":"NoSQL Overview"}

{ "_id" : ObjectId(5983548781331adf45ec7), "title":"Yiibai Overview"}

>db.mycol.find({},{"title":1,_id:0}).sort({"title":-1})

{"title":"Tutorials Yiibai Overview"}

{"title":"NoSQL Overview"}

{"title":"MongoDB Overview"}

>