这里没什么好说的，直接贴文了
MongoDB provides the following methods for updating documents in a collection:
db.collection.updateOne() |
Updates at most a single document that match a specified filter even though multiple documents may match the specified filter. New in version 3.2. |
db.collection.updateMany() |
Update all documents that match a specified filter. New in version 3.2. |
db.collection.replaceOne() |
Replaces at most a single document that match a specified filter even though multiple documents may match the specified filter. New in version 3.2. |
db.collection.update() |
Either updates or replaces a single document that match a specified filter or updates all documents that match a specified filter. By default, the |
The following methods can also update documents from a collection:
db.collection.findOneAndReplace().db.collection.findOneAndUpdate().db.collection.findAndModify().db.collection.save().db.collection.bulkWrite().See the individual reference pages for the methods for more information and examples.
原文：http://www.cnblogs.com/olinux/p/7267299.html