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给collection：AuthCode 设置过期时间Expire Date 为5分钟 ：
db.AuthCode.ensureIndex({"createdAt": 1},{expireAfterSeconds: 300})
步骤：
- [root@app bin]# ./mongo 127.0.0.1:27017
- MongoDB shell version: 3.0.6
- connecting to: 127.0.0.1:27017/test
- > use appdb
- switched to db appdb
- > db.auth("appUser","12345678")
- 1
- > show collections
- system.indexes
- test
- > db.createCollection('AuthCode')
- { "ok" : 1 }
- > show collections
- AuthCode
- system.indexes
- test
- > db.AuthCode.ensureIndex({"createdAt": 1},{expireAfterSeconds: 300})
- {
- "createdCollectionAutomatically" : false,
- "numIndexesBefore" : 1,
- "numIndexesAfter" : 2,
- "ok" : 1
- }
- > db.AuthCode.find()
- { "_id" : ObjectId("56f2538c65a85d5d2ce01d26"), "mobile" : "12345678901", "code" : "471892", "createdAt" : ISODate("2016-03-23T08:27:56.572Z") }
- >
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