> db.addUser("ydkt","ydkt")2015-06-19T09:22:37.004+0800 E QUERY    TypeError: Property 'addUser' of object admin is not a function    at (shell):1:4>

原来在mongodb3.0中addUser已被废弃，具体参考：

http://docs.mongodb.org/manual/reference/method/db.createUser/#create-administrative-user-with-roles

> db.createUser({user:'ydkt',pwd:'ydkt',roles:['readWrite','dbAdmin']})Successfully added user: { "user" : "ydkt", "roles" : [ "readWrite", "dbAdmin" ] }>