> db.system.users.update({"_id" : ObjectId("529e67553992b24438d5e315")},{"user":"tank2","readOnly" : false,"pwd":"123"})
> db.system.users.find();
{ "_id" : ObjectId("529e5f8474b4c660718a70f3"), "user" : "tank1", "readOnly" : false, "pwd" : "35dd47abff098f5b4f0b567db8edeac5" }
{ "_id" : ObjectId("529e67553992b24438d5e315"), "user" : "tank2", "readOnly" : false, "pwd" : "123" } //這樣就不對了
> db.addUser('tank2','111')
{
"_id" : ObjectId("529e6f1c8d95afd190add450"),
"user" : "tank2",
"readOnly" : false,
"pwd" : "6b4334d2c97c526e6a11b2f9ce1996e0"
}