> db.test.insert(

{'a001':1,name:1}

)
> db.test.find()

{ "_id" : ObjectId("4df1032d0d72806ea662fa1a"), "a001" : 1, "name" : 1 }

> db.test.update(

{name:1}

,{'$set',{'a01':2}})
Fri Jun 10 01:30:55 SyntaxError: missing : after property id (shell):1
> db.test.update(

{name:1}

,{'$set':{'a01':2}})
> db.test.find()

{ "_id" : ObjectId("4df1032d0d72806ea662fa1a"), "a01" : 2, "name" : 1 }

>