【MongoDB学习笔记9】深入MongoDB的更新（update）操作:修改器$inc
> db.post.findOne({"id":0}){
"_id" : ObjectId("54a530c3ff0df3732bac167f"),
"id" : 0,
"name" : "joe",
"age" : 65,
"comments" : {
"1" : 4,
"2" : 2,
"3" : 3
}
}
> db.post.update({"id":0}, {$inc:{"age":6}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
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