我对这段代码有疑问-overridefuncdidReceiveMemoryWarning(){super.didReceiveMemoryWarning()//Disposeofanyresourcesthatcanberecreated.}funcget(){leturl=NSURL(string:"http://www..php")letdata=NSData(contentsOfURL:url!)values=try!NSJSONSerialization.JSONObjectWithData(data!,options:NSJSONReadingOptions.Mutable