我在没有ARC的XCode6.4下测试copy/retain属性。@property(nonatomic,retain)NSMutableString*retainString;@property(nonatomic,copy)NSMutableString*copyedString;@synthesizecopyedString,retainString;NSMutableString*mStr=[NSMutableStringstringWithFormat:@"abc"];retainString=mStr;copyedString=mStr;NSLog(@"mStr:%p",m