MJExtension的Bug:一个类文件中声明了Parent 和 Son两个类,Parent类中有一个属性@property (nonatomic, strong) Son *son;通过 `[Parent mj_objectWithKeyValues
1.Parent.h:@classSon;@interfaceParent:NSObject@property(nonatomic,strong)Son*son;@end#pragmamark-son@interfaceSon:NSObject@property(nonatomic,copy)NSString*name;@end2.Parent.m@implementationParent@end