OC中isKindOfClass与isMemberOfClass的区别

- (void)viewDidLoad {
    [super viewDidLoad];
    
    People *people = [[People alloc] init];
    Student *student   = [[Student alloc] init];
    
    if ([people isKindOfClass:[People class]]) {
        NSLog(@"people iskinofclass People");
    }
    
    if ([people isKindOfClass:[NSObject class]]) {
        NSLog(@"people iskinofclass NSObject");
    }
  
    if ([student isMemberOfClass:[Student class]]) {
        NSLog(@"student ismemberOfClass People");
    }
    
    if (![student isMemberOfClass:[NSObject class]]) {
        NSLog(@"student isbelog NSObject");
    }
}

    BOOL rez1 = [(id)[NSObject class] isKindOfClass:[NSObject class]];
    BOOL rez2 = [(id)[NSObject class] isMemberOfClass:[NSObject class]];
    BOOL rez3 = [(id)[Student class] isKindOfClass:[People class]];
    BOOL rez4 = [(id)[Student class] isMemberOfClass:[Student class]];