- (id)jkobjectAtIndex:(NSUInteger)index {
    if (index >= self.count) {
        YTLog(@"数组越界了------%@", [self class]);
        return nil;
    }

    return [self jkobjectAtIndex:index];
}

- (void)jkinsertObject:(id)anObject atIndex:(NSUInteger)index {
    if (!anObject) {
        YTLog(@"数组内插入了一个nil对象--------%@", [self class]);
        return;
    }

    return [self jkinsertObject:anObject atIndex:index];
}