How to get 4 treasures under each major category according to each major category. The following code has been implemented to generate babies based on categories, but the babies under all categories are obtained based on the first category. I don’t know what needs to be modified, could you please explain it. 
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
No more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou, no more Doudou.