If you use the tp framework, you can directly introduce it, instantiate it and call it.
If you are not using it in a framework, you need to load the file yourself. Framework: Such as tp framework, they are all automatically loaded. After you use a class, the file will be automatically loaded. So in fact, after a use class comes in, it still needs to load the file.
If I understand correctly, this is what it looks like.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
If you use the tp framework, you can directly introduce it, instantiate it and call it.
If you are not using it in a framework, you need to load the file yourself. Framework: Such as tp framework, they are all automatically loaded. After you use a class, the file will be automatically loaded. So in fact, after a use class comes in, it still needs to load the file.
If I understand correctly, this is what it looks like.