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First check whether the js reports an error, and secondly whether the $id is passed to the php side and whether the correct ID can be printed out
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
First check whether the js reports an error, and secondly whether the $id is passed to the php side and whether the correct ID can be printed out