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$conn reported an error as undefined
Where is the code? Just say this. Who knows what you want to say
This means that this variable is not defined.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Where is the code? Just say this. Who knows what you want to say
This means that this variable is not defined.