The pop-up window cannot be displayed, does anyone know what's going on? The prompt is that it is undefined, but I referenced and copied the two codes from the teacher, but neither worked. It kept prompting that it was undefined
replyThe error reported was that the jump function was undefined, but when I restarted it last night, it worked fine. When I pasted the code, it showed this error again. The point is that my controller only renders, and it's also drunk. When I have time, I will compare the codes on both sides and confirm.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
You need to be able to read error messages,
Just look for them based on the information