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The pop-up window has no output object
The problem is solved, there is a colon missing in front of the url in the JS of html
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The problem is solved, there is a colon missing in front of the url in the JS of html