Enter<script src="https://cdn.bootcss.com/jquery/3.4.1/core.js"></script>, but it has no effect when opening it in the browser?
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Check if there is an error in js and there is no problem with the imported resources
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
