The uploadify plug-in downloaded from the Internet does not take effect even if I run index.php directly. Is there any solution? 
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Please refer to the operation process: http://ipnx.cn/js-tutorial-393852.html
jquery is not introduced
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
