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光阴似箭催人老，日月如移越少年。
Right-click on your project, select the last properties-javabulidpath, and then select add external jars in the libraries on the right to introduce the external jar package
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Right-click on your project, select the last properties-javabulidpath, and then select add external jars in the libraries on the right to introduce the external jar package