业精于勤，荒于嬉;行成于思，毁于随。
Three pictures are better than words. The key is breakpoint debugging. Add the JDK source code and you can understand everything~
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Three pictures are better than words. The key is breakpoint debugging. Add the JDK source code and you can understand everything~