1：brew 安装软件包为何要最新xcode？2：从apple 官网下载xcode 8.2后电脑上存在两个版本了，需要删除老版本么？
闭关修行中......
Deleted, download 8.1 from App Store
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Deleted, download 8.1 from App Store