无法安装 expo-cli -g

Question

我是 react-native 的新手，当我尝试启动 npm start 命令然后向我显示 'expo-cli' is not recognized as an internal or external command, 这个错误时，我正在尝试在所有软件包安装后设置我的项目。

好的，那我已经按照here的指南进行操作了

之后我以这种方式添加了我的env path：

environment variable >  System Variables > PATH >
C:\Users\YOUR_USERNAME\AppData\Roaming\npm

那我必须重新安装：

npm install -g expo-cli

但它对我不起作用，我不知道为什么。

当我尝试运行此命令 npm install -g expo-cli 时，显示如下错误：

PS C:\Users\alami\OneDrive\Desktop\React native\starter-react-native> npm install -g expo-cli
npm ERR! code EPERM
npm ERR! syscall mkdir
npm ERR! path C:\Program Files\nodejs\node_modules\expo-cli
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, mkdir 'C:\Program Files\nodejs\node_modules\expo-cli'     
npm ERR!  [Error: EPERM: operation not permitted, mkdir 'C:\Program Files\nodejs\node_modules\expo-cli'] {
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: 'C:\\Program Files\\nodejs\\node_modules\\expo-cli'
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the      
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\alami\AppData\Local\npm-cache\_logs\2021-05-21T00_58_34_585Z-debug.log

Answer 1

至少我只是这样解决了我的问题：

1. 搜索cmd
2. 然后以管理员身份运行
3. 然后npm i -g expo-cli

我刚刚解决了我的问题。