npm install及npm install express-generator -g报错：errno -4048

错误: errno -4048

npm安装时没有权限操作nodejs文件夹（nodejs可能装到c盘了）
报错代码

npm ERR! path C:\Program Files\nodejs\node_modules\.staging
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall mkdir
npm ERR! Error: EPERM: operation not permitted, mkdir 'C:\Program Files\nodejs\node_modules\.staging'
npm ERR!  { Error: EPERM: operation not permitted, mkdir 'C:\Program Files\nodejs\node_modules\.staging'
npm ERR!   cause:
npm ERR!    { Error: EPERM: operation not permitted, mkdir 'C:\Program Files\nodejs\node_modules\.staging'
npm ERR!      errno: -4048,
npm ERR!      code: 'EPERM',
npm ERR!      syscall: 'mkdir',
npm ERR!      path: 'C:\\Program Files\\nodejs\\node_modules\\.staging' },
npm ERR!   stack: 'Error: EPERM: operation not permitted, mkdir \'C:\\Program Files\\nodejs\\node_modules\\.staging\'',
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: 'C:\\Program Files\\nodejs\\node_modules\\.staging' }
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 (though this is not recommended).

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2018-07-17T01_55_08_008Z-debug.log

解决

以管理员身份运行cmd，命令执行成功。

G:\web\nodejs\vue-express\nodejs>npm install express-generator -g
C:\Program Files\nodejs\express -> C:\Program Files\nodejs\node_modules\express-generator\bin\express-cli.js
+ express-generator@4.16.0
added 10 packages from 13 contributors in 2.15s