npm ERR! code EPERM npm ERR! syscall open npm ERR! path E:\nodejs\node_cache\_cacache\tmp\cccb17dc n

使用npm命令npm install express -g安装出错，报错信息如下：

npm ERR! code EPERM
npm ERR! syscall open
npm ERR! path E:\nodejs\node_cache\_cacache\tmp\cccb17dc
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, open 'E:\nodejs\node_cache\_cacache\tmp\cccb17dc'
npm ERR!  [OperationalError: EPERM: operation not permitted, open 'E:\nodejs\node_cache\_cacache\tmp\cccb17dc'] {
npm ERR!   cause: [Error: EPERM: operation not permitted, open 'E:\nodejs\node_cache\_cacache\tmp\cccb17dc'] {
npm ERR!     errno: -4048,
npm ERR!     code: 'EPERM',
npm ERR!     syscall: 'open',
npm ERR!     path: 'E:\\nodejs\\node_cache\\_cacache\\tmp\\cccb17dc'
npm ERR!   },
npm ERR!   isOperational: true,
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'open',
npm ERR!   path: 'E:\\nodejs\\node_cache\\_cacache\\tmp\\cccb17dc'
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.

解决方法，使用管理员身份打开cmd并安装，成功！