报错：
npm ERR! code EPERM
npm ERR! syscall mkdir
npm ERR! path D:\node.js\node_global
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, mkdir ‘D:\node.js\node_global’
npm ERR! [Error: EPERM: operation not permitted, mkdir ‘D:\node.js\node_global’] {undefined
npm ERR! errno: -4048,
npm ERR! code: ‘EPERM’,
npm ERR! syscall: ‘mkdir’,
npm ERR! path: ‘D:\node.js\node_global’
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
解决方法：
找到C盘下用户目录下的账户目录下的.npmrc文件,如果找不到试着打开隐藏的文件夹
删除以后重新安装成功
