我们首先在为创建两个文件夹设置路径

npm config set prefix="D:\Environment\nodejsRepository\node_global"
npm config set cache="D:\Environment\nodejsRepository\node_cache"

 然后设置淘宝镜像

npm config set registry https://registry.npm.taobao.org

 这样会创建一个注册表在c盘用户目录中（这是我的C:\Users\love13）

 接着便是安装淘宝镜像 npm install -g cnpm

接着出现这个问题：

npm ERR! code EPERM
npm ERR! syscall mkdir
npm ERR! path D:\Program Files\nodejs\node_cache\_cacache
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, mkdir 'D:\Program Files\nodejs\node_cache\_cacache'
npm ERR!  [OperationalError: EPERM: operation not permitted, mkdir 'D:\Program Files\nodejs\node_cache\_cacache'] {
npm ERR!   cause: [Error: EPERM: operation not permitted, mkdir 'D:\Program Files\nodejs\node_cache\_cacache'] {
npm ERR!     errno: -4048,
npm ERR!     code: 'EPERM',
npm ERR!     syscall: 'mkdir',
npm ERR!     path: 'D:\\Program Files\\nodejs\\node_cache\\_cacache'
npm ERR!   },
npm ERR!   isOperational: true,
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: 'D:\\Program Files\\nodejs\\node_cache\\_cacache'
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.

 有的解决方案是删除注册表，可是千万别删！千万别删！千万别删！

这时候关闭命令提示符，然后重新使用管理员权限进入安装即可