我在npm install express时发生如下错误

npm ERR! Error: write EIO

npm ERR! at errnoException (net.js:901:11)

npm ERR! at Object.afterWrite (net.js:718:19)

npm ERR! If you need help, you may report this log at:

npm ERR! http://github.com/isaacs/npm/issues
npm ERR! or email it to:

npm ERR!
npm-@googlegroups.com

npm ERR! System Windows_NT 6.1.7601

npm ERR! command "F:\NodeJS\\node.exe" "F:\NodeJS\node_modules\npm\bin\n

pm-cli.js" "install" "express"

npm ERR! cwd C:\Users\lanling

npm ERR! node -v v0.10.17

npm ERR! npm -v 1.3.8

npm ERR! syscall write

npm ERR! code EIO

npm ERR! errno EIO

npm ERR!

npm ERR! Additional logging details can be found in:

npm ERR! C:\Users\dudu\npm-debug.log

npm ERR! not ok code 0

错误原因：win7下权限问题

解决办法：以管理员身份运行cmd,再执行命令