问为什么在安装yeoman时，NodeJs和npm总是出现错误？

EN

`Welcome to Git (version 1.9.4-preview20140815)


Run 'git help git' to display the help index.
Run 'git help <command>' to display help for specific commands.

Jeff@JEFF-PC ~
$ node --version
v0.10.32

Jeff@JEFF-PC ~
$ npm --version
1.4.28

Jeff@JEFF-PC ~
$ npm install --global yo
c:\UsersJeffnpm\yo -> c:\UsersJeffnpm\node_modules\yo\cli.js

> yo@1.2.1 postinstall c:\UsersJeffnpm\node_modules\yo
> node ./scripts/doctor

[Yeoman Doctor] Uh oh, I found potential errors on your machine
---------------

[Error] npm root value is not in your NODE_PATH
  [info]
    NODE_PATH = :\Users\Jeff\npm\node_modules:\home\npm\lib\node_modules
    npm root  = c:\UsersJeffnpm\node_modules

  [Fix] Append the npm root value to your NODE_PATH variable
    If you're using cmd.exe, run this command to fix the issue:
      setx NODE_PATH "%NODE_PATH%;c:\UsersJeffnpm\node_modules"
    Then restart your command line. Otherwise, you can setup NODE_PATH manually:

      https://github.com/sindresorhus/guides/blob/master/set-environment-variabl
es.md#windows

 export PATH=$PATH:/usr/local/bin
 export NODE_PATH=:/Users/Jeff/npm/node_modules
 export NODE_PATH=:/Users/Jeff/npm/node_modules:/home//npm/lib/node_modules