准备工作：

1. 下载nodejs （exe format）(http://nodejs.org/)
2. 下载npm（zip format）(http://nodejs.org/dist/npm/)

开始安装

1. Make a clean directory (for example "D:\Program Files\nodejs") and add that directory to your system‘s PATH variable
2. Put the downloaded node.exe file to the directory you made
3. Unpack the downloaded npm-xxx file to the same directory
4. Open cmd command window in the directory  of  "D:\Program Files\nodejs", execute npm install express -g
5. Done.

Windows 7 搭建 nodejs、npm、express 环境