npm proxy setting

清理
npm config delete http-proxy
npm config delete https-proxy

具体设置步骤如下：
1. 执行

npm config

后， 将看到下一行提示信息

npm config ls -l

to show all defaults.

2.  执行

npm config ls -l

后，在一大长串的settign中找出userconfig项(大概位于倒数第4项)

[b]userconfig [/b]= "C:\\Users\\USER_NAME\\.npmrc"

3. 编辑"C:\\Users\\USER_NAME\\.npmrc",

proxy = http://username:[e-mail]:8080
https-proxy = http://username:[e-mail]:8080/

如无须username:password，  可略去，即如下

proxy = http://proxy.company.com:8080
https-proxy = http://proxy.company.com:8080

"保存"后即生效.

参见:
http://stackoverflow.com/questions/7559648/is-there-a-way-to-make-npm-install-the-command-to-work-behind-proxy
http://wil.boayue.com/blog/2013/06/14/using-npm-behind-a-proxy/