今天很是郁闷了一天，本来想好好再学习一下nodejs,使用npm 命令安装常用的nodejs web框架模块express:谁知道只在cmd命令窗口写了一句话，npm install express,结果报错，win10环境：
Microsoft Windows [版本10.0.10586]
(c) 2015 Microsoft Corporation。保留所有权利。
C:\Users\ERP-PROGRAMMER>cd C:\Program Files\nodejs
C:\Program Files\nodejs>npm install express
npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "express"
npm ERR! node v4.4.6
npm ERR! npm v2.15.5
npm ERR! path C:\Program Files\nodejs\cache\express\4.14.0\package.tgz.3694580375
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall open
npm ERR! Error: EPERM: operation not permitted, open 'C:\Program Files\nodejs\cache\express\4.14.0\package.tgz.3694580375'
npm ERR! at Error (native)
npm ERR! { [Error: EPERM: operation not permitted, open 'C:\Program Files\nodejs\cache\express\4.14.0\package.tgz.3694580375']
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'open',
npm ERR! path: 'C:\\Program Files\\nodejs\\cache\\express\\4.14.0\\package.tgz.3694580375' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "express"
npm ERR! node v4.4.6
npm ERR! npm v2.15.5
npm ERR! path C:\Program Files\nodejs\npm-debug.log.2161696231
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall open
npm ERR! Error: EPERM: operation not permitted, open 'C:\Program Files\nodejs\npm-debug.log.2161696231'
npm ERR! at Error (native)
npm ERR! { [Error: EPERM: operation not permitted, open 'C:\Program Files\nodejs\npm-debug.log.2161696231']
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'open',
npm ERR! path: 'C:\\Program Files\\nodejs\\npm-debug.log.2161696231' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR! C:\Program Files\nodejs\npm-debug.log
C:\Program Files\nodejs>npm -v
2.15.5
好吧，找度娘！结果各种不靠谱，最后花费了一天的时间找到了！需用系统管理员的权限打开cmd窗口，
引用：http://www.zhihu.com/question/35511902
非常感谢