npm 解决无法install的问题（设置代理）

在公司的网络中npm一直install不了

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C:\Users\heroyan>npm install less  
npm http GET https://registry.npmjs.org/less  
npm http GET https://registry.npmjs.org/less  
npm http GET https://registry.npmjs.org/less  
npm ERR! Error: connect ETIMEDOUT  
npm ERR!     at errnoException (net.js:768:11)  
npm ERR!     at Object.afterConnect [as oncomplete] (net.js:759:19)  
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 "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Fi  
ejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "less"  
npm ERR! cwd C:\Users\heroyan  
npm ERR! node -v v0.8.8  
npm ERR! npm -v 1.1.59  
npm ERR! syscall connect  
npm ERR! code ETIMEDOUT  
npm ERR! errno ETIMEDOUT  
npm ERR!  
npm ERR! Additional logging details can be found in:  
npm ERR!     C:\Users\heroyan\npm-debug.log  
npm ERR! not ok code 0  

原来是代理的问题，电脑通过代理上网，所以设置下代理就可以了，运行命令
npm set proxy=http://proxy-szn