npm err安装报错解决办法

npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! network request to https://registry.npmjs.org/hexo-deployer-git failed, reason: connect ETIMEDOUT 211.136.113.1:8080
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

在执行npm install时出现以上错误，尝试了很多种方法，都没有解决，最后使用http://stackoverflow.com/questions/20397883/npm-doesnt-install-any-modules-network-socket-hangs-up 中的方法，成功解决问题。

解决办法：

1. 先清除掉以前的代理设置

npm config set proxy null
npm config set https-proxy null

也可以先通过以下代码查看代理设置，如果返回null那就不需要清理。

npm config get proxy
npm config get https-proxy

2. 重新设置

npm config registry http://registry.cnpmjs.org/