npm下载加速

   本人环境：

   windows10， vmware12， ubuntu环境下面：

    刚开始用npm下载失败,于是去网上找资料，说用阿里的地址进行下载可以，所以就用cnp加上设置registry = "https://registry.npm.taobao.org/"的方法去下载，但是下载到一半会卡住，报找不到github.XXX的地址（尝试了好多次，原来是我的虚拟机没法翻墙....）

   于是就开始进行设置代理（让我的虚拟机可以翻墙），以真机为服务器去翻墙（前提你的真机可以翻墙），然后又去尝试npm install XXXX

   这次报错误为：
    npm ERR! network tunneling socket could not be established, cause=socket hang up npm ERR! network This is most likely not a problem with npm itself npm ERR! network and is 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