npm安装node-sass等下载binary加速

国内安装npm包的时候，很多都需要从GitHub下载binary文件，即使你把npm的registry设置为国内的镜像，binary的url是程序设定的。不过目前最重要的几个包，都可以通过修改环境变量来让下载从国内的镜像下载，在.npmrc加入如下内容：

registry=https://registry.npm.taobao.org/
sass_binary_site=https://npm.taobao.org/mirrors/node-sass/
phantomjs_cdnurl=http://cnpmjs.org/downloads
electron_mirror=https://npm.taobao.org/mirrors/electron/
sqlite3_binary_host_mirror=https://foxgis.oss-cn-shanghai.aliyuncs.com/
profiler_binary_host_mirror=https://npm.taobao.org/mirrors/node-inspector/

这样，在npm install node-sass的时候，就会走国内的镜像下载binary。

registry=http://106.54.202.246:8081/repository/npm-group/
sass_binary_site="https://npm.taobao.org/mirrors/node-sass/"
phantomjs_cdnurl="http://cnpmjs.org/downloads"
electron_mirror="https://npm.taobao.org/mirrors/electron/"
sqlite3_binary_host_mirror="https://foxgis.oss-cn-shanghai.aliyuncs.com/"
profiler_binary_host_mirror="https://npm.taobao.org/mirrors/node-inspector/"
chromedriver_cdnurl="https://cdn.npm.taobao.org/dist/chromedriver"

.yarnrc

registry "http://106.54.202.246:8081/repository/npm-group/"
sass_binary_site "https://npm.taobao.org/mirrors/node-sass/"
phantomjs_cdnurl "http://cnpmjs.org/downloads"
electron_mirror "https://npm.taobao.org/mirrors/electron/"
sqlite3_binary_host_mirror "https://foxgis.oss-cn-shanghai.aliyuncs.com/"
profiler_binary_host_mirror "https://npm.taobao.org/mirrors/node-inspector/"
chromedriver_cdnurl "https://cdn.npm.taobao.org/dist/chromedriver"