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//注意-g必不可少 不然那不起作用
yarn config set registry https://registry.npm.taobao.org -g
//node-sass建议也配置下 不然会去gitHub下载
yarn config set sass_binary_site http://cdn.npm.taobao.org/dist/node-sass -g
npm config set PHANTOMJS_CDNURL http://npm.taobao.org/mirrors/phantomjs -g 
npm config set CHROMEDRIVER_CDNURL http://npm.taobao.org/mirrors/chromedriver -g