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nodejs是运行在服务器端的javascript 单线程队列 异步回调
设置淘宝镜像
npm config set registry https://registry.npm.taobao.org
配置后可通过下面方式来验证是否成功
npm config set registry https://registry.npmjs.org
还原
npm config set registry https://registry.npmjs.org
node-sass改镜像源
npm set sass_binary_site=https://npm.taobao.org/mirrors/node-sass/