设置npm下载源，加快组件下载

1.设置淘宝镜像，永久修改本地npm的源

npm config set registry https://registry.npm.taobao.org

2.临时设置本地npm的源

npm --registry https://registry.npm.taobao.org install express

3.查看当前下载源

npm config get registry

4.npm下载配置

npm install -g @vue/cli --registry=https://registry.npm.taobao.org

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