1.原npm地址
    npm config set registry http://registry.npmjs.org
    2.设置国内镜像
    a.通过config命令
    npm config set registry https://registry.npm.taobao.org
    npm info underscore （如果上面配置正确这个命令会有字符串response）
    b.命令行指定
    npm —registry https://registry.npm.taobao.org info underscore
    c.编辑 ~/.npmrc 加入下面内容
    registry = https://registry.npm.taobao.org
    3.使用nrm管理registry地址
    a.下载nrm
    npm install -g nrm
    b.添加registry地址
    nrm add npm http://registry.npmjs.org
    nrm add taobao https://registry.npm.taobao.org
    c.切换npm registry地址
    nrm use taobao
    nrm use npm

    4.此命令可以后去当前使用源
    npm config get registry

    yarn install —ignore-engines —registry http://registry.npm.alibaba-inc.com

    yarn config get registry
    yarn config set registry —registry http://registry.npm.alibaba-inc.com

    npm install -g cnpm —registry=https://registry.npm.taobao.org

    只安装dependencies
    npm install —production —registry=https://registry.npm.taobao.org