介绍npm包有很多镜像源。有时需要切换npm源。nrm包解决了快速切换的问题。nrm可以帮助轻松快速地在不同的npm源地址之间切换。nrm内置了以下源：$nrmls*npm-----https://registry.npmjs.org/yarn-----https://registry.yarnpkg.comcnpm----http://r.cnpmjs.org/taobao--https://registry.npm.taobao.org/nj------https://registry.nodejitsu.com/skimdb--https://skimdb.npmjs.com/registryinstallnrm打开终端，运行npminstall-gnrm命令$npminstall-gnrm检查是否安装成功：nrm--version$nrm--versionusestolistoptionalsourcesnrmls$nrmls*npm-----https://registry.npmjs.org/yarn-----https://registry.yarnpkg.comcnpm----http://r.cnpmjs.org/taobao--https://registry.npm.taobao.org/nj------https://registry.nodejitsu.com/skimdb--https://skimdb.npmjs.com/registry前面带*的ofthem表示正在使用sourceswitchnrmusenpm//switchregistrytocnpm$nrmusecnpmRegistry已设置为：http://r.cnpmjs.org/添加sourcenrmadd
