因为 yarn地址问题导致下载过慢

YRM 换源

一个 yarn源管理器，允许你快速地在yarn源间切换

// 安装 yrm
npm install -g yrm

// 列出可选的源
yrm ls
  npm ---- https://registry.npmjs.org/
  cnpm --- http://r.cnpmjs.org/
* taobao - https://registry.npm.taobao.org/
  nj ----- https://registry.nodejitsu.com/
  rednpm - http://registry.mirror.cqupt.edu.cn/
  npmMirror  https://skimdb.npmjs.com/registry/
  edunpm - http://registry.enpmjs.org/
  yarn --- https://registry.yarnpkg.com

// 测试每个源响应时间
yrm test
  npm ---- 901ms
  cnpm --- 1160ms
* taobao - 488ms
  nj ----- Fetch Error
  rednpm - 335ms
  npmMirror  3440ms
  edunpm - Fetch Error
  yarn --- Fetch Error

// 使用淘宝源
yrm use taobao