yarn global add yrs

 npm install -g yrs

yrs ls

name       registry                             home                             
npm        https://registry.npmjs.org           https://www.npmjs.org            
cnpm       http://r.cnpmjs.org                  http://cnpmjs.org                
taobao     https://registry.npm.taobao.org      https://npm.taobao.org           
nj         https://registry.nodejitsu.com       https://www.nodejitsu.com        
rednpm     http://registry.mirror.cqupt.edu.cn  http://npm.mirror.cqupt.edu.cn/  
npmMirror  https://skimdb.npmjs.com/registry    https://skimdb.npmjs.com/        
edunpm     http://registry.enpmjs.org           http://www.enpmjs.org 

yrs use taobao

yarn config v0.17.6
success Set "registry" to "https://registry.npm.taobao.org".
Done in 0.03s. 

  Usage: yrs [options] [command]


  Commands:

    current                          Show current registry name
    ls                               List all the registries
    use <registryName>               Change registry to registry
    add <registryName> <url> [home]  Add one custom registry
    del <registryName>               Delete one custom registry
    *                                Any

  Options:

    -h, --help     output usage information
    -V, --version  output the version number