错误：

npm install --save @riophae/vue-treeselect
npm ERR! code ERR_TLS_CERT_ALTNAME_INVALID
npm ERR! errno ERR_TLS_CERT_ALTNAME_INVALID
npm ERR! request to https://registry.cnpmjs.org/@riophae%2fvue-treeselect failed, reason: Hostname/IP does not match certificate's altnames: Host: registry.cnpmjs.org. is not in the cert's altnames: DNS:r.cnpmjs.org

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\admin\AppData\Roaming\npm-cache\_logs\2020-06-20T00_52_30_293Z-debug.log

解决：

依次执行：1，2，3

1.npm config set strict-ssl false  

2.npm install -g supervisor

3.npm install --global vue-cli

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