报错内容：
Install fail! TypeError: Cannot convert undefined or null to object
npminstall version: 3.28.1
npminstall args: C:\Program Files\nodejs\node.exe C:\Users\user\AppData\Roaming\nvm\v12.4.0\node_modules\cnpm\node_modules\npminstall\bin\install.js --fix-bug-versions --china --userconfig=**C:\Users\user\.cnpmrc** --disturl=https://npm.taobao.org/mirrors/node --registry=https://registry.npmmirror.com
npm最新淘宝镜像站
解决方法：
1、查看如下两个文件
C:\Users\user.cnpmrc
C:\Users\user.npmrc
registry=https://registry.npmmirror.com
sass_binary_site=https://registry.npmmirror.com/node-sass/
strict-ssl=false
2、查看项目中的.npmrc
registry=https://registry.npmmirror.com
sass_binary_site=https://registry.npmmirror.com/node-sass/
phantomjs_cdnurl=http://cnpmjs.org/downloads
之后能不报安装的错了，但又报scss的错
查看package.json，并改
"node-sass": "4.12.0",
"sass-loader": "8.0.0",
项目中用的node是12.4.0,cnpm是6.1.1
