项目场景：
npm install 运行vue项目时候
问题描述
项目场景：sass-loader ，node-sass出错
! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: smoore-mes-web@1.4.0
npm ERR! Found: webpack@3.12.0
npm ERR! node_modules/webpack
npm ERR! dev webpack@"^3.6.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer webpack@"^4.36.0 || ^5.0.0" from sass-loader@10.3.1
npm ERR! node_modules/sass-loader
npm ERR! dev sass-loader@"^10.0.1" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
原因分析：
这个是node-sass和sass-loader版本不对应造成
解决方案：
npm install node-sass@7.0.1 --save-dev
npm install sass-loader@7.3.1 --save-dev
npm install
npm run dev
