问题：Vue项目中安装插件，出现下面报错：

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR!
npm ERR! While resolving: less-loader@5.0.0
npm ERR! Found: less@4.1.2
npm ERR! node_modules/less
npm ERR!   dev less@"4.1.2" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer less@"^2.3.1 || ^3.0.0" from less-loader@5.0.0
npm ERR! node_modules/less-loader
npm ERR!   dev less-loader@"^5.0.0" from the root project
npm ERR!
npm ERR! Conflicting peer dependency: less@3.13.1
npm ERR! node_modules/less
npm ERR!   peer less@"^2.3.1 || ^3.0.0" from less-loader@5.0.0
npm ERR!   node_modules/less-loader
npm ERR!     dev less-loader@"^5.0.0" 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!
npm ERR! See D:\Professional Software\Node\NodeInsatll\node_cache\eresolve-report.txt for a full report.

解决方法：在安装的 命令后面加

--legacy-peer-deps

具体应用示例如下：

npm install echarts --save --legacy-peer-deps