npm安装依赖报错 npm code ERESOLVEnpm ERESOLVE unable to resolve dependency tree

在安装npm i vue-router （路由）时出现了这个错误。

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: vue_test@0.1.0
npm ERR! Found: vue@2.6.14
npm ERR! node_modules/vue
npm ERR!   vue@"^2.6.14" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"^3.2.0" from vue-router@4.0.14
npm ERR! node_modules/vue-router
npm ERR!   vue-router@"*" from the root project
npm ERR!
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ER