npm install 报错 npm ERR! code ERESOLVE npm ERR! ERESOLVE unable to resolve dependency tree问题解决问题报错npm版本查阅资料后说是因为npm7.x的版本比npm6.x更严格两种解决方案1.降级到npm6.x2.npm i--legacy-peer-deps方案二亲测可用