MCMS前端问题的解决

 vue-router安装出现ERR! code ERESOLVE

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: vue_cli_app@0.1.0
npm ERR! Found: less@4.1.2
npm ERR! node_modules/less
npm ERR!   less@"^4.1.2" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! node_modules/less-loader
npm ERR!   less-loader@"^5.0.0" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See E:\nodeJs\NodeJs\node_cache\eresolve-report.txt for a full report.

错误原因：

	*npm版本过高*

出现以上错误的时候，和less-loader等安装失败的原因类似，都是由于npm版本过高导致的不兼容问题。

解决方法：

可安装低版本的npm，如：

npm install npm@6.14.10 -g

ERESOLVE unable to resolve dependency tree

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: ant-design-pro@4.1.0
npm ERR! Found: react@16.14.0
npm ERR! node_modules/react
npm ERR!   react@"^16.8.6" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"^15.0.0" from react-fittext@1.0.0
npm ERR! node_modules/react-fittext
npm ERR!   react-fittext@"^1.0.0" 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 C:\Users\issuser\AppData\Local\npm-cache\eresolve-report.txt for a full report.
 
npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\issuser\AppData\Local\npm-cache\_logs\2021-06-10T07_34_08_028Z-debug.log

错误原因

等依赖项中存在无法解决的冲突，npm@7 现在尝试安装它们，而npm@6没有。

解决方案

使用 npm i --legacy-peer-deps