问题

在命令行使用npm install vuex --save的时候报错如下

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: first-app@1.0.0
npm ERR! Found: vue@2.6.14
npm ERR! node_modules/vue
npm ERR!   vue@"^2.5.2" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"^3.0.2" from vuex@4.0.2
npm ERR! node_modules/vuex
npm ERR!   vuex@"*" 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\admin\AppData\Local\npm-cache\eresolve-report.txt for a full repor
t.

出现这个问题是因为npm的版本太高导致的

解决办法

安装指定版本的vuex
查看vuex的可安装版本

C:\Users\admin>npm view vuex versions --json
[
  "0.1.0",
  "0.2.0",
  "0.3.0",
  "0.4.0",
  "0.4.1",
  "0.4.2",
  "0.5.0",
  "0.5.1",
  "0.6.1",
  "0.6.2",
  "0.6.3",
  "0.7.0",
  "0.7.1",
  "0.8.0",
  "0.8.1",
  "0.8.2",
  "1.0.0-rc",
  "1.0.0-rc.2",
  "1.0.0",
  "1.0.1",
  "2.0.0-rc.1",
  "2.0.0-rc.3",
  "2.0.0-rc.4",
  "2.0.0-rc.5",
  "2.0.0-rc.6",
  "2.0.0",
  "2.1.0",
  "2.1.1",
  "2.1.2",
  "2.1.3",
  "2.2.0",
  "2.2.1",
  "2.3.0",
  "2.3.1",
  "2.4.0",
  "2.4.1",
  "2.5.0",
  "3.0.0",
  "3.0.1",
  "3.1.0",
  "3.1.1",
  "3.1.2",
  "3.1.3",
  "3.2.0",
  "3.3.0",
  "3.4.0",
  "3.5.0",
  "3.5.1",
  "3.6.0",
  "3.6.1",
  "3.6.2",
  "4.0.0-alpha.1",
  "4.0.0-beta.1",
  "4.0.0-beta.2",
  "4.0.0-beta.3",
  "4.0.0-beta.4",
  "4.0.0-rc.1",
  "4.0.0-rc.2",
  "4.0.0",
  "4.0.1",
  "4.0.2"
]

安装指定版本的vuex

npm install vuex@3.6.2 --save

其他依赖安装报错解决方法类似