1、更换npm缓存位置
npm config set prefix "D:\Program Files\nodejsCache\node_global"
npm config set cache "D:\Program Files\nodejsCache\node_cache"

并在系统环境变量中添加 D:\Program Files\nodejsCache\node_global，否则全局安装组件无法使用。

2、安装淘宝cnpm
即将下线
npm install -g cnpm --registry=https://registry.npm.taobao.org
使用这条
npm install -g cnpm --registry=https://registry.npmmirror.com

3、设置npm源为淘宝源，加速下载
npm config set registry https://registry.npmmirror.com

4、执行npm i npm -g 全局更新npm

之后再去安装自己需要的组件

npm install vue-router
*npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: boss_demo@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@"^3.2.0" from vue-router@4.0.14
npm ERR! node_modules/vue-router
npm ERR! vue-router@"*" from the root project
npm ERR!
npm ERR! 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:\Program Files\nodejsCache\node_cache\eresolve-report.txt for a full report.
npm ERR! A complete log of this run can be found in:*

使用 npm install vue-router@3.2.0 -S 即可