报错：
[ng] This version of CLI is only compatible with Angular versions ^10.0.0-beta || >=10.0.0 <11.0.0,
[ng] but Angular version 8.1.3 was found instead.
[ng] Please visit the link below to find instructions on how to update Angular.
[ng] https://angular-update-guide.firebaseapp.com/
[ERROR] ng has unexpectedly closed (exit code 3).
解决办法：
首先ng -v查看一下angular-cli脚手架的版本
我的显示版本为10.1.6，其它的显示8.1.3，版本不兼容，需要安装一下对应的版本
具体步骤：
1.卸载当前的angular/cli
npm uninstall @angular/cli --save-dev
2.安装对应版本的angular/cli 在这里我需要安装8.1.3的
npm install @angular/cli@~8.1.3 --save-dev