Could not find module “@angular-devkit/build-angular”

问题：启动项目报错

卸载个人@ angular / cli，而后删除node_modules目录和package-lock.json文件，而后从新安装@ angular / cli

npm uninstall @angular/cli@7.1.3 #rm -rf node_modules #rm package-lock.json #npm install @angular/cli@7.1.3