首先,通过以下命令检查已安装的angular/cli版本: ng --version 然后,在package.json文件中更新以下内容: "dependencies": { "@angular/common": "^7.2.0", "@angular/core": "^7.2.0", ... }, "devDependencies": { ... "@angular/cli": "^7.2.0" } 确保相应的angular和angular/cli版本匹配。如果版本不匹配,升级或降级angular和angular/cli的版本。最后,重新安装依赖项: npm install