Angular-cli报错处理 You seem to not be depending on @angular/core. This is an error.

按照官网执行

npm install -g @angular/cli

ng new my-app

cd my-app

ng serve –open

执行到最后一步却报错

E:\learnProject\angularDemo\firstAngular\my-app>ng serve --o

You seem to not be depending on "@angular/core". This is an error.

百度无果 总感觉是依赖包没有安装成功

于是，执行了

E:\learnProject\angularDemo\firstAngular\my-app>cnpm install

再次执行 ng serve –o 成功打开网页