问Blogs[]2-克隆BlogComponent的最好方法: Angular to Navmenu combobox？

EN

export enum BlogAction{
    CREATE,
    DELETE
}

export Blog{
    id: number;
    name: string;
}

export class BlogActionModel{
    action: BlogAction;
    blog: Blog;
}

@Injectable()
export class BlogService{

    private blogPoster: Subject<BlogActionModel> = new Subject<BlogActionModel>();
    public $blogPosted: Observable<BlogActionModel> = this.blogPoster.asObservable();

    create(blog: Blog): void{
        this.blogResource.saveToBackend(blog); //do save routine
        this.blogPoster.next({
            action: BlogAction.CREATE,
            blog: blog
        });
    }

    //implement `update` and `delete` actions in same way
}

@Component({})
export class NavMenuComponent implements OnInit{

    private blogs: Blog[] = [];

    constructor(private blogService: BlogService){}

    ngOnInit(): void{
        this.blogService.$blogPosted.subscribe((blogAction: BlogActionModel) => {
            if(blogAction.action === BlogAction.CREATE){
                this.blogs.push(blogAction.blog);
            }else if(blogAction.action === BlogAction.DELETE){
                //do delete
            }else{
                //do update
            }
        });
    }

}