natmegs/app.component.ts

## app.component.ts
@ViewChild(HelloComponent) hello: HelloComponent;
@ViewChildren(HelloComponent) hellos: QueryList<HelloComponent>;

ngAfterViewInit() {
 console.log(this.hello);
 console.log(this.hellos);
}
	@ViewChild(HelloComponent) hello: HelloComponent;
	@ViewChildren(HelloComponent) hellos: QueryList<HelloComponent>;

	ngAfterViewInit() {
	console.log(this.hello);
	console.log(this.hellos);
	}