Unexpected value ‘AnyComponent’ declared by the module ‘AppModule’…

此报错的原因:
因为装饰器@component需要紧挨着要导出的组件,没有这个修饰符,你的组件并不是一个真正的组件,只是一个类。

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@Component({
selector: 'app-hero-app',
templateUrl: './hero-app.component.html',
styleUrls: ['./hero-app.component.scss']
}) //这里必须紧挨着,不能换行,这样的装饰器紧接着的类才是一个组件
export class HeroAppComponent implements OnInit {
title = 'Tour of Heroes';
heroes = HEROES;
selectedHero: Hero;
constructor() { }

ngOnInit() {
}
onSelect(hero: Hero): void {
this.selectedHero = hero;
}

}

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@Component({
selector: 'app-hero-app',
templateUrl: './hero-app.component.html',
styleUrls: ['./hero-app.component.scss']
}) //下边有了一个换行,这样就会报错


export class HeroAppComponent implements OnInit {
title = 'Tour of Heroes';
heroes = HEROES;
selectedHero: Hero;
constructor() { }

ngOnInit() {
}
onSelect(hero: Hero): void {
this.selectedHero = hero;
}

}