如何在angular2中触发从一个组件到另一个组件的功能？

import { Subject } from 'rxjs/Subject';

class Someservice {
  private _subject = new Subject<any>();

  newEvent(event) {
    this._subject.next(event);
  }

  get events$() {
    return this._subject.asObservable();
  }
}

您的组件可以发布,也可以订阅

@NgModul({
  providers: [ Someservice ]
})
class AppModule {}

@Component()
class ComponentOne {
  constructor(private service: SomeservicE) {}

  onClick() {
    service.newEvent('clicked!');
  }
}

@Component()
class ComponentTwo {
  constructor(private service: SomeservicE) {}

  ngOnInit() {
    this.service.events$.forEach(event => console.log(event));
  }
}

也可以看看：

> Getting Started on Subjects