Angular 5-如何在不刷新页面的情况下观察同级组件之间的数据更改？

import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';

@Injectable()
export class DataService {
  private dataSubject = new Subject<any>();

  getData() {
    return this.dataSubject.asObservable();
  }

  updateData(data: any) {
    this.dataSubject.next(data);
  }
}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-sender',
  template: `
    <button (click)="sendData()">发送数据</button>
  `
})
export class SenderComponent {
  constructor(private dataService: DataService) {}

  sendData() {
    const data = { message: 'Hello World' };
    this.dataService.updateData(data);
  }
}

import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-receiver',
  template: `
    <div>{{ receivedData | json }}</div>
  `
})
export class ReceiverComponent implements OnInit {
  receivedData: any;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.getData().subscribe(data => {
      this.receivedData = data;
    });
  }
}