当服务值更改Angular 8时更新组件值

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

@Injectable()
export class DataService {
  private dataSubject = new BehaviorSubject<string>('');

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

  updateData(newValue: string) {
    this.dataSubject.next(newValue);
  }
}

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

@Component({
  selector: 'app-example',
  template: `
    <h1>{{ value }}</h1>
  `,
})
export class ExampleComponent implements OnInit {
  value: string;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.getData().subscribe((newValue) => {
      this.value = newValue;
    });
  }
}

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

@Component({
  selector: 'app-another-example',
  template: `
    <button (click)="updateValue()">Update Value</button>
  `,
})
export class AnotherExampleComponent {
  constructor(private dataService: DataService) {}

  updateValue() {
    this.dataService.updateData('New Value');
  }
}