使用Angular中的主题通过服务将数据发送到组件

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

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private dataSubject = new Subject<any>();

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

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

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

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

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

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

@Component({
  selector: 'app-component-b',
  template: `
    <div>{{ receivedData }}</div>
  `
})
export class ComponentB implements OnInit {
  receivedData: any;

  constructor(private dataService: DataService) {}

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