Angular发送广播和接收广播

home.module.ts

import {BroadcastService} from "../broadcast.service";

@NgModule({
    imports: [
    ],
    declarations: [
    ],
    entryComponents: [
    ],
    providers: [BroadcastService],//全局提供BroadcastService
    schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
export class GatewayPortalHomeModule {
}
/*发送广播Service*/
BroadcastService.component.ts

import {Injectable, EventEmitter} from "@angular/core";
@Injectable()
export class BroadcastService {

    constructor() {}

    eventbus: EventEmitter<any> = new EventEmitter<any>();
}
/*发送广播组件*/

broadcast.component.ts

import {BroadcastService} from "../broadcast.service";

@Component({
    selector: 'jhi-broadcast',
    templateUrl: './broadcast.component.html',
    styleUrls: ['./broadcast.component.css'],
    providers: [],
})
export class BroadcastComponent implements OnInit {

  constructor(public broadcastService: BroadcastService){}//BroadcastService只注入不提供(providers)

  ngOnInit() {}

  send(){//发送广播事件

     this.broadcastService.eventbus.emit({msg: 'reload'})//发送广播

}
/*接收广播组件*/
receive.component.ts

import {BroadcastService} from "../broadcast.service";

@Component({
    selector: 'jhi-receive',
    templateUrl: './receive.component.html',
    styleUrls: ['./receive.component.css'],
    providers: [],
})
export class ReceiveComponent implements OnInit,OnDestroy {

  testSub: any;

  constructor(public broadcastService: BroadcastService){//BroadcastService只注入不提供(providers)

      this.testSub = this.broadcastService.eventbus.subscribe((event) => {//接收广播-----最好放在构造方法里

           if(event.msg=="reload"){
                //接收广播后做代码逻辑处理
             }
      });

  }

  ngOnInit() {

  }

  ngOnDestroy() {
      this.testSub.unsubscribe();//取消订阅
  }

}