angular2 组件之间通过service互相传递的实例

@Injectable()
export class Toolbar Service {
  :string;
}

@Component({
 selector: 'admin',
 templateUrl: './admin.component.html',
 styleUrls: ['./admin.component.scss'],
 providers: [Toolbar Service],
})

export class RoleListComponent implements OnInit {
 constructor(private toolbar Service:Toolbar Service) {
   console.log(this.toolbar Service. );
   }
 ngOnInit() { }
}

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

@Injectable()
export class Toolbar Service {
 private  Source = new Subject();
 //获得一个Observable
  Observable =this. Source.asObservable();
 constructor() { }
 //发射数据，当调用这个方法的时候，Subject就会发射这个数据，所有订阅了这个Subject的Sub ion都会接受到结果
 emit ( : string) {
  this. Source.next( );
 }
}

import { Toolbar Service } from './../../common/toolbar- .service';
import { Component, OnInit ,Output,EventEmitter} from '@angular/core';

@Component({
 selector: 'role-list',
 templateUrl: 'role-list.component.html',
 styleUrls: ['./role-list.component.css'],
 providers: [],
})

export class RoleListComponent implements OnInit {
 constructor(private toolbar Service:Toolbar Service) {
   //调用方法，发射数据
   this.toolbar Service.emit ('角色列表');
   }
 ngOnInit() { }
}

import { Component, OnInit } from '@angular/core';
import { Toolbar Service } from "app/common/toolbar- .service";
import { Sub ion } from "rxjs/Sub ion";

@Component({
 selector: 'admin',
 templateUrl: './admin.component.html',
 styleUrls: ['./admin.component.scss'],
 providers: [Toolbar Service],
})

export class AdminComponent implements OnInit {
  : string;
 sub ion: Sub ion;
 constructor(private toolbar Service: Toolbar Service) {
  //使用subscribe来订阅，当数据被发射出来的时候,这里就会接收到结果
  this.sub ion = this.toolbar Service. Observable.subscribe(src => console.log('得到的 :' + src));

 }

 ngOnInit() {

 }
 //销毁的时候需要取消订阅，因为订阅之后会一直处于观察者状态,不取消会导致泄露
 ngOnDestroy() {
  this.sub ion.unsubscribe();
 }
}