angular2 组件之间通过service互相传递的实例

@Injectable()export class ToolbarTitleService { title:string;}

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

export class RoleListComponent implements OnInit { constructor(private toolbarTitleService:ToolbarTitleService) {   console.log(this.toolbarTitleService.title);   } ngOnInit() { }}

import { Injectable } from '@angular/core';import { Subject } from 'rxjs/Subject';@Injectable()export class ToolbarTitleService { private titleSource = new Subject(); //获得一个Observable titleObservable =this.titleSource.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Subscription都会接受到结果 emitTitle(title: string) {  this.titleSource.next(title); }}

import { ToolbarTitleService } from './../../common/toolbar-title.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 toolbarTitleService:ToolbarTitleService) {   //调用方法，发射数据   this.toolbarTitleService.emitTitle('角色列表');   } ngOnInit() { }}

import { Component, OnInit } from '@angular/core';import { ToolbarTitleService } from "app/common/toolbar-title.service";import { Subscription } from "rxjs/Subscription";@Component({ selector: 'admin', templateUrl: './admin.component.html', styleUrls: ['./admin.component.scss'], providers: [ToolbarTitleService],})export class AdminComponent implements OnInit { title: string; subscription: Subscription; constructor(private toolbarTitleService: ToolbarTitleService) {  //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.subscription = this.toolbarTitleService.titleObservable.subscribe(src => console.log('得到的title:' + 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.subscription.unsubscribe(); }}