angular4 共享服务在多个组件中数据通信的示例

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应用场景，不同组件中操作统一组数据，不论哪个组件对数据进行了操作，其他组件中立马看到效果。这样他们就要共用一个服务实例，是本次的重点，如果不同实例，那么操作的就不是同一组数据，那么就不会有这样的效果，想实现共用服务实例，就是在所有父组件中priviates:[]中引入这个组件，子组件中不需要再次引入，那么他们都是用的父组件中的服务实例。

1、公用服务

 import {Injectable} from "@angular/core"; @Injectable() export class CommonService { public dateList: any = [ { name: "张旭超", age: 20, address: "北京市朝阳区" } ]; constructor() { } addDateFun(data) { this.dateList.push(data); } }

2、parent.component.ts

 import {Component, OnInit} from "@angular/core"; import {CommonService} from "./common.service"; // 这里要通过父子公用服务来操作数据，只需要在父组件中引入服务。 @Component({ selector: "parent-tag", templateUrl: "parent.component.html", providers: [ CommonService ] }) export class ParentComponent implements OnInit { public list: any = []; constructor(private commonService: CommonService) { this.list = commonService.dateList; } ngOnInit() { } }

3、parent.component.html

    {{item.name}}  {{item.age}}  {{item.address}}

4、child-one.component.ts

 import {Component} from "@angular/core"; import {CommonService} from "./common.service"; @Component({ selector: "child-one-tag", templateUrl: "child-one.component.html" }) export class ChildOneComponent { public display: boolean = false; public username: string = ""; public age: number = 20; public address: string = ""; constructor(public commonService: CommonService) { } showDialog() { this.display = true; } hideDialog() { this.display = false; } addInfoFun() { let params = { name: this.username, age: this.age, address: this.address }; this.commonService.addDateFun(params); params = {}; } }

5、child-one.component.html