How to use angular4 to communicate data among multiple components

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); } }

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() { } }

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

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 = {}; } }

 
 
姓名：
 
年龄：
 
地址：