Angular4 组件通讯方法大全(推荐)(2)

import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number=0; constructor(service:myService) { setInterval(()=> { service.i++; }, 1000) } }

parent.html

<ion-header> <ion-navbar> <ion-title>Parent</ion-title> </ion-navbar> </ion-header> <ion-content padding> <h1>parent {{i}}</h1> <page-child></page-child> </ion-content>

child.ts

import { Component} from '@angular/core'; import{myService}from "../child/myService" @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { constructor(public service:myService){ } }

child.html

<ion-content padding> <h2>child {{service.i}}</h2> </ion-content>

myService.ts

ps:记得在app.module.ts 加上providers: [KmyService]

import{Injectable } from '@angular/core'; @Injectable() export class KmyService { i:number = 0; }

结果：

6.EventEmitter

myService.ts

import {Component,Injectable,EventEmitter} from '@angular/core'; @Injectable() export class myService { change: EventEmitter<number>; constructor(){ this.change = new EventEmitter(); } }

parent.ts

import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number = 0; constructor(service:myService) { setInterval(()=> { service.change.emit(++this.i); }, 1000) } }

parent.html

<ion-header> <ion-navbar> <ion-title>Parent</ion-title> </ion-navbar> </ion-header> <ion-content padding> <h1>parent {{i}}</h1> <page-child></page-child> </ion-content>

child.ts

import { Component, EventEmitter} from '@angular/core'; import{myService}from "../child/myService" @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { i:number = 0; constructor(public service:myService){ service.change.subscribe((value:number)=>{ this.i = value; }) } }

child.html

<ion-content padding> <h2>child {{i}}</h2> </ion-content>

结果：

7.订阅

parent.ts

import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number=0; constructor(public service:myService) { setInterval(()=> { this.service.StatusMission(this.i++); }, 1000) } }

parent.html

<ion-header> <ion-navbar> <ion-title>Parent</ion-title> </ion-navbar> </ion-header> <ion-content padding> <h1>parent</h1> <page-child></page-child> </ion-content>

child.ts

import { Component, Injectable } from '@angular/core' import { myService } from "../child/myService" import { Subscription } from 'rxjs/Subscription'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { i:number=0; subscription: Subscription; constructor(private Service: myService) { this.subscription = Service.Status$.subscribe(message => { this.i=message; }); } ngOnDestroy() { this.subscription.unsubscribe(); } }

child.html

<ion-content padding> <h2>child {{i}}</h2> </ion-content>

myService.ts

import { Injectable } from '@angular/core'; import { Subject } from 'rxjs/Subject'; @Injectable() export class myService { private Source=new Subject<any>(); Status$=this.Source.asObservable(); StatusMission(message: any) { this.Source.next(message); } }

结果：

以上七种组件与组件的通讯方式，可以选择应用于适合的场景里面，根据情况吧。希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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