一 准备工作

首先，ionic3+Angular4的开发环境你得有，这里就不赘述。环境准备好，创建一个空白项目，模板自选。

二 实现过程

1 新建json文件和service

service记得在app.module.ts中引用

3 service

import {Injectable} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {Http, Response} from '@angular/http';
import "rxjs/add/operator/map";
@Injectable()
export class DemoService {
  constructor(private httpService: Http){
  // 网络接口请求
  getHomeInfo(): Observable<Response> {
    return this.httpService.request('http://jsonplaceholder.typicode.com/users')
  // 本地json文件请求
  getRequestContact(){
    return  this.httpService.get("assets/json/message.json")
4 数据显示
1 网络接口请求
//home.ts
import {ChangeDetectorRef, Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import {DemoService} from "../../services/demo.service";
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
export class HomePage {
  // 接收数据用
  listData: Object;
  // 依赖注入
  constructor(public navCtrl: NavController,
              private ref: ChangeDetectorRef,
              private demoService: DemoService,) {
  ionViewDidLoad() {
    // 网络请求
    this.getHomeInfo();
  getHomeInfo(){
    this.demoService.getHomeInfo()
      .subscribe(res => {
        this.listData = res.json();
        // 数据格式请看log
        console.log("listData------->",this.listData);
        this.ref.detectChanges();
      }, error => {
        console.log(error);
//home.html
<ion-header>
  <ion-navbar>
    <ion-title>首页</ion-title>
  </ion-navbar>
</ion-header>
<ion-content padding>
  <ion-list *ngFor="let item of listData">
    <ion-item>
    <!--?是Angular特定语法，相当于判断数据是否存在，有则显示无则不显示-->
      {{item?.name}}
    </ion-item>
  </ion-list>
</ion-content>
service中已经写了getRequestContact()方法对本地json文件读取。
//contact.ts
import {ChangeDetectorRef, Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import {DemoService} from "../../services/demo.service";
@Component({
  selector: 'page-contact',
  templateUrl: 'contact.html'
export class ContactPage {
  contactInfo=[];
  constructor(public navCtrl: NavController,
              private demoService: DemoService,
              private ref: ChangeDetectorRef,) {
  ionViewDidLoad() {
    // 网络请求
    this.getRequestContact();
  getRequestContact(){
    this.demoService.getRequestContact()
      .subscribe(res => {
        this.contactInfo = res.json();
        console.log("contactInfo------->",this.contactInfo);
        this.ref.detectChanges();
      }, error => {
        console.log(error);
// contact.html
<ion-header>
  <ion-navbar>
    <ion-title>
    </ion-title>
  </ion-navbar>
</ion-header>
<ion-content>
  <ion-list>
    <ion-item *ngFor="let item of contactInfo">
      <div style="display: flex;flex-direction: column;">
        <span>姓名:{{item?.name}}</span>
        <span>年龄:{{item?.age}}</span>
        <span>信息:{{item?.message}}</span>
    </ion-item>
  </ion-list>
</ion-content>
    function getMeetingDetailInfo($http,$scope) {
      console.log("请求json-------->");
      $http.get('file/meeting.json').success(function(data) {
        $scope.data = data;
        console.log("data----->",data);