ionic3 懒加载

 import { NgModule } from '@angular/core';
 import { IonicPageModule } from 'ionic-angular';
 import { SettingPage } from './setting';
 @NgModule({
  declarations: [
   SettingPage,
  ],
  imports: [
   IonicPageModule.forChild(SettingPage),
  ],
  entryComponents: [
   SettingPage,
  ]
 })
 export class SettingPageModule {}

 import { NgModule } from '@angular/core';
 import { IonicPageModule } from 'ionic-angular';
 import { SettingPage } from './setting';
 import {UserPasswordPageModule} from "./user-password/user-password.module";
 import {UsernamePageModule} from "./username/username.module";
 @NgModule({
  declarations: [
   SettingPage,
  ],
  imports: [
   IonicPageModule.forChild(SettingPage),
   //将两个子页面模块引入
   UserPasswordPageModule,
   UsernamePageModule,
  ],
  entryComponents: [
   SettingPage,
  ]
 })
 export class SettingPageModule {}