如何使ion-tab对子页面可见？

npm install -g @ionic/cli

ionic start myApp blank

cd myApp

<ion-tabs>
  <ion-tab-bar slot="bottom">
    <ion-tab-button tab="tab1">
      <ion-icon name="home"></ion-icon>
      <ion-label>Home</ion-label>
    </ion-tab-button>

    <ion-tab-button tab="tab2">
      <ion-icon name="person"></ion-icon>
      <ion-label>About</ion-label>
    </ion-tab-button>
  </ion-tab-bar>
</ion-tabs>

import { NgModule } from '@angular/core';
import { PreloadAllModules, RouterModule, Routes } from '@angular/router';

const routes: Routes = [
  {
    path: '',
    redirectTo: 'tabs/tab1',
    pathMatch: 'full'
  },
  {
    path: 'tabs',
    loadChildren: () => import('./tabs/tabs.module').then(m => m.TabsPageModule)
  }
];

@NgModule({
  imports: [
    RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { Tab1Page } from './tab1/tab1.page';
import { Tab2Page } from './tab2/tab2.page';

const routes: Routes = [
  {
    path: '',
    redirectTo: 'tab1',
    pathMatch: 'full'
  },
  {
    path: 'tab1',
    component: Tab1Page
  },
  {
    path: 'tab2',
    component: Tab2Page
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class TabsPageRoutingModule { }