如何使用ngIf在Angular 7中的三个页面之间切换？

ng generate component Page1
ng generate component Page2
ng generate component Page3

<ng-container *ngIf="currentPage === 1">
  <app-page1></app-page1>
</ng-container>

<ng-container *ngIf="currentPage === 2">
  <app-page2></app-page2>
</ng-container>

<ng-container *ngIf="currentPage === 3">
  <app-page3></app-page3>
</ng-container>

export class ParentComponent {
  currentPage: number = 1;

  changePage(pageNumber: number) {
    this.currentPage = pageNumber;
  }
}

<button (click)="changePage(1)">Page 1</button>
<button (click)="changePage(2)">Page 2</button>
<button (click)="changePage(3)">Page 3</button>