如何将离子幻灯片设置为首次用户只查看一次？

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
    <ion-slides pager="true">
      <ion-slide>
        <h1>Welcome to the App</h1>
        <p>This is the first slide.</p>
      </ion-slide>
      <ion-slide>
        <h1>Slide 2</h1>
        <p>This is the second slide.</p>
      </ion-slide>
      <ion-slide>
        <h1>Slide 3</h1>
        <p>This is the third slide.</p>
      </ion-slide>
    </ion-slides>
  `,
})
export class AppComponent {
  constructor() {
    const isSlideshowShown = localStorage.getItem('slideshowShown');

    if (isSlideshowShown === null) {
      localStorage.setItem('slideshowShown', 'true');
    }
  }
}