Ionic2如何下拉刷新和上拉加载

下拉刷新：

<ion-content>
  <ion-refresher (ionRefresh)="doRefresh($event)">
    <ion-refresher-content
      pullingIcon="arrow-dropdown"
      pullingText="Pull to refresh"
      refreshingSpinner="circles"
      refreshingText="Refreshing...">
    </ion-refresher-content>
  </ion-refresher>
</ion-content>

TypeScript：

@Component({...})
export class NewsFeedPage {
  items = [];
  doRefresh(refresher) {
    console.log('Begin async operation', refresher);

    setTimeout(() => {
      this.items = [];
      for (var i = 0; i < 30; i++) {
        this.items.push( this.items.length );
      }
      console.log('Async operation has ended');
      refresher.complete();
    }, 2000);
  }

}

上拉加载：

<ion-content>

 <ion-list>
   <ion-item *ngFor="let i of items">{{i}}</ion-item>
 </ion-list>

  <ion-infinite-scroll (ionInfinite)="doInfinite($event)">
    <ion-infinite-scroll-content
      loadingSpinner="bubbles"
      loadingText="Loading more data...">
    </ion-infinite-scroll-content>
  </ion-infinite-scroll>

</ion-content>

TypeScript：

@Component({...})
export class NewsFeedPage {
  items = [];

  constructor() {
    for (let i = 0; i < 30; i++) {
      this.items.push( this.items.length );
    }
  }

  doInfinite(infiniteScroll) {
    console.log('Begin async operation');

    setTimeout(() => {
      for (let i = 0; i < 30; i++) {
        this.items.push( this.items.length );
      }

      console.log('Async operation has ended');
      infiniteScroll.complete();
    }, 500);
  }

}