ionic 上拉加载更多

<!--上拉更多 ng-if="moreDataCanBeLoaded()"-->
<ion-infinite-scroll (ionInfinite)="doInfinite($event)" distance="1%" >
  <ion-infinite-scroll-content></ion-infinite-scroll-content>
</ion-infinite-scroll>

  
//上拉 加载更多
  async doInfinite(infiniteScroll) {
    if (this.isLock) return ;
    this.isLock = true;

    console.log('Begin async operation');
    this.CURRENT_PAGENO = this.CURRENT_PAGENO + 1 ;


    /* http请求 */
    let timer:any;
    try {

      let result = await this.SNAP_GET_SECURITY_LOG_BY_CONDITION(true);

      if(result){
        clearTimeout(timer);
        infiniteScroll.complete();
        // this.ionViewWillEnter();
      }else {
        timer = setTimeout(()=>{
          clearTimeout(timer);
          infiniteScroll.complete();
        },4000)
      }
      this.isLock = false;

    } catch (e) {
      clearTimeout(timer);
      infiniteScroll.complete();
      this.isLock = false;
    }

  }