doInfinite(infiniteScroll) {console.log('Begin async operation');setTimeout(() => {  for (let i = 0; i < 5; i++) {    if(this.items.length < 20){      this.items.push( this.items.length );       infiniteScroll.complete();             }else{      infiniteScroll.enable(false);    }  }  console.log('Async operation has ended');}, 500);}ionViewDidLoad(){this.http.get('assets/data/nearby.json').subscribe(data=>{  console.log(data)  console.log(data.json())  this.lists = data.json()},error=>{  console.log(error)});}}