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                <div id="spisofert"></div>




                /* OPIS
Konstruktor to specjalna funkcjia, która pozwala tworzyć 
obiekty wg. zdefiniowanego wzoru.
Dzięki temu możemy utworzyć wiele obiektów danej klasy
(korzystając z danego konstruktora).

const spisOfert=document.querySelector('#spisofert');
let pb95=4;

//początek konstruktora
function Oferta (marka, model, cena, spalanie, rocznik) {
            this.marka = marka;
            this.model = model;
            this.cena = cena;
            this.spalanie = spalanie;
            this.rocznik = rocznik;
            this.koszt100km = function() {
                let koszt = this.spalanie * pb95;
                return koszt;
            this.wiekSamochodu = function() {
                let data=new Date()
                let wiek=Number(data.getFullYear())-this.rocznik;
                if(wiek==1) { wiek=wiek+' rok'; }
                else if (wiek>1 && wiek <5) { wiek=wiek+' lata'; }
                else { wiek=wiek+' lat'; }
                return wiek;

//koniec konstruktora

//wywołanie konstruktora do utworzenia obiektu klasy Oferta
//o nazwie Oferta1
const Oferta1= new Oferta("Kia","Carens",60000,8,2016);

let listaOfert='';

listaOfert+='<b>'+Oferta1.marka+' '+Oferta1.model+'</b>';
listaOfert+='<br><b>'+Oferta1.cena+' zł</b>';
listaOfert+='<br> Koszt 100 km to: ' +Oferta1.koszt100km()+' zł ';
listaOfert+='<br> Wiek pojazdu: ' + Oferta1.wiekSamochodu();