Javascript/class

var i = 0;
class Wood {
    constructor(type, totalPrice){
        this.type = type;
        this.price = totalPrice;
        i++;
    }
    console(){
        console.log(this.type);
        console.log(this.price);
        console.log(i);
    }
}

var btn = document.getElementById("btn");
btn.addEventListener("click", function(){
    var w = new Wood("aaa", 100);
    w.console();
});

var btn02 = document.getElementById("btn02");
btn02.addEventListener("click", function(){
    var s = new Wood("bbb", 300);
    s.console();
});