Dark Hole

function buyfunc(){

	var result = document.querySelector('.balance');
	var leftvalue = document.querySelector('.value');
	result.innerHTML = 125500;
	leftvalue.innerHTML = 0;
	document.getElementById('bttn').addEventListener('click', buy);
}

function buy(){

	var bleft = document.querySelector('.balance').innerHTML -= 1500;
		if(bleft <= 0){
			alert("Баланс достиг нуля!");
			document.querySelector('.balance').innerHTML = 0;
		}
			var leftvalue =document.querySelector('.value').innerHTML = parseInt(document.querySelector('.value').innerHTML) + 1;
}
buyfunc();

function hello(a){
a.stopPropagation();
//other code
};