[Lemme]

<div>
    <button id="prev"><</button>
    <span>3</span>
    <button id="next">></button>
</div>

<script>
	document.querySelector('div').onclick = function(event) {
		var maxValue = 5;
	    if (event.target.id === 'prev') {
	        var counter = event.target.nextElementSibling;
	    	if (+counter.innerHTML > 0) {
	        	counter.innerHTML--;
	        }
	    }
	    if (event.target.id === 'next') {
	        var counter = event.target.previousElementSibling;
	    	if (+counter.innerHTML < maxValue) {
	        	counter.innerHTML++;
	        }
	    }
	}
</script>