Vardges,
<div class="element">
asd
</div><div class="element">
asd
</div>
<script>
var elems=document.querySelectorAll('.element');//.element класс div-а
for(var i=0; i < elems.length; i++){
elems[i].addEventListener('click',function(){
this.innerHTML=(Math.random()*9).toFixed();
});
};
</script>