[HTML] pobierz, plaintext 
<script type="text/javascript">
function load() { 
var el = document.getElementById("button");
el.addEventListener('click', function(e) {
	var classes = document.querySelector('.div1');
	classes.classList.add('newclass');
});
}
</script>
 
 
<div id="button">
button
</div>
 
<div class="div1">
content
</div>
[HTML] pobierz, plaintext