jQuery addClass example
Change class name on click in jQuery
HTML
<div id="a1">
<div>
<i class='your-class'>1</i>
</div>
</div>
<div id="a2">
<div>
<i class='your-class'>2</i>
</div>
</div>
JavaScript
$(document).on('click', '#a1 .your-class', function(){
console.log($(this).text());
});