This method is used to add the specified class in the particular element. In this example we add multiple class in the element (paragraph).
$("p").addClass("txtcolor txtxbackground");
Here txtcolor and txtxbackground are classes
Complete Program:
<!DOCTYPE html>
<html>
<head>
<style>
p { font-size:26px; }
.txtcolor { color:red; }
.txtxbackground { background:Pink; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<p>Mahak</p>
<script>
$("p").addClass("txtcolor txtxbackground");
</script>
</body>
</html>
OUTPUT