<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").on("click",function(){
var version = $().jquery;
alert("You are running jQuery version: " + version);
});
});
</script>
</head>
<body>
<button>Click me!</button>
</body>
</html>