<!DOCTYPE html>
<html>
<head>
<script src="/lib/jquery-1.12.2.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$.ajax({url: "demo_ajax_script.js", dataType: "script"});
});
});
</script>
</head>
<body>
<button>Use Ajax to get and then run a JavaScript</button>
</body>
</html>