<!DOCTYPE html>
<html>
<head>
<script src="/lib/jquery-1.12.2.min.js"></script>
<script>
$(document).ready(function(){
var lastms, d;
$("button").click(function(event){
if (lastms){
d = event.timeStamp - lastms
$("p").text("Milliseconds since last click event: " + d);
} else {
$("p").text("Click the button again.");
}
lastms = event.timeStamp;
});
});
</script>
</head>
<body>
<button>Click me</button>
<p></p>
</body>
</html>