Hi, Anyone knows how to use this chartjs ?...I am confuse on this on how am i going to load datasets via jquery.ajax

I want to replace this part
data : [65,59,90,81,56,55,40]
And this
data : [28,48,40,19,96,27,100]
to the data that i requested via ajax.but i am confuse on how to do this or to achieve this.

if i have this ajax returned with json encoded

Code:
   $(function(){
    $.ajax({
      type: 'post',
      url: 'requestingdata.php',
      success: function(data){
           //How do i load now this returned data to the datasets "data:" ?
    }
  });
});

HTML Code:
<!doctype html>
<html>
	<head>
		<title>Bar Chart</title>
		<script src="Chart.js"></script>
		<meta name = "viewport" content = "initial-scale = 1, user-scalable = no">
		<style>
			canvas{
			}
		</style>
	</head>
	<body>
		<canvas id="canvas" height="450" width="600"></canvas>


	<script>

		var barChartData = {
			labels : ["January","February","March","April","May","June","July"],
			datasets : [
				{
					fillColor : "rgba(220,220,220,0.5)",
					strokeColor : "rgba(220,220,220,1)",
					data : [65,59,90,81,56,55,40]
				},
				{
					fillColor : "rgba(151,187,205,0.5)",
					strokeColor : "rgba(151,187,205,1)",
					data : [28,48,40,19,96,27,100]
				}
			]
			
		}

	var myLine = new Chart(document.getElementById("canvas").getContext("2d")).Bar(barChartData);
	
	</script>
	</body>
</html>
please help me on this

Thank you in advance.