Ok guys I know this question has been asked before but I am very new to PHP and JavaScript and hadn\'t even heard of ajax until i started looking for an answer to this question
Your code is not handling with that data. So instead, you should use following code :
$.get("backend.php", function(response) { alert(response); })
Or, to show that data on UI, assign it to any html element.
For more understanding , please visit :jQuery.get() link