file upload in jquery

1$(function(){
2    $('#uploadBTN').on('click', function(){ 
3        var fd = new FormData($("#fileinfo"));
4        //fd.append("CustomField", "This is some extra data");
5        $.ajax({
6            url: 'upload.php',  
7            type: 'POST',
8            data: fd,
9            success:function(data){
10                $('#output').html(data);
11            },
12            cache: false,
13            contentType: false,
14            processData: false
15        });
16    });
17});
18