progressbar jquery 3 ajax

1$.ajax({
2    xhr: function() {
3        var xhr = new window.XMLHttpRequest();
4
5        // Upload progress
6        xhr.upload.addEventListener("progress", function(evt){
7            if (evt.lengthComputable) {
8                var percentComplete = evt.loaded / evt.total;
9                //Do something with upload progress
10                console.log(percentComplete);
11            }
12       }, false);
13
14       // Download progress
15       xhr.addEventListener("progress", function(evt){
16           if (evt.lengthComputable) {
17               var percentComplete = evt.loaded / evt.total;
18               // Do something with download progress
19               console.log(percentComplete);
20           }
21       }, false);
22
23       return xhr;
24    },
25    type: 'POST',
26    url: "/",
27    data: {},
28    success: function(data){
29        // Do something success-ish
30    }
31});

1ajax xhr