How the front-end js encapsulates the returned array with picture information into the background and receives it with MultipartFile

what is returned in this picture is the picture information selected when the picture is uploaded
code is as follows

var imgFile = new ImgUploadeFiles(".box",function(e){
            this.init({
                MAX : 3, //
                MH : 5800, //
                MW : 5900, //
                callback : function(arr){
                    console.log(arr)
                }
            });
        });

if input name is file, you can only get one value at a time from the backend

.

in the above code, you can console the selected picture
after each selection, but I don"t know how the array in this array format will be transmitted to the background and what type of receiver will be used

.
Mar.12,2021
Menu