สอบถามเรื่องถ้าอยากเขียน CODE ตัวนี้ให้สั้นลง (jquery preview upload mutiple file)

    $(".img").on("change", function()
    {
	var imgpreview = $(this).parent().find('div');
        var files = !!this.files ? this.files : [];
        if (!files.length || !window.FileReader) return; // no file selected, or no FileReader support
 
        if (/^image/.test( files[0].type)){ // only image file
            var reader = new FileReader(); // instance of the FileReader
            reader.readAsDataURL(files[0]); // read the local file
 
            reader.onloadend = function(){ // set image data as background of div
/*			var a = $(this.find('div').css( "background-color", "red" );*/
                $((imgpreview)).css("background-image", "url("+this.result+")");
            }
        }
    });	

var tmpID=''
$(".fileupload").on("change", function(){
	tmpID = $(this).attr('id')=='uploadfile'? '' : 1;
	var files = !!this.files ? this.files : [];
	if (!files.length || !window.FileReader) return; // no file selected, or no FileReader support
	if (/^image/.test( files[0].type)){ // only image file
		var reader = new FileReader(); // instance of the FileReader
		reader.readAsDataURL(files[0]); // read the local file
		reader.onloadend = function(){ // set image data as background of div
			$("#imagePreview"+tmpID).css("background-image", "url("+this.result+")");
		}
	}
});