jQuery多文件异步上传带进度条实例代码

///作者柯锦
///完成时间2016.08.16
///多文件异步上传带进度条
(function ($) {
function bytesToSize(bytes) {
if (bytes === 0) return '0 B';
var k = 1024, // or 1000
sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
i = Math.floor(Math.log(bytes) / Math.log(k));
return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i];
}
function changeCursor(obj) {
obj.style.cursor = 'pointer'
}
function deleteSelfAndFile(obj) {
var that = $(obj);
var parentLi = that.parent("li");
that.remove();
parentLi.remove();
}
function CreateXMLHttpRequest(target) {
var xhr = new XMLHttpRequest();
//var ops = $.data(target, "KJajaxUpload").Options;
//var v, h, evs = { loadstart: 0, loadend: 0, progress: 0, load: 0, error: 0, abort: 0 };
//for (v in evs) {
// if (h = ops['on' + v]) {
// xhr.upload.addEventListener(v, h, false);
// }
/