Jquery Ajax进度条

代码： 

/* 进度条 */
var xhr=new XMLHttpRequest(); xhr.upload.onprogress=function(e){}
var xhrOnProgress=function(fun) {
	xhrOnProgress.onprogress = fun; //绑定监听
	//使用闭包实现监听绑
	return function() {
		//通过$.ajaxSettings.xhr();获得XMLHttpRequest对象
		var xhr = $.ajaxSettings.xhr();
		//判断监听函数是否为函数
		if (typeof xhrOnProgress.onprogress !== 'function')
			return xhr;
		//如果有监听函数并且xhr对象支持绑定时就把监听函数绑定上去
		if (xhrOnProgress.onprogress && xhr.upload) {
			xhr.upload.onprogress = xhrOnProgress.onprogress;
		}
		return xhr;
	}
}
/* 上传文件 */
var formData = new FormData(document.getElementById("form22"));
$.ajax({
	url: baseURL+'appInfo/addAppInfo',
	type: 'post',
	data: formData,
	ansyc:false,
	processData: false,  // 不处理数据
	contentType: false,  // 不设置内容类型
	xhr:xhrOnProgress(function(e){
		var per=100 * e.loaded / e.total;//计算百分比
		var son =  document.getElementById('tiao');
		son.innerHTML = per + "%";
		son.style.width = per + "%";
	}),
	success: function(dd){
		if(dd.code==0){
			layer.msg('已添加');
			tableins.reload();
			layer.close(index);
		}else{
			layer.msg(dd.msg);
		}
	},
	error: function (dd) {
		layer.msg("异常");
		layer.close(index);
	}
});

html进度条