图片上传的进度条-jquery

<div style="padding: 10px;">
                <div class="progress-bar" style="display: none;">
                    <div class="progress-bar-plan"></div>
                    <div class="progress-bar-font">
                        0%
                    </div>
                </div>
            </div>

　　

$("#btn_save").click(function ()
        {
            var formData = new FormData();

            if ($("input[type='file']").length > 1)
            {
                $(".progress-bar").show();
                $(".progress-bar-plan").css("background-color", "red");

                $("input[type='file']").each(function (index, item)
                {
                    formData.append("file", $("input[type='file']")[index].files[0]);
                })
            }
            //首先封装一个方法 传入一个监听函数 返回一个绑定了监听函数的XMLHttpRequest对象
            var xhrOnProgress = function (fun)
            {
                xhrOnProgress.onprogress = fun; //绑定监听
                //使用闭包实现监听绑
                return function ()
                {
                    //通过$.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;
                }
            }

            $.ajax({
                url: "/Interface/DealAlarm",
                type: 'POST',
                data: formData,
                // 告诉jQuery不要去处理发送的数据
                processData: false,
                // 告诉jQuery不要去设置Content-Type请求头
                contentType: false,
                //beforeSend: function ()
                //{
                //    console.log("正在进行，请稍候");
                //},
                xhr: xhrOnProgress(function (evt)
                {
                    var percent = Math.floor(evt.loaded / evt.total * 100);//计算百分比

                    $(".progress-bar-plan").css("width", percent + "%");
                    $(".progress-bar-font").html(percent + '%');

                    if (percent == 100)
                    {
                        $(".progress-bar-plan").css("background-color", "#0bae27");
                    }
                    ////console.log(percent);
                    //// 设置进度条样式
                    //$('#jdt').css('width',percent * 3 + 'px');
                    //$('#jdt').css('background','skyblue');
                    ////显示进度百分比
                    //$('#jdt').text(percent+'%');
                    //$('#loaded').text(evt.loaded/1024 + 'K');
                    //$('#total').text(evt.total/1024 + 'K');
                }),
                success: function (response)
                {
                    var result = JSON.parse(response);

                    if (result.Code == 0)
                    {
                        history.go(-2);
                    }
                    else
                    {
                        alert(result.Message);
                    }
                },
                error: function (responseStr)
                {
                    console.log("error");
                }
            });
        })