layui 文件上传加进度条

1.页面
<div class="layui-row layui-col-space5">
                <div class="layui-form-item">
                    <label class="layui-form-label"><i class="i-red"></i>邀请说明</label>
                    <div class="layui-input-block">
                        <div class="layui-col-md2">
                        <button type="button" style="margin-top: 2px;" class="layui-btn" id="js_upload"><i class="layui-icon">�</i>上传文件</button>
                        </div>
                        <div class="layui-col-md7">
                        <input type="text" name="fileName"  autocomplete="off" maxlength="50" class="layui-input js_upload_file_name" value="${inviteMap.fname }" placeholder="" readonly="readonly">
                        </div>
                    </div>
                </div>
                <input type="hidden" name="fileId" class="js_resource_invite_file_id" value="${inviteMap.file_id }">
</div>
<!--弹出进度条-->
<div id="uploadLoadingDiv" style="display: none;">
<div class="layui-progress" lay-showpercent="true" lay-filter="js_upload_progress" style="margin: 10px;">
    <div class="layui-progress-bar layui-bg-red" lay-percent="0%"></div>
    </div>
<div class="layui-form-item" style="text-align: center">
<button class="layui-btn layui-btn-normal js_upload_progress_bar_sure" >确定</button>
</div>
</div>

2.upload.js 搜索ajax
$.ajax({
    url: l.url
    ,type: l.method
    ,data: formData
    ,contentType: false 
    ,processData: false
    ,dataType: 'json'
    ,xhr:l.xhr(function(e){//此处为新添加功能
         var percent=Math.floor((e.loaded / e.total)*100);//计算百分比
         l.progress(percent);//回调将数值返回
     })
     ,success: function(res){
         successful++;
         done(index, res);
         allDone();
     }
     ,error: function(e){
         console.log(e)
         aborted++;
         that.msg('请求上传接口出现异常');
         error(index);
         allDone();
     }
});

3.js
layui.use(['form', 'layedit', 'laydate','element', 'upload','table'], function () {
        var upload = layui.upload,form=layui.form,
        element = layui.element,$=layui.$,table = layui.table,laydate=layui.laydate;
        element.init();
        form.render();
        //日期初始化
        laydate.render({
            elem: '#date_start'
            , type: 'datetime'
        });
      //创建监听函数
        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;
            }
      }
        
        upload.render({
            elem: '#js_upload',
            url: gContextPath+"/uploadfile2.htm"
            ,multiple: false
            ,before:function(){
                element.progress('js_upload_progress', '0%');//设置页面进度条
                    layer.open({
                        type: 1,
                        title: '上传进度',
                        closeBtn: 1, //不显示关闭按钮
                        area: ['300px', '170px'],
                        shadeClose: false, //开启遮罩关闭
                        content: $("#uploadLoadingDiv").html(),
                        offset: '100px'
                    });
            }
            ,xhr:xhrOnProgress
            ,progress:function(value){//上传进度回调 value进度值
                element.progress('js_upload_progress', value+'%');//设置页面进度条
            }
            ,field: 'file'
            , accept: 'images'
            , data: {
                "index": 1,
                "appCbnid":""
            },
            accept: 'file',
            //普通文件
            done: function (res) {
                console.log(res);
                $(".js_upload_file_name").val(res[0].data.filename);
                $(".js_resource_invite_file_id").val(res[0].data.fid);
            },
            error: function () {
                layer.alert("上传失败",{offset: '100px'});
                return false;
            }

        });

        //关闭进度条提示
        $(document).on('click','.js_upload_progress_bar_sure',function(){
            layer.close(layer.index);
         });
        

        
    });