layui upload文件上传查询不到返回值

 

 

 

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var name = "${student.realname}"        //选完文件后不自动上传        upload.render({            elem: '#test8'            ,url: 'poor/upload', //改成您自己的上传接口            data:{                nameold:oldaddress,                a:name            }            ,before: function(obj){                // this.data.nameold = oldaddress                obj.preview(function(index, file, result){                    $('#demo1').attr('src', result); //图片链接（base64）                });            }            ,auto: false            //,multiple: true            ,bindAction: '#test9'            ,done: function(res){                layer.msg('上传成功');                oldaddress = res.data            }        });

　　文件上传时发现后台获取不到回调的旧地址

 

 查询发现需要把data数据before重新赋值