_this.fileList.push(json);

_this.fileList[$file.index()] = json;

 data = this.fileList[i];

           if (data == undefined) {
                    continue;
                }

_this.imageList.push(json);

_this.imageList[$file.index()] = json;

data = this.imageList[i];
//在下面添加
if (data == undefined) {
                    continue;
                }