v2.1更新内容：

1、取消大小写敏感检测（此举动产生一定安全隐患，请服务端上传脚本对上传文件做安全过滤）。

2、加入单选、批量模式转换，maxNum=1的时候自动转换为单选模式。

3、加入自定义文件域名称“fileName”，此参数可选默认是Filedata。

4、加入上传取消功能，允许在上传中主动取消上传动作。

5、修改文件浏览窗口，显示允许上传的后缀名称。

6、加入上传进度百分比文字提示。-v2.1 update:

1, the cancellation case sensitive detection of (this act a certain security risk, please upload the scr ipt on the server to upload files to do security filtering).

2, add the radio, batch mode conversion, maxNum = 1 when the model is automatically converted to the radio.

3, by adding custom file domain name "fileName", this parameter is optional default Filedata.

4, adding upload cancel the function, allowing the initiative to cancel the upload upload action.

5, modify the file browser window that displays allows you to upload the suffix name.

6, by adding the percentage of text prompts upload progress.