1、支持上传多个文件2、支持上传各种文件格式的文件3、可以设置上传文件的目录4、可以将上传的文件改名保存5、支持上传图片生成缩略处理6、可以判断上传文件的大小、文件类型-a support multiple files to upload 2, support a variety of file formats to upload the document three, set the upload directory four documents can be uploaded file na