文件批量上传客户端免费组件 基于FLASH制作,所以使用者不会要求下载组件 丰富的设置 可以在上传前就进行文件类型和文件大小的检测,节省宽带.-File bulk upload Client-free components based on FLASH production, so users will not require download the rich set of components can be uploaded before the file type and file siz