JPEG图片中的EXIF信息是以TIFF格式保存的，本文中将介绍EXIF中都保存了哪些数据，这些数据的内容和格式，最后介绍一下EXIF中的缩略图信息。(The EXIF information in the JPEG picture is saved in TIFF format. This article describes what data is saved in EXIF, the content and format of those data, and finally the thumbnail information in EXIF.)