说明：  JPG图像文件类型变焦*这个类实现了一个JPG JPEG图像文件的缩放方法给出一个jpg文件，你可以生成一个jpg文件的微型图像文件（JPG格式）*提供了生成图像的三种方法：1，是集微型文件的宽度，根据设定的宽度和源图像文件来确定该文件的长度尺寸，生成一个新的小型微型图像2×，设置文件的长度的缩影，根据长度和源图像文件确定的新的小型文件的宽度尺寸来生成图像，按比例设置3×缩影文件相对于源图像文件的大小。大小和设置源图像文件以确定文件大小的比例来生成一个新的微型微型图像*新生成的图像可以与原始图像进行比较，然后即是源图像被放置。
(JPG image file type zoom * this class implements a given zoom method of a JPG JPEG image file to a JPG file, micro image file you can generate a JPG file (JPG format) * provides three methods of generating image: 1, is a set of mini file according to the width and the width of the source the image file set to determine the length of the file size, a new generation of small and micro miniature image of 2 *, set file length, to generate the image according to the size of documents to determine the length and width of the source image file of the new, according to the proportion set 3 x miniature file relative to the source image file size. Size and setting the source image file to determine the size of the file size to generate a new miniature image * the newly generated image can be compared with the original image, and then the source image is placed)