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 * * achieve this kind of a JPG/JPEG image file to zoom method is given a JPG file, you can generate a miniature image file of the JPG file (JPG format) * provides three methods of generating image epitome: 1, set the width of the miniature file, according to the set the width and the source image file to determine the size of the length of the file to generate a new miniature miniature image 2 *, set the epitome of the length of the file, according to the length and the source image file to determine the size of the new miniature file width to generate images, set 3 * miniature miniature file relative to the source image file size according to the proportion. The size and set the source image file to determine the proportion of the size of the file to generate a new miniature miniature miniature image * new generated image can be compared to the original image, then that is The source image is placed.)