遍历当前文件夹所有子目录，并将当前文件夹下所有JPG文件统一重命名，并复制到当前目录下，适合多文件夹下多图片管理，两种遍历方法-Traverse all the subdirectories of the current folder and all of the current folder unified JPG files to rename, and copy to the current directory, for many more pictures folder management, the two traversal methods