获取某一文件夹的路径，窗口会显示该文件夹中的文件类型，指定某一类型，选择删除按钮，则该文件夹中该类型的文件将被删除。-Access to a folder path, the window will display the folder file type, specify a certain type, select the delete button, the folder of the types of files will be deleted.