实现自删除的源代码，与上次上传的不一致，这是用批处理文件实现，功能更加强大，非常适合于新手，里面的思路很清晰，有兴趣的可以-To realize the of the source code, and delete last time is not the same upload, which are a batch file, more powerful, and realize the function is very suitable for beginners, inside think