dazheng

@echo off & mode con cols=31 lines=15
title 倒计时

@echo.&@echo.&@echo.
@echo 倒计时开始：
setlocal enabledelayedexpansion
set num=10
:begin
if not !num! equ 0 for /f %%a in ("%num%")do (@echo %%a & ping /n 2 127.1>nul & set /a num-=1 & goto begin) else (pause>nul)