批处理如何延迟

方法一：
@echo off
:loop
    echo %time%
    ping 127.1 -n 2 1>nul
    echo %time%
goto loop
方法二：
@echo off
:loop
    echo %time%
    call :delay 1000
    echo %time%
goto loop

:delay
    set /a num=num + 1
    if %num% geq %1 (set num=) && goto :eof
rem    for /l %%i in (1,1,%1) do echo. >nul
goto :eof