tevktev

@echo off
set pass=123
:again
set /p enter=请输入密码:
set /a sum+=1
if "%sum%" equ "3" echo 错误次数太多，禁止登陆&pause>nul&goto: eof 
if "%pass%"=="%enter%" (echo 登陆成功&pause&goto: eof ) else (echo 密码错误&goto :again)
pause
 
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