1、判断x 变量是否在foo变量中

echo "%foo%" | findstr /C:"%x%"

** 2、 函数写法** 参考：

@echo off  set "aStr=Expect no changed, even if used in function"  set "var1=Expect changed"  echo.aStr before: %aStr%  echo.var1 before: %var1%  call:myGetFunc var1  echo.aStr after : %aStr%  echo.var1 after : %var1%  echo.&pause&goto:eof  ::--------------------------------------------------------  ::-- Function section starts below here  ::--------------------------------------------------------  :myGetFunc    - passing a variable by reference  SETLOCAL  set "aStr=DosTips"  ( ENDLOCAL      set "%~1=%aStr%"  )  goto:eof  :myGetFunc2    - passing a variable by reference  SETLOCAL  set "aStr=DosTips"  ENDLOCAL&set "%~1=%aStr%"       &rem THIS ALSO WORKS FINE  goto:eof

一个标准函数定义

:myFunctionName    -- function description here  ::                 -- %~1: argument description here  SETLOCAL  REM.--function body here  set LocalVar1=...  set LocalVar2=...  (ENDLOCAL & REM -- RETURN VALUES      IF "%~1" NEQ "" SET %~1=%LocalVar1%      IF "%~2" NEQ "" SET %~2=%LocalVar2%  )  GOTO:EOF