China DOS Union

@echo off
rem set the mapped drive letter
set mm=k:
rem set the source folder path
set lj=d:\1\
rem set the target folder path
set mb=1
echo The following computers did not finish copying because they were shut down! In the spirit of being conscientious and responsible about the work, please check them! > d:\err.txt
echo Computers copied successfully! > d:\ok.txt
:star
if "%1"=="" goto end
net use "%mm%" \\%1\d sa0714
if not exist "%mm%"\*.* goto err
cls
echo.
echo.
echo.
echo.
echo.
echo.
echo Copying games to computer %1! The mapped drive you are using now is "%mm%"
echo.
echo.
echo.
echo.
echo.
echo.
xcopy/y/e "%lj%" ""%mm%"\"%mb%"\"
if errorlevel 5 goto err1
if errorlevel 4 goto err1
if errorlevel 3 goto err1
if errorlevel 2 goto err1
if errorlevel 1 goto err1
if errorlevel 0 goto ok1
k1
echo Computer %1 has been copied successfully >>d:\ok.txt
net use "%mm%" /del /y
shift
goto star
:err
cls
echo.
echo.
echo.
echo.
echo.
echo.
echo Computer %1 may be shut down! Please check!
echo.
echo.
echo.
echo.
echo.
echo.
echo %1 >>d:\err.txt
shift
goto star
:err1
cls
echo.
echo.
echo.
echo.
echo.
echo.
echo Computer %1 has been interrupted! It may be that the target computer shut down abnormally or restarted, or that disk space is insufficient
echo.
echo.
echo.
echo.
echo.
echo.
echo %1 >>d:\err.txt
shift
goto star
:end
cls
echo.
echo.
echo.
echo.
echo.
echo.
echo Copyright of this program belongs to Zhang Qiang Tel: 8901381
echo.
echo.
echo.
echo.
echo.
echo.
c:\windows\NOTEPAD.EXE d:\err.txt
c:\windows\NOTEPAD.EXE d:\ok.txt
rem set the mapped drive letter
set mm=
rem set the source folder path
set lj=
rem set the target folder path
set mb=

My skill level is limited. Could everyone help me improve it a bit?

What kind of optimization are you trying to make?

Take a look and see whether there are any mistakes~ things like that~!
Can it be made a bit better~