本地JS文件批量压缩

@ECHO OFF
setlocal enabledelayedexpansion
set source_path=%1
set target_dir=%2
IF [%1]==[] ( 
      rem echo please input javascript file or directory 
      set /p  source_path=please input javascript file or directory:
)
IF [%2]==[] ( 
      rem echo please input output directory 
      set /p target_dir=please input output directory:
) 
rem source path exists?
FOR %%i IN (%source_path%) DO SET FileAttrib=%%~ai
if "%FileAttrib%" equ ""   (     
      rem not found file attribute, source path not exist
      echo source path ^(%source_path%^) doesn't exist
      exit /b 0
)   ELSE   IF "%FileAttrib:~0,1%" equ "d" (
      rem source path is directory and not end with \, append \ to source path
      IF %source_path:~-1% neq \ (
            set source_path=%source_path%\
      )   
) 
echo source path is  %source_path%  
rem target path exists?
FOR %%i IN (%target_dir%) DO SET fa=%%~ai
IF   [%fa%]==[]   (
    rem target path not exist, make it
    mkdir %target_dir%
)  
IF %target_dir:~-1% neq \ (
      rem append \ to target path
      set target_dir=%target_dir%\
)
echo target path is %target_dir% 
IF [%FileAttrib:~0,1%]==[d] (
    for /r %source_path% %%I in (*.js) do ( 
      set file_name=%%~nI
      set parent=%%~dpI
      set target_parent=%target_dir%!parent:%source_path%=!
      if not exist !target_parent!  mkdir !target_parent!
      cd !target_parent!
      if [!file_name:~-4!] neq [.min] (      
            set w= uglifyjs %%I -m -c -O ascii_only=true -o   !target_parent!%%~nI.min.js 
            rem uglify .js file
            echo uglifyjs from "%%I" to "!target_parent!%%~nI.min.js"
            start cmd /c  "!w!"
      )  else (
           rem copy min.js file
           echo copy file from "%%~dpnI.js" to "!target_parent!%%~nI.js" 
           start cmd /c "copy  %%~dpnI.js  !target_parent!%%~nI.js" 
      )
    )
) else (
    for %%I in (%source_path%) do (
        IF    "%%~xI" EQU ".js"  (    
             set file_name=%%~nI
              if [!file_name:~-4!] neq [.min] (   
                  rem uglify .js file
                  set val=%target_dir%%%~nI.min.js       
                  echo uglifyjs from "%%I" to "!val!"
                  start cmd /c "uglifyjs  %%I  -m -c  -O ascii_only=true -o   !val!"
              ) else (
                  rem copy min.js file
                  echo copy file from "%%I" to "%target_dir%%%~nI.js"
                  start cmd /c "copy  %%I %target_dir%%%~nI.js"  
              )
        )
    )
)
echo done