语法：

s$ = ENVIRON$({parameter_string | n})

实测，WIN7 下，XP只有29个，注意：不能用数字取，因为系统不同，内容不同

1  ALLUSERSPROFILE=C:\ProgramData

2  APPDATA=C:\Users\Administrator\AppData\Roaming

3  CommonProgramFiles=C:\Program Files (x86)\Common Files

4  CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files

5  CommonProgramW6432=C:\Program Files\Common Files

6  COMPUTERNAME=YONGFANG

7  ComSpec=C:\Windows\system32\cmd.exe

8  DEVMGR_SHOW_DETAILS=1

9  FP_NO_HOST_CHECK=NO

10  HOMEDRIVE=C:

11  HOMEPATH=\Users\Administrator

12  LOCALAPPDATA=C:\Users\Administrator\AppData\Local

13  LOGONSERVER=\\YONGFANG

14  NUMBER_OF_PROCESSORS=8

15  OS=Windows_NT

16  Path=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\

17  PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC

18  PROCESSOR_ARCHITECTURE=x86

19  PROCESSOR_ARCHITEW6432=AMD64

20  PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 42 Stepping 7, GenuineIntel

21  PROCESSOR_LEVEL=6

22  PROCESSOR_REVISION=2a07

23  ProgramData=C:\ProgramData

24  ProgramFiles=C:\Program Files (x86)

25  ProgramFiles(x86)=C:\Program Files (x86)

26  ProgramW6432=C:\Program Files

27  PSModulePath=C:\Windows\system32\WindowsPowerShell\v1.0\Modules\

28  PUBLIC=C:\Users\Public

29  SESSIONNAME=Console

30  SystemDrive=C:

31  SystemRoot=C:\Windows

32  TEMP=S:\

33  TMP=S:\

34  USERDOMAIN=YONGFANG

35  USERNAME=Administrator

36  USERPROFILE=C:\Users\Administrator

37  windir=C:\Windows

38  windows_tracing_flags=3

39  windows_tracing_logfile=C:\BVTBin\Tests\installpackage\csilogfile.log

XP系统下------------------------------------------------------------------

1  ALLUSERSPROFILE=C:\Documents and Settings\All Users

2  APPDATA=C:\Documents and Settings\Administrator\Application Data

3  CLIENTNAME=Console

4  CommonProgramFiles=C:\Program Files\Common Files

5  COMPUTERNAME=PC-20141206HRKK

6  ComSpec=C:\WINDOWS\system32\cmd.exe

7  FP_NO_HOST_CHECK=NO

8  HOMEDRIVE=C:

9  HOMEPATH=\Documents and Settings\Administrator

10  LOGONSERVER=\\PC-20141206HRKK

11  NUMBER_OF_PROCESSORS=2

12  OS=Windows_NT

13  Path=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem

14  PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH

15  PROCESSOR_ARCHITECTURE=x86

16  PROCESSOR_IDENTIFIER=x86 Family 6 Model 42 Stepping 7, GenuineIntel

17  PROCESSOR_LEVEL=6

18  PROCESSOR_REVISION=2a07

19  ProgramFiles=C:\Program Files

20  SESSIONNAME=Console

21  SystemDrive=C:

22  SystemRoot=C:\WINDOWS

23  TEMP=C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp

24  TMP=C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp

25  USERDOMAIN=PC-20141206HRKK

26  USERNAME=Administrator

27  USERPROFILE=C:\Documents and Settings\Administrator

28  windir=C:\WINDOWS

29  _DFX_INSTALL_UNSIGNED_DRIVER=1

WIN10系统下  ------------------------------------------------------------

1  ALLUSERSPROFILE=C:\ProgramData

2  APPDATA=C:\Users\w10\AppData\Roaming

3  CommonProgramFiles=C:\Program Files\Common Files

4  COMPUTERNAME=WIN-5VHV9G20U4C

5  ComSpec=C:\Windows\system32\cmd.exe

6  FPS_BROWSER_APP_PROFILE_STRING=Internet Explorer

7  FPS_BROWSER_USER_PROFILE_STRING=Default

8  HOMEDRIVE=C:

9  HOMEPATH=\Users\w10

10  LOCALAPPDATA=C:\Users\w10\AppData\Local

11  LOGONSERVER=\\WIN-5VHV9G20U4C

12  NUMBER_OF_PROCESSORS=2

13  OS=Windows_NT

14  Path=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\

15  PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC

16  PROCESSOR_ARCHITECTURE=x86

17  PROCESSOR_IDENTIFIER=x86 Family 6 Model 42 Stepping 7, GenuineIntel

18  PROCESSOR_LEVEL=6

19  PROCESSOR_REVISION=2a07

20  ProgramData=C:\ProgramData

21  ProgramFiles=C:\Program Files

22  PSModulePath=C:\Windows\system32\WindowsPowerShell\v1.0\Modules\

23  PUBLIC=C:\Users\Public

24  SESSIONNAME=Console

25  SystemDrive=C:

26  SystemRoot=C:\Windows

27  TEMP=C:\Users\w10\AppData\Local\Temp

28  TMP=C:\Users\w10\AppData\Local\Temp

29  USERDOMAIN=WIN-5VHV9G20U4C

30  USERDOMAIN_ROAMINGPROFILE=WIN-5VHV9G20U4C

31  USERNAME=w10

32  USERPROFILE=C:\Users\w10

33  windir=C:\Windows

34  __COMPAT_LAYER=DetectorsWin8