环境变量

“%”是系统变量的一种表示方法

%HOMEDRIVE% =%SYSTEMDRIVE%= C:\                                      当前启动的系统的所在分区 
 
%windir% = %SystemRoot% = C:\WINDOWS                                 当前启动的系统的所在目录

%USERPROFILE% = C:\Documents and Settings\AAAAA                    当前用户数据变量

%HOMEPATH% = C:\Documents and Settings\AAAAA                        当前用户环境变量

%temp% = %USERPROFILE%\Local Settings\Temp = C:\Documents and Settings\AAAAA\Local Settings\Temp

                                                                                                  当前用户TEMP缓存变量