微软手册只提了一个remove，没提增加，原来是这样。
更改
代码如下:
Set WshShell = Wscript.CreateObject("Wscript.Shell")
WshShell.Environment("user").Item("path")="c:\ruby"
移除：
代码如下:
WshShell.Environment("USER").Remove("LAST_LOGIN_DATE")
附记一下这两个：
代码如下:
Set objAD = CreateObject("ADSystemInfo")
Wscript.Echo "Your Computer Name is " & objAD.ComputerName
Wscript.Echo "Your Username is " & objAD.UserName
WScript.Echo("Hello")
WScript.Interactive = false
WScript.Echo("This wont display")
WScript.Interactive = true
WScript.Echo("This will display")