Const imgS_DIR = "/images" 
  '设定图片文件夹的地址,随机显示该文件夹内任一张图片 
  Dim objFSO, objFolderObject, objFileCollection, objFile 
  Dim intFileNumberToUse, intFileLooper 
  Dim objImageFileToUse 
  Dim strImageSrcText 
  Set objFSO = Server.CreateObject("Scripting.FileSystemObject") 
  Set objFolderObject = objFSO.GetFolder(Server.MapPath(imgS_DIR)) 
  Set objFSO = Nothing 
  Set objFileCollection = objFolderObject.Files 
  Set objFolderObject = Nothing 
  Randomize() 
  intFileNumberToUse = Int(objFileCollection.Count * Rnd) + 1 
  intFileLooper = 1 
  For Each objFile in objFileCollection 
  If intFileLooper = intFileNumberToUse Then 
  Set objImageFileToUse = objFile 
  Exit For 
  End If 
  intFileLooper = intFileLooper + 1 
  Next 
  Set objFileCollection = Nothing 
  strImageSrcText = imgS_DIR & objImageFileToUse.Name 
  Set objImageFileToUse = Nothing
 
  #pic{ 
  width: 400px; 
  height: 300px; 
  background: url() no-repeat; 
  margin: 2em auto; 
  } 
  上面代码要加在head区,不能放在外部CSS文件里。