<%
Option Explicit
Response.buffer=true
Response.Expires = -1
Response.ExpiresAbsolute = Now() - 1
Response.Addheader   "cache-control","no-cache"  
Response.AddHeader   "Pragma","no-cache"
Response.ContentType = "Image/BMP"

Call Com_CreatValidCode()

Sub Com_CreatValidCode()
       
        Randomize
       
        Dim i, ii, iii
       
        Const cOdds = 1 ' 杂点出现的机率
        Const cAmount = 10 ' 文字数量
        Const cCode = "0123456789"
       
        ' 颜色的数据(字符，背景)
        Dim vColorData(1)
        vColorData(0) = ChrB(0) & ChrB(0) & ChrB(2)  ' 蓝0，绿0，红0（黑色）
        vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) ' 蓝250，绿236，红211（浅蓝色）
       
        ' 随机产生字符
        Dim vCode(4), vCodes
        For i = 0 To 3
          vCode(i) = Int(Rnd * cAmount)
          vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1)
        Next
        Session("Verifycode") = vCodes  '记录入Session
        ' 字符的数据
        Dim vNumberData(9)
        vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111"
        vNumberData(1) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111"
        vNumberData(2) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011"
        vNumberData(3) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111"
        vNumberData(4) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011"
        vNumberData(5) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111"
        vNumberData(6) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111"
        vNumberData(7) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111"
        vNumberData(8) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111"
        vNumberData(9) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111"
        ' 输出图像文件头
        Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(230) & ChrB(4) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_
          ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) &_
          ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(10) & ChrB(0) &_
          ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0)
       
        ' 输出图像信息头
        Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(176) & ChrB(4) &_
          ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) &_
          ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_
          ChrB(0) & ChrB(0)
       
        For i = 9 To 0 Step -1  ' 历经所有行
                For ii = 0 To 3  ' 历经所有字
                        For iii = 1 To 10 ' 历经所有像素
                                ' 逐行、逐字、逐像素地输出图像数据
                                If Rnd * 99 + 1 < cOdds Then ' 随机生成杂点
                                        If Mid(vNumberData(vCode(ii)), i * 10 + iii, 1) Then
                                                Response.BinaryWrite vColorData(0)
                                        Else
                                                Response.BinaryWrite vColorData(1)
                                        End If
                                Else
                                        Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))
                                End If
                        Next
                Next
        Next
End Sub
%>

找什么，不知怎么换？

看来是没办法了。