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HTML中调用代码如下：
<img src="http://www.cc535.com/getcheckcode.asp?checkcodename=checkcode" alt="验证码" border="0" width="60" height="20" title="看不清？点一下" align="bottom" onclick="javascript:this.src='http://www.cc535.com/getcheckcode.asp?checkcodename=checkcode&getrandom=' + Math.random() ;" style="cursor:pointer;" />
ASP文件名称为：getcheckcode.asp，代码如下（仅此一个ASP文件即可生成，无需其它文件）：
<%
Call Com_CreatValidCode(trim(request.QueryString("checkcodename")))
Sub Com_CreatValidCode(pSN) '参数：验证码SESSION名称
Response.Expires = -9999
Response.AddHeader "Pragma","no-cache"
Response.AddHeader "cache-ctrol","no-cache"
Response.ContentType = "Image/BMP"
Randomize
Dim i, ii, iii
const cnum=4 '验证码位数，从0开始，3表示4位
Const cOdds = 0 ' 杂点出现的机率
'Const cAmount = 10 ' 文字数量：前面多少个字符中随机筛选，10为纯数字
Const cAmount = 36 ' 文字数量，36为数字字母混合
Const cCode = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
const cwidth=12 '字宽(要为4的倍数)，固定值，不可修改
const cheight=12 '字高，固定值，不可修改
' 随机产生字符
redim vCode(cnum)
dim vCodes
For i = 0 To cnum
vCode(i) = Int(Rnd * cAmount)
vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1)
Next
Session(pSN) = vCodes '记录入Session
' 字符的数据
Dim vNumberData(35)
vNumberData(0) = "111111111111111000000111110111111011110111111011110110011011110110011011110110011011110110011011110111111011110111111011111000000111111111111111"
vNumberData(1) = "111111111111111110111111111000111111111110111111111110111111111110111111111110111111111110111111111110111111111110111111111000001111111111111111"
vNumberData(2) = "111111111111111100001111111011110111111011110111111111110111111111101111111111011111111110111111111101111111111011110111111000000111111111111111"
vNumberData(3) = "111111111111111100001111111011110111111011110111111111101111111110011111111111101111111111110111111011110111111011110111111100001111111111111111"
vNumberData(4) = "111111111111111111011111111111011111111110011111111101011111111011011111111011011111111000000111111111011111111111011111111110000111111111111111"
vNumberData(5) = "111111111111111000000111111011111111111011111111111010001111111001110111111111110111111111110111111011110111111011110111111100001111111111111111"
vNumberData(6) = "111111111111111110001111111101110111111011111111111011111111111010001111111001110111111011110111111011110111111011110111111100001111111111111111"
vNumberData(7) = "111111111111111000000111111011101111111011101111111111011111111111011111111110111111111110111111111110111111111110111111111110111111111111111111"
vNumberData(8) = "111111111111111100001111111011110111111011110111111011110111111100001111111101101111111011110111111011110111111011110111111100001111111111111111"
vNumberData(9) = "111111111111111100011111111011101111111011110111111011110111111011100111111100010111111111110111111111110111111011101111111100011111111111111111"
vNumberData(10) = "111111111111111110111111111110111111111101011111111101011111111101011111111101011111111000001111111011101111111011101111110001000111111111111111"
vNumberData(11) = "111111111111110000001111111011110111111011110111111011101111111000011111111011101111111011110111111011110111111011110111110000001111111111111111"
vNumberData(12) = "111111111111111100000111111011110111110111110111110111111111110111111111110111111111110111111111110111110111111011101111111100011111111111111111"
vNumberData(13) = "111111111111110000011111111011101111111011110111111011110111111011110111111011110111111011110111111011110111111011101111110000011111111111111111"
vNumberData(14) = "111111111111110000001111111011110111111011011111111011011111111000011111111011011111111011011111111011111111111011110111110000001111111111111111"
vNumberData(15) = "111111111111110000001111111011110111111011011111111011011111111000011111111011011111111011011111111011111111111011111111110001111111111111111111"
vNumberData(16) = "111111111111111100001111111011101111110111101111110111111111110111111111110111111111110111000111110111101111111011101111111100011111111111111111"
vNumberData(17) = "111111111111110001000111111011101111111011101111111011101111111000001111111011101111111011101111111011101111111011101111110001000111111111111111"
vNumberData(18) = "111111111111111000001111111110111111111110111111111110111111111110111111111110111111111110111111111110111111111110111111111000001111111111111111"
vNumberData(19) = "111111111111111100000111111111011111111111011111111111011111111111011111111111011111111111011111111111011111110111011111110000111111111111111111"
vNumberData(20) = "111111111111110001000111111011101111111011011111111010111111111000111111111010111111111011011111111011011111111011101111110001000111111111111111"
vNumberData(21) = "111111111111110001111111111011111111111011111111111011111111111011111111111011111111111011111111111011111111111011110111110000000111111111111111"
vNumberData(22) = "111111111111110001000111111001001111111001001111111001001111111010101111111010101111111010101111111010101111111010101111110010100111111111111111"
vNumberData(23) = "111111111111110001000111111001101111111001101111111010101111111010101111111010101111111011001111111011001111111011001111110001101111111111111111"
vNumberData(24) = "111111111111111100011111111011101111110111110111110111110111110111110111110111110111110111110111110111110111111011101111111100011111111111111111"
vNumberData(25) = "111111111111110000001111111011110111111011110111111011110111111000001111111011111111111011111111111011111111111011111111110001111111111111111111"
vNumberData(26) = "111111111111111100011111111011101111110111110111110111110111110111110111110111110111110111110111110100110111111011001111111100010111111111111111"
vNumberData(27) = "111111111111110000011111111011101111111011101111111011101111111000011111111010111111111011011111111011011111111011101111110001100111111111111111"
vNumberData(28) = "111111111111111100000111111011110111111011110111111011111111111100111111111111001111111111110111111011110111111011110111111000001111111111111111"
vNumberData(29) = "111111111111110000000111110110110111111110111111111110111111111110111111111110111111111110111111111110111111111110111111111100011111111111111111"
vNumberData(30) = "111111111111110001000111111011101111111011101111111011101111111011101111111011101111111011101111111011101111111011101111111100011111111111111111"
vNumberData(31) = "111111111111110001000111111011101111111011101111111011101111111101011111111101011111111101011111111101011111111110111111111110111111111111111111"
vNumberData(32) = "111111111111110010100111111010101111111010101111111010101111111010101111111001001111111101011111111101011111111101011111111101011111111111111111"
vNumberData(33) = "111111111111110001000111111011101111111101011111111101011111111110111111111110111111111101011111111101011111111011101111110001000111111111111111"
vNumberData(34) = "111111111111110001000111111011101111111011101111111101011111111101011111111110111111111110111111111110111111111110111111111100011111111111111111"
vNumberData(35) = "111111111111111000000111111011101111111111101111111111011111111111011111111110111111111110111111111101111111111101110111111000000111111111111111"
dim picwidth : picwidth=(cnum+1)*cwidth '字符个数*字宽=图片宽度
dim picdatasize : picdatasize=picwidth*cheight*3 '宽*高*3
dim filesize : filesize=picdatasize+54
' 输出图像文件头
Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(filesize mod 256) & chrB((filesize\256) mod 256) & ChrB(((filesize\256)\256) mod 256) & ChrB(((filesize\256)\256)\256) &_
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(picwidth mod 256) & chrB((picwidth\256) mod 256) & ChrB(((picwidth\256)\256) mod 256) & ChrB(((picwidth\256)\256)\256) & ChrB(cheight mod 256) & chrB((cheight\256) mod 256) & ChrB(((cheight\256)\256) mod 256) & ChrB(((cheight\256)\256)\256) & ChrB(1) & ChrB(0)
'文件标识(2bytes)：ChrB(66) & ChrB(77) 即BM
'文件大小(1dword)：ChrB(230) & ChrB(4) & ChrB(0) & ChrB(0)
'保留字(1dword)：ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) 说明：保留，必须设置为0
'偏移量(1dword)：ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) 说明：从文件开始到位图数据开始之间的数据偏移量
'位图信息头长度(1dword)：ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0)
'位图的宽度(1word)：ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) 说明：单位为像素
'位图的高度(1dword)：ChrB(10) & ChrB(0) & ChrB(0) & ChrB(0)
'位图的位面数(1dword)：ChrB(1) & ChrB(0) 说明：该值总为1
' 输出图像信息头
Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_
ChrB(picdatasize Mod 256) & ChrB((picdatasize\256) Mod 256) & ChrB((picdatasize\256\256) Mod 256) & ChrB(picdatasize\256\256\256) & 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)
'每个像素的位数(2bytes)：ChrB(24) & ChrB(0) 说明：1-单色位图;4-16色位图;8-256色位图;16-16bit;24-24bits;32-32bit
'压缩说明(1dword)：ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) 说明:0-不压缩;1-rel8压缩;2-rel4压缩;3-bitfields一位域存放
'用字节数表示位图数据大小(1dword)：ChrB(176) & ChrB(4) & ChrB(0) & ChrB(0) 说明：4的倍数；
'水平分辨率(1dword):ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) 说明：单位为，像素/米
'垂直分辨率(1dword)：ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0)
'位图使用的颜色数(1dword)：ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
'重要颜色数(1dword)：ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) 说明：0-表示所有数据一样重要
redim temp_color(cnum),tem_i(cnum)
For i = cheight-1 To 0 Step -1 ' 历经所有行（按高的每1px逐行输出）
For ii = 0 To cnum ' 历经所有字符
For iii = 1 To cwidth ' 历经所有像素（按字符宽度逐像素输出）
' 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
Response.BinaryWrite com_vColorData(1) '输出杂点
Else
dim abc : abc=clng(Mid(vNumberData(vCode(ii)), i * cwidth + iii, 1))
if abc=1 then
Response.BinaryWrite com_vColorData(0) '输出背景
else
if tem_i(ii)<>1 then
tem_i(ii)=1
temp_color(ii)=com_vColorData(1) '获取字符颜色
end if
Response.BinaryWrite temp_color(ii) '输出字符
end if
End If
Next
Next
Next
End Sub
' 颜色的数据(背景/字符)
function com_vColorData(n)
dim return
if n=0 then '背景
return=ChrB(250) & ChrB(240) & ChrB(230) '淡蓝色
else '字符
return=ChrB(clng(rnd*220)) & ChrB(clng(rnd*210)) & ChrB(clng(rnd*200)) '前景
end if
com_vColorData=return
end function
%>
