asp实现带刷新功能的验证码代码

　　将以下代码放到一个单独的页面checkcode.asp

　　 <% Option Explicit Response.buffer=true Call Com_CreatValidCode(validateCode) Sub Com_CreatValidCode(pSN) 禁止缓存tentType = Image/BMP Randomize Dim i, ii, iii Const cOdds = 2 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(211) 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(pSN) = vCodes 记录入Session 字符的数据 Dim vNumberData(9) vNumberData(0) = 1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111 110000111 vNumberData(1) = 1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111 100000111 vNumberData(2) = 1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111 100000011 vNumberData(3) = 1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111 110000111 vNumberData(4) = 1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111 111000011 vNumberData(5) = 1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111 110000111 vNumberData(6) = 1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111 110000111 vNumberData(7) = 1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111 111011111 vNumberData(8) = 1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111 110000111 vNumberData(9) = 1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111 110001111 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 Response.BinaryWrite vColorData(0) Else Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1)) End If Next Next Next End Sub %>

　　需要用得页面用如下方式引用：

　　验证码： src=checkcode.asp alt=验证码,看不清楚?请点击刷新验证码 height=10 style=cursor :
pointer; onClick=this.src=checkcode.asp?t=+(new Date().getTime()); >

　　判断页面：

　　 <% if trim(session(validateCode)) <> trim(Request(txt_check)) then ErrorMessage = 请输入正确的验证码 response.write( <script>alert(&ErrorMessage&);location.href=Default.asp </script>) response.end end if %>

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