ASP驗證碼如何實現檢驗?
初學ASP,想在登錄時用隨機驗證碼,以防止登錄密碼被破解,可是不知道如何實現?請各們幫忙。我已經找到了如何產生驗證的函數。
<%
function StrRan(byVal maxLen)
Dim strNewPass
Dim whatsNext, upper, lower, intCounter
Randomize
For intCounter = 1 To maxLen
whatsNext = Int((1 - 0 + 1) * Rnd + 0)
If whatsNext = 0 Then
upper = 90
lower = 65
Else
upper = 57
lower = 48
End If
strNewPass = strNewPass & Chr(Int((upper - lower + 1) * Rnd + lower))
Next
StrRan = strNewPass
end function
%>
<%response.write StrRan(4)%>
<input type="submit" name="Submit" value="確定" >