重要事項：系統已不再支援 reCAPTCHA API 1.0 版，請升級至 2.0 版。瞭解詳情
reCAPTCHA ASP 指南可讓您輕鬆在 ASP 上加入人機驗證 (CAPTCHA) 網頁，協助您阻止漫遊器濫用網頁。下方程式碼納入 reCAPTCHA API。
註冊 API 金鑰後，即可將 reCAPTCHA 新增至傳統版 ASP 網站，只要將下方程式碼貼到 也就是 ASP 網頁的頂端：
<%
recaptcha_challenge_field = Request("recaptcha_challenge_field")
recaptcha_response_field = Request("recaptcha_response_field")
recaptcha_public_key = "your_public_key" ' your public key
recaptcha_private_key = "your_private_key" ' your private key
' returns the HTML for the widget
function recaptcha_challenge_writer()
recaptcha_challenge_writer = _
"<script type=""text/javascript"">" & _
"var RecaptchaOptions = {" & _
" theme : 'red'," & _
" tabindex : 0" & _
"};" & _
"</script>" & _
"<script type=""text/javascript"" src=""http://www.google.com/recaptcha/api/challenge?k=" & recaptcha_public_key & """></script>" & _
"<noscript>" & _
"<iframe src=""http://www.google.com/recaptcha/api/noscript?k=" & recaptcha_public_key & """ frameborder=""1""></iframe><>" & _
"<textarea name=""recaptcha_challenge_field"" rows=""3"" cols=""40""></textarea>" & _
"<input type=""hidden"" name=""recaptcha_response_field""value=""manual_challenge"">" & _
"</noscript>"
end function
' returns "" if correct, otherwise it returns the error response
function recaptcha_confirm(rechallenge,reresponse)
Dim VarString
VarString = _
"privatekey=" & recaptcha_private_key & _
"&remoteip=" & Request.ServerVariables("REMOTE_ADDR") & _
"&challenge=" & rechallenge & _
"&response=" & reresponse
Dim objXmlHttp
Set objXmlHttp = Server.CreateObject("Msxml2.ServerXMLHTTP")
objXmlHttp.open "POST", "https://www.google.com/recaptcha/api/verify", False
objXmlHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
objXmlHttp.send VarString
Dim ResponseString
ResponseString = split(objXmlHttp.responseText, vblf)
Set objXmlHttp = Nothing
if ResponseString(0) = "true" then
'They answered correctly
recaptcha_confirm = ""
else
'They answered incorrectly
recaptcha_confirm = ResponseString(1)
end if
end function
server_response = ""
newCaptcha = True
if (recaptcha_challenge_field <> "" or recaptcha_response_field <> "") then
server_response = recaptcha_confirm(recaptcha_challenge_field, recaptcha_response_field)
newCaptcha = False
end if
%>
接下來會發生下列情況：server_response 和 newCaptcha 變數
載入網頁狀態，方便您判斷網頁狀態。
您可以使用下列 HTML 做為基本架構：
<html> <body> <% if server_response <> "" or newCaptcha then %> <% if newCaptcha = False then %> <!-- An error occurred --> Wrong! <% end if %> <!-- Generating the form --> <form action="recaptcha.asp" method="post"> <%=recaptcha_challenge_writer()%> </form> <% else %> <!-- The solution was correct --> Correct! <%end if%> </body> </html>