google recaptcha v2 验证已过期，但浏览器警报未弹出

Question

我有一个带有验证码的工作表。当我加载网页并单击提交而不选中该框时，会显示警报（单击机器人），但是如果我让验证码过期并再次单击提交，则不会再弹出警报。以下代码是否有问题或有任何重写方法？

<script>
    window.onload = function() {
    var recaptcha = document.forms["form"]["g-recaptcha-response"];
    recaptcha.required = true;
    recaptcha.oninvalid = function(e) {     
        alert("Please click on i am not a robot");
        }
    }
</script>

<script src="https://www.google.com/recaptcha/api.js"></script>

<div class="g-recaptcha" data-sitekey="xxx" data-callback="recaptcha"></div>

请看一下我的服务器端 php。这几天我多次尝试添加数据过期回调，但都无法成功。

$recaptcha_secret = "xxx";
        $response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$recaptcha_secret."&response=".$_POST['g-recaptcha-response']);
        $response = json_decode($response, true);
        if($response["success"] === true) {

                mail($to, $subject, $body, "From:" . $email);

        }
        else
        {

        return false;

        }
        echo 'success';
    }

Answer 1

Re-captcha 提供callback handlers 当用户选择复选框和检查令牌过期时。例如

 <div class="g-recaptcha" id="headerCaptcha" data-callback="recaptchaCallbackHeader" data-expired-callback="recaptchaExpiryHeader" data-sitekey="xxx"></div>
 // There should be expiry handler like 
function recaptchaExpiryHeader(){
    alert('You should have to check captcah again as it is expired');
}  

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