Bootstrap 4 引导reCAPTCHA客户端验证

我正在尝试使用引导验证检查客户端的reCAPTCHA，但这不起作用。有什么想法吗

var validation = Array.prototype.filter.call(forms, function(form) {
            form.addEventListener('submit', function(event) {
                // CAPTCHA VALIDATION
                var response = grecaptcha.getResponse();

                if(response.length == 0){
                     event.preventDefault();
                     event.stopPropagation();
                     document.querySelector('.g-recaptcha>div').classList.add('border', 'border-danger')
                     document.getElementById('cap-inv').style.display='block';//Shows error message

                 } 
                 
                
              if (form.checkValidity() === false ) {
                event.preventDefault();
                event.stopPropagation();
              }
              form.classList.add('was-validated');
            }, false);
          });