使用Javascript提交多个PDF表单？

document.getElementById('submitBtn').addEventListener('click', function() {
  submitPDFForms();
});

function submitPDFForms() {
  var forms = document.getElementsByClassName('pdf-form');
  var formData = new FormData();

  for (var i = 0; i < forms.length; i++) {
    var form = forms[i];
    var formId = form.getAttribute('id');
    var formFields = form.getElementsByTagName('input');

    for (var j = 0; j < formFields.length; j++) {
      var field = formFields[j];
      var fieldName = field.getAttribute('name');
      var fieldValue = field.value;

      formData.append(formId + '_' + fieldName, fieldValue);
    }
  }

  var xhr = new XMLHttpRequest();
  xhr.open('POST', 'submit.php', true);
  xhr.send(formData);
}