script.js

document.addEventListener('DOMContentLoaded', () => {

  const ajaxSend = async (formData) => {
      const fetchResp = await fetch('mail.php', {
          method: 'POST',
          body: formData
      });
      if (!fetchResp.ok) {
          throw new Error(`Ошибка по адресу ${url}, статус ошибки ${fetchResp.status}`);
      }
      return await fetchResp.text();
  };

  const forms = document.querySelectorAll('form');
  forms.forEach(form => {
      form.addEventListener('submit', function (e) {
          e.preventDefault();
          const formData = new FormData(this);

          ajaxSend(formData)
              .then((response) => {
                  console.log(response);
                  form.reset(); // очищаем поля формы 
              })
              .catch((err) => console.error(err))
      });
  });

});