PHP邮件脚本在ajax调用和表单提交后未完成

我试图在使用AJAX提交表单后调用php脚本。 PHP脚本被调用但除此之外没有任何事情发生，没有收到电子邮件，没有错误消息等。但是如果通过URL直接访问php文件并且success属性确实正确执行表单重置，它将重定向到主页。 TIA！

HTML：

  
  First Name
 
  Last Name
 
  E-Mail
 
 
 
 
  

JavaScript的：

  $("#submit").on('click', function(){ var fileName = document.location.pathname.match(/[^/]+$/), firstName = $('#first-name').val(), lastName = $('#last-name').val(), emailVal = $('#email').val(), comments = $('#comment').val(); $.ajax({ type: 'POST', url: '../script/mail.php', data: {fname:firstName, lname:lastName, email:emailVal, comment:comments, fileName:fileName}, success: function(){ $('form').each(function() { this.reset(); }); } }); }); 

PHP：*编辑：删除validation用于测试目的，这仍然不起作用。

 <?php $webmaster_email = "[e-mail]"; $index = "http://mydomain.com"; $email_address = $_POST['email']; $comments = $_POST['comment']; $fname = $_POST['fname']; $lname = $_POST['lname']; echo "$email_address"; echo "$comments"; echo "$fname"; echo "$lname"; /*function isInjected($str) { $injections = array('(\n+)', '(\r+)', '(\t+)', '(%0A+)', '(%0D+)', '(%08+)', '(%09+)' ); $inject = join('|', $injections); $inject = "/$inject/i"; if(preg_match($inject,$str)) { return true; } else { return false; } }*/ if (!isset($_REQUEST['email'])) { header("Location: $index"); exit; } elseif (empty($email_address) || empty($comments) || empty($fname)) { echo "alert('Please fill in the required fields.');"; exit; } // If email injection is detected, redirect to the error page. elseif (isInjected($email_address)){ echo "alert('Please, Try Again.')"; exit; } // If we passed all previous tests, send the email then redirect to the thank you page. else { mail("$webmaster_email", "Feedback Form Results", $comments, "From: $email_address"); echo "alert('Thank You for contacting us!')"; exit; } ?>