未执行的Ajax请求返回未定义

我正在设计一个在线多项选择测试，所以用户选择3个答案(单选按钮)中的一个，然后提交他/她的答案。一旦提交按钮被按下，我需要计算的结果，我使用AJAX请求来比较每个答案分别使用一个PHP脚本检索问题一个接一个以及基于AJAX请求参数。

这是我的AJAX请求:

function calculateResults(){
  totalPoints = 0;
  var qNum = 10;
  while(qNum != 0){
  $.ajax({
      method : "GET",
      url: "php-scripts/testing-questions.php",
      data: {queNum : qNum},
      success: function(data){
          console.log(data);
          //check if radio1 value is set
          if(document.getElementById('r1q' + qNum).check == true){
            var answer = document.getElementById('r1q' + qNum).value;
          }
          //check if radio2 value is set
          else if(document.getElementById('r2q' + qNum).check == true){
            var answer = document.getElementById('r2q' + qNum).value;
          }
          else{ //radio 3 value is set then
             var answer = document.getElementById('r3q' + qNum).value;
          }
          if(data === answer){
              totalPoints++;
          }
        }
     });
     qNum--;
  }

}

这是我的PHP脚本

if(isset($_GET['queNum'])){
    $qNum = $_GET['queNum'];
    getAnswer($qNum);
      function getAnswer($num){
          $query = mysqli_query($conn, "SELECT correctAnswer
                              FROM  `Testing` 
                              WHERE  `questionNum` = '".$queNum."' ");
          $row = mysqli_fetch_array($query,MYSQLI_ASSOC);
          echo $row;
          $correA = $row['correctAnswer'];
          echo $correA;
      }
}

请注意，$conn变量是从config.php文件中设置的，您可以正确地假设与数据库的连接工作正常，并且函数中的echo语句是出于调试原因而存在的，您也应该假设SQL查询运行良好。

我一直在努力找到这是什么错了超过一天，它看起来很简单，但我不能让它工作，没有其他例子在这里或其他任何地方关于AJAX退出未定义。如果有经验的人能帮上忙，我将不胜感激。

按要求的HTML代码如下:

 <div class="container3">
<div id="startTest">
  <center><button class="checkButtons" onClick="startTimer()" style="width:100px;"> Start Test</button></center>
</div>
<div id="beginTest">
 <input type = "text" name="timer" width="30%" id="timer" value ="10:00" readonly>
</div>
<div id="questions">
 <center>
  <div class="question">
    <p class="q">Question 1: <?php echo $question1 ?></p>
    <input type="radio" id="r1q1" name="answerswer1" value="Answer 1" checked>Answer A: <?php echo $answerA1 ?> <br>
    <input type="radio" id="r2q1" name="answerswer1" value="Answer 2">Answer B: <?php echo $answerB1 ?> <br>
    <input type="radio" id="r3q1" name="answerswer1" value="Answer 3">Answer C: <?php echo $answerC1 ?> <br>
  </div>
   <div class="question">
    <p class="q">Question 2: <?php echo $question2 ?></p>
    <input type="radio" id="r1q2" name="answerswer2" value="Answer 1" checked>Answer A: <?php echo $answerA2 ?> <br>
    <input type="radio" id="r2q2" name="answerswer2" value="Answer 2">Answer B: <?php echo $answerB2 ?> <br>
    <input type="radio" id="r3q2" name="answerswer2" value="Answer 3">Answer C: <?php echo $answerC2 ?> <br>
  </div>
   <div class="question">
    <p>Question 3: <?php echo $question3 ?></p>
    <input type="radio" id="r1q3" name="answerswer3" value="Answer 1" checked>Answer A: <?php echo $answerA3 ?> <br>
    <input type="radio" id="r2q3" name="answerswer3" value="Answer 2">Answer B: <?php echo $answerB3 ?> <br>
    <input type="radio" id="r3q3" name="answerswer3" value="Answer 3">Answer C: <?php echo $answerC3 ?> <br>
  </div>
  <div class="question">
  <p class="q">Question 4: <?php echo $question4 ?></p>
    <input type="radio" id="r1q4" name="answerswer4" value="Answer 1" checked>Answer A: <?php echo $answerA4 ?> <br>
    <input type="radio" id="r2q4" name="answerswer4" value="Answer 2">Answer B: <?php echo $answerB4 ?> <br>
    <input type="radio" id="r3q4" name="answerswer4" value="Answer 3">Answer C: <?php echo $answerC4 ?> <br>
  </div>
   <div class="question">
    <p class="q">Question 5: <?php echo $question5 ?></p>
    <input type="radio" id="r1q5" name="answerswer5" value="Answer 1" checked>Answer A: <?php echo $answerA5 ?> <br>
    <input type="radio" id="r2q5" name="answerswer5" value="Answer 2">Answer B: <?php echo $answerB5 ?> <br>
    <input type="radio" id="r3q5" name="answerswer5" value="Answer 3">Answer C: <?php echo $answerC5 ?> <br>
  </div>
   <div class="question">
   <p class="q">Question 6: <?php echo $question6 ?></p>
    <input type="radio" id="r1q6" name="answerswer6" value="Answer 1" checked>Answer A: <?php echo $answerA6 ?> <br>
    <input type="radio" id="r2q6" name="answerswer6" value="Answer 2">Answer B: <?php echo $answerB6 ?> <br>
    <input type="radio" id="r3q6" name="answerswer6" value="Answer 3">Answer C: <?php echo $answerC6 ?> <br>
  </div>
   <div class="question">
    <p class="q">Question 7: <?php echo $question7 ?></p>
    <input type="radio" id="r1q7" name="answerswer7" value="Answer 1" checked>Answer A: <?php echo $answerA7 ?> <br>
    <input type="radio" id="r2q7" name="answerswer7" value="Answer 2">Answer B: <?php echo $answerB7 ?> <br>
    <input type="radio" id="r3q7" name="answerswer7" value="Answer 3">Answer C: <?php echo $answerC7 ?> <br>
  </div>
   <div class="question">
   <p class="q">Question 8: <?php echo $question8 ?></p>
    <input type="radio" id="r1q8" name="answerswer8" value="Answer 1" checked>Answer A: <?php echo $answerA8 ?> <br>
    <input type="radio" id="r2q8" name="answerswer8" value="Answer 2">Answer B: <?php echo $answerB8 ?> <br>
    <input type="radio" id="r3q8" name="answerswer8" value="Answer 3">Answer C: <?php echo $answerC8 ?> <br>
  </div>
   <div class="question">
   <p class="q">Question 9: <?php echo $question9 ?></p>
    <input type="radio" id="r1q9" name="answerswer9" value="Answer 1" checked>Answer A: <?php echo $answerA9 ?> <br>
    <input type="radio" id="r2q9" name="answerswer9" value="Answer 2">Answer B: <?php echo $answerB9 ?> <br>
    <input type="radio" id="r3q9" name="answerswer9" value="Answer 3">Answer C: <?php echo $answerC9 ?> <br>
  </div>
   <div class="question">
    <p class="q">Question 10: <?php echo $question10 ?></p>
    <input type="radio" id="r1q10" name="answerswer10" value="Answer 1" checked>Answer A: <?php echo $answerA10 ?> <br>
    <input type="radio" id="r2q10" name="answerswer10" value="Answer 2">Answer B: <?php echo $answerB10 ?> <br>
    <input type="radio" id="r3q10" name="answerswer10" value="Answer 3">Answer C: <?php echo $answerC10 ?> <br>
  </div>
    <button class="checkButtons" onClick="calculateResults()" style="width:100px;"> Submit Answers</button>
</center>
</div>