부트 스트랩이 활성 클래스를 호출하지 않는 이유는 무엇입니까?

jQuery Ajax를 통해 PHP 파일에서 정보를 받고 아래와 같이 정보를 반복합니다. a를 호출하고 부트 스트랩이 제공 <tr class="active">하는 <tr><td>형식에 넣을 필요가 있습니다 . 그러나 불행히도 이것은 일어나지 않습니다.

누구에게 제안이 있습니까? 감사합니다 :)

function getStudentList() {
     $.ajax({    //create an ajax request to load_page.php
       type: "GET",
       url: "getView.php",             
       dataType: "json",   //expect html to be returned                
       success: function(response){                    
          $.each(response, function(index, response){

          $( "#aaa" ).append('<tr class="active"><td>' + response['Student_ID'] + '</td><td>' + response['FirstName'] + "</td><td>" + response['LastName'] + "</td><td>" + response['Student_ID'] + "</td><td>" + response['Year'] + '</td></tr>');
        });

    },
     error: function(e) {
        //called when there is an error
        console.log("Error: " + e.message);
        }
    });
}

---------- HEADER.PHP ---------------

  <!-- Database Config Files -->
<?php include('db_config.php'); ?>

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">


<!-- Custom css -->
<link rel="stylesheet" type="text/css" href="style.css">

<!-- Latest compiled and minified JavaScript -->

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

<script type="text/javascript" src="export.js"></script>
<script type="text/javascript" src="contact.js"></script>
<script type="text/javascript" src="view.js"></script>
<script type="text/javascript" src="create.js"></script>
<script type="text/javascript" src="edit.js"></script>
<script type="text/javascript" src="delete.js"></script>
<script type="text/javascript" src="search.js"></script>