当我单击删除按钮时查询未运行，即使 .success 说它有效

我制作了一个模型，当我从切换菜单中单击删除时调用该模型。然后，它给出了一个数据列表，我可以通过单击它们旁边的按钮来删除这些数据。但是由于某种原因，我无法弄清楚页面何时重新加载，没有删除任何内容。我在javascript中成功后添加了一个警报"成功"。将调用此警报，但不会删除数据。引导和jQuery链接在索引页中，它们都工作得很好。这个问题令人目瞪口呆，如果有人能对此有所了解，我将不胜感激。

这是 html：

<div class="modal fade" id="delete_comment" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="form-horizontal" role="form">
        <div class="modal-header">
          <h4>Delete comments</h4>
        </div>
        <div class="modal-body">
          <?php $comment_array = comments::get_comments($username); ?>
          <?php if(isset($comment_array) && is_array($comment_array)): ?>
          <?php
            foreach ($comment_array as $key => $comment):
            foreach($comment as $key2 => $comment2):
            $max = count($comment_array);
            $i=1;
            while($i<=$max):
          ?>
          <?php
            $comment_id = $comment2->id;
            $comment_name = $comment2->comment_name;
            $comment_type = $comment2->comment_type;
          ?>
          <form class="comment_delete_area_wrapper" action="" method="post">
            <div class="comment_delete_wrapper">
              <ul>
                <li class="comment_delete_comments">
                  <?php echo $comment_type ?> : <?php echo $comment_name; ?>
                </li>
              </ul>
              <div class="comment_delete_button_wrapper">
                <input type="submit" id="<?php echo $comment_id; ?>"
                       class="btn btn-danger comment_delete_button" value="Delete"/>
              </div>
              <br>
              <hr>
              <input type="hidden" value="<?php echo $comment_id; ?>"
                     id="comment_delete_id" name="comment_delete_name"/>
            </div>
          </form>
          <?php $i++; ?>
          <?php endwhile;?>
          <?php endforeach; ?>
          <?php endforeach;?>
          <?php endif; ?>
        </div>
        <div class="modal-footer">
          <a class="btn btn-default" data-dismiss="modal">Close</a>
        </div>
      </div>
    </div>
  </div>
</div>

这是类的PHP代码。注释都来自数据库，完美且看起来很完美。问题是删除它们。

<?php
class Comments{
    public static function delete($cl_id)
{

    $db = new PDO('mysql:host=localhost;dbname=comment;charset=utf8', 'root', '');
    $stmt = $db->prepare("DELETE FROM `comments` WHERE id = :cl_id");
    $stmt->bindParam(':cl_id', $cl_id);
    if ($stmt->execute()) {
        return true;
    } else {
        return null;
    }
}
}

还有javascript：

$(document).ready(function(){
add_delete_handlers();
});
function add_delete_handlers(){
$('.comment_delete_button').each(function(){
    var btn = this;
    $(btn).click(function(){
        comment_delete(btn.id);
    });
});
}
function comment_delete(_comment_id){
$.post('comment_area_ajax/comment_delete.php', {
        task: 'comment_delete',
        comment_id: _comment_id
    }
).success(function(data){
        alert('Success');
        $('#_' + _comment_id).detach();
    });
 }

最后是 AJAX 要调用的代码：

<?php
if(isset($_POST['task']) && $_POST['task'] =='comment_delete') {
require_once '../comment_area_sql/models/comment_delete_model.php';
require_once '../comment_area_sql/models/comments.php';
    if(class_exists('Comments')){
          if(Comments::delete($_POST['comment_id'])){
                echo 'true';
}else{
                echo 'false';
}
?>