AJAX接收ID

Question

我是AJAX和javascript的新手，但我正在尝试编写一些代码来删除表中的记录。这是我的代码：

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$(".deletebutton").click(function(){
    var record = $(this);
    var del_id = record.attr("id");
    var rec = 'id=' + del_id;
    if(confirm("Are you sure you want to delete this Record?")){
    $.ajax({
        type: "POST",
        url: "k.php",
        data: rec,
        success: function(){
        }
    });
        $(this).parents(".record").animate({ backgroundColor: "#fbc7c7" }, "fast")
        .animate({ opacity: "hide" }, "slow");
    }
    return false;
});

}）;

这里是php代码，它为行提供了一个id

        echo '<td><div align = "left"><a href ="#" id="'.$row['id'].'" class = "deletebutton" title = "Delete">delete</a></div></td>';

由于某些原因，当我在javascript中打印出记录和del_id时，它们都是未定义的。