jquery Nestable 获取改变排序后的json数据 拖动排序

<script type="text/javascript">
			jQuery(function($){
				$('.dd').nestable();
				$('.dd-handle a').on('mousedown', function(e){
					e.stopPropagation();
				});
				$('[data-rel="tooltip"]').tooltip();
				 $('#nestable').nestable().on('change', function(){ 
					 var r = $('.dd').nestable('serialize'); 
					 $("#xx").html(JSON.stringify(r));	//改变排序之后的数据
				});
				 $('#nestable').nestable().on('change', updateOutput);
			});
		</script>

　　以上代码用来获取操作后的json 数据，传递给后台，进行数据排序处理。

以下为我的操作：

<script type="text/javascript">
	jQuery(function($){
		var courseID = '{$course_id}';
		$('.dd').nestable();
		$('.dd-handle a').on('mousedown', function(e){
			e.stopPropagation();
		});
		$('[data-rel="tooltip"]').tooltip();
		$('#nestable').nestable().on('change', function(){
			var r = $('.dd').nestable('serialize');

			console.log(11);
			console.log(JSON.stringify(r));
			$.ajax({
				type: 'POST',
				url: "__URL__/updateSort",
				data: {jsonData:JSON.stringify(r),courseId:courseID},
				success:function(result){
					//console.log(result);
					window.location.reload();
				}});
			$("#xx").html(JSON.stringify(r));	//改变排序之后的数据
		});
		$('#nestable').nestable().on('change', updateOutput);
	});
</script>

　　

    public function updateSort(){
        //$data = '[{"id":605,"children":[{"id":4093},{"id":4095},{"id":4094},{"id":4096},{"id":4097},{"id":4098},{"id":4099},{"id":4100},{"id":4101},{"id":4102},{"id":4103},{"id":4104},{"id":4105},{"id":4106},{"id":4107},{"id":4108},{"id":4109},{"id":4110},{"id":4111},{"id":4112}]}]';
        $data = $_POST['jsonData'];
        //$data = '[{"id":553,"children":[{"id":3769},{"id":3768},{"id":3770},{"id":3771},{"id":3772},{"id":3773},{"id":3774},{"id":3775},{"id":3776},{"id":3777},{"id":3778}]}]';
        $data = json_decode($data);
        //var_dump($data);
        $courseId = $_POST['courseId'];
        //$courseId = 343;
        $chapterId = $data[0]->id;
        //$chapterId = 553;
        $childrenData = $data[0]->children;

        try{
            foreach($childrenData as $key=>$item){
                echo $item->id."--".$key."<br/>";
                M('CourseChapterSection')->where(array('course_id'=>$courseId,'chapter_id'=>$chapterId,'section_id'=>$item->id))->data(array('s_sort'=>$key))->save();
            }
            echo 1;
        }catch(Exception $e){
            echo 0;
        }
    }