jQuery がソート関数に基づいて上に移動および下に移動する方法を実装する方法

<tr id="{sh:$vo.id}">
  <td>
    <span onclick="up(this);" class="glyphicon glyphicon-arrow-up text-danger up" style="cursor: pointer;" title="上移" aria-hidden="true"></span>
       
    <span onclick="down(this);" class="glyphicon glyphicon-arrow-down text-danger down" style="cursor: pointer;" title="下移" aria-hidden="true"></span>
  </td>
  <td>
    <span title="{sh:$vo.user_id}">{sh:$vo.store_name}</span>
  </td>
  <td class="center"><a href="{sh:$vo.logo}" target="_blank"><img  src="{sh:$vo.logo}"    style="max-width:90%"jQuery がソート関数に基づいて上に移動および下に移動する方法を実装する方法" ></td>
  <td class="center">{sh:$vo.category_name}</td>
  <td class="center edit">
    <a val="{sh:$vo.store_id}" onclick="view(this);" class="view btn btn-success" href="javascript:void(0);" title="查看">
      <i class="halflings-icon white zoom-in"></i>
    </a>
  </td>
</tr>

// 上移
function up(obj){
  var $tr = $(obj).parents("tr");
  if ($tr.index() != 0) {
    var current_id  = $tr.attr('id');
    var exchange_id  = $tr.prev("tr").attr('id');
    $.ajax({
      url: '{sh::U("Mall/ajax","todo=exchange_sort")}',
      type: 'POST',
      data: 'current_id='+current_id+'&exchange_id='+exchange_id,
      success:function(json) {
        if (json == 1) {
          $tr.fadeOut().fadeIn();
          $tr.prev().before($tr);
          layer.msg('上移成功', {icon: 1});
        } else {
          layer.msg('上移失败', {icon: 2});
        }
      }
    });
  }
}
// 下移
function down(obj) {
  var len = $(".down").length;
  var $tr = $(obj).parents("tr");
    if ($tr.index() != len - 1) {
      var current_id  = $tr.attr('id');
      var exchange_id  = $tr.next("tr").attr('id');
      $.ajax({
        url: '{sh::U("Mall/ajax","todo=exchange_sort")}',
        type: 'POST',
        data: 'current_id='+current_id+'&exchange_id='+exchange_id,
        success:function(json) {
          if (json == 1) {
            $tr.fadeOut().fadeIn();
            $tr.next().after($tr);
            layer.msg('下移成功', {icon: 1});
          } else {
            layer.msg('下移失败', {icon: 2});
          }
        }
      });
  }
}

case 'exchange_sort':
$mallShopModel = M('Mall_shop');
$current_id  = $this->_post('current_id','trim');
$exchange_id  = $this->_post('exchange_id','trim');
$current_sort = $mallShopModel->where(array('id'=>$exchange_id))->getField('sort');
$exchange_sort = $mallShopModel->where(array('id'=>$current_id))->getField('sort');
$cdata['id']  = $current_id;
$cdata['sort'] = $current_sort;
$cres     = $mallShopModel->save($cdata);
$edata['id']  = $exchange_id;
$edata['sort']  = $exchange_sort;
$eres     = $mallShopModel->save($edata);
if ($cres !== FALSE && $eres !== FALSE){
  exit('1');
} else {
  exit('2');
}