如何在jQuery的遗留Datatable排序中修改“asc”"desc“模式

<table id="myTable">
  <thead>
    <tr>
      <th>列1</th>
      <th>列2</th>
      <th>列3</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>数据1</td>
      <td>数据2</td>
      <td>数据3</td>
    </tr>
    <!-- 其他行数据 -->
  </tbody>
</table>

$(document).ready(function() {
  $('#myTable').DataTable({
    "ordering": true,
    "order": [[ 0, "asc" ]] // 默认按第一列升序排序
  });
});

$.fn.dataTableExt.oSort['asc-string-strict'] = function(x, y) {
  return ((x < y) ? -1 : ((x > y) ? 1 : 0));
};

$.fn.dataTableExt.oSort['desc-string-strict'] = function(x, y) {
  return ((x < y) ? 1 : ((x > y) ? -1 : 0));
};

var table = $('#myTable').DataTable();
table.draw();