<table id="table">
  <thead>
  <tr>
    <th><a href="#" data-sort-by="A">Column A</a></th>
    <th><a href="#" data-sort-by="B">Column B</a></th>
    <th><a href="#" data-sort-by="C">Column C</a></th>
    <th>Column D</th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <td>a</td><td>b</td><td>c</td><td>d</td>
  </tr>
  <tr>
    <td>a</td><td>b</td><td>c</td><td>d</td>
  </tr>
  </tbody>
</table>

<script>
  $(function() {
    $("#table").semiAutoTable({
      rowOption: false,
      pageOption: false,
      sortOption: {
        'A': 'asc',
        'B': 'desc'
      }
    }).on('sortChange', function(event, sortObject) {

      console.log(JSON.stringify(sortObject));
      $(this).semiAutoTable('updateSortBy', sortObject);

    });

  });
</script>