<script>
$('#checklist-builder .add-row').click(function(){
    var new_row = $('#checklist-builder>tfoot>tr').clone();
    $('#checklist-builder>tbody').append(new_row);
});
</script>

克隆行是：

<tr>
  <td>${j}</td>
  <td>
    <input size="2" type="hidden" value="" name="WhoChecklistField[1][${j}][id]" id="WhoChecklistField_1_${j}_id">      <input size="2" maxlength="2" type="text" value="" name="WhoChecklistField[1][${j}][weight]" id="WhoChecklistField_1_${j}_weight">    </td>
  <td>
    <input type="text" value="" name="WhoChecklistField[1][${j}][name]" id="WhoChecklistField_1_${j}_name">    </td>
  <td>
    <select size="1" name="WhoChecklistField[1][${j}][type]" id="WhoChecklistField_1_${j}_type">
      <option value="text">Text field</option>
      <option value="select">Select field</option>
      <option value="radio">Radio field</option>
      <option value="checkBox">CheckBox field</option>
    </select>
  </td>
</tr>

现在我想用表大小为1替换${j},如何在jquery克隆字符串中替换${j}？