Jquery替换选择选项

我希望用另一组选项替换当前的选择选项，而不使用循环。我有一段代码：

<select>
<option>O1</option>
<option>O1</option>
</select>

谢谢。

试试看：

<select id='needSelect'>
  <option>O1</option>
  <option>O1</option>
</select>

$newoptions = "<option>NewO1</option>
               <option>NewO1</option>";

$('select#needSelect').html($newoptions);

试着这样做：

<select id='needSelect'>
  <option>O1</option>
  <option>O1</option>
</select>

$newoptions = "<option>NewO1</option>
               <option>NewO1</option>";

$('select#needSelect').html($newoptions);

---

非常感谢。这很有效。$'selectproducts'.html'GuitarBass'；非常感谢。这很有效。$'selectproducts'.html'GuitarBass'；

$('selectoptions[name='+Fldname+']').replaceWith(newoptions);

<select id='needSelect'>
  <option>O1</option>
  <option>O1</option>
</select>

$newoptions = "<option>NewO1</option>
               <option>NewO1</option>";

$('select#needSelect').html($newoptions);