如何删除下拉列表中的一项?

Question

<script language="javascript">
function del()
{ 
  document.all.s1.remove(document.all.partUser.selectedIndex);
}
</script>
<select name="s1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<input type="button" onclick="del()" value="delOption">

Answer 1

上面的partUser因該是s1了主要是用到了remove
增加一個節點是:
o=document.createElement("OPTION");
o.text=""
o.value=""
document.all.s1.add(o);

Answer 2

<script language="javascript">
function del()
{ 
  with(document.all.s1)if(selectedIndex>=0)options[selectedIndex].removeNode(true);
}
</script>
<select name="s1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<input type="button" onclick="del()" value="delOption">