yige.org 试一个

<html>
<head>
<script type="text/javascript">
function removeLastOption()
  {
  var x=document.getElementById("mySelect")
  if (x.length>0)
    {
    x.remove(x.length-1);
    }
  }
</script>
</head>
<body>

<form>
<select id="mySelect">
  <option>Apple</option>
  <option>Pear</option>
  <option>Banana</option>
  <option>Orange</option>
</select>
<input type="button" onclick="removeLastOption()" value="Remove last option">
</form>

</body>
</html>

结果:

编辑上面的代码，点击查看结果。

yige.org - 试一个