<html>
<head>

<style>
<!--

.cls1 {
}{ position:absolute; left:250px; top:89px; width:216px; height:72px; z-index:1; }

.cls2 {
}{ position:absolute; left:250px; top:89px; width:95px; height:18px; z-index:2 }

input {
}{ font-size: 12px; padding-top: 2px; padding-left: 2px;width:127;}
//-->
</style>
</head>

<script>
<!--

function addOption(pos)
{

if(event.keyCode==13)

{
var select_obj = document.getElementById("myselect");
var text_value = document.getElementById("test").value;

if (select_obj.length)

{
for (var i=0;i<select_obj.length;i++)

{
// 如果已经存在,不添加,直接退出
if (select_obj.options[i].text==text_value)
alert("选项已存在,请重新输入");
}
}
var the_option= new Option(text_value,text_value);
select_obj.add(the_option);

select_obj.selectedIndex = select_obj.options.length-1
}
}
//-->
</script>
<div class="cls1" style="clip: rect(3 280 21 110)">
<select name="myselect" style="width:127" onchange="document.getElementById('test').value=this.value">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
</div>
<div class="cls2">
<input type="text" name="test" onkeydown="addOption()" size="20" style="width: 127; height: 23">
</div>

</body>
</html>



































































