指定删除上拉框某个值

指定删除下拉框某个值
<select id="list" style="width:200px">

<option value="1">1</option>

<option value="2">2</option>

<option value="3">3</option>

</select>



<script>
var a = document.getElementById("list");
for(var i=0;i<a.length; i++){
if(i==1){
a.remove(i);
}
}
</script>