对select中数据的调用操作

<script language="javascript">

function appear(){

var s=document.all.select

var t=s.options[s.options.selectedIndex].text

var v=s.options[s.options.selectedIndex].value

var i=0;

var x,y;

x=v.substring(0,v.indexOf(","));

y=v.substring(v.indexOf(",")+1,v.length);

alert(x);

alert(y);

}

</script>

<select size="10" onDBlClick="appear();" name="select">

<option value="100,200">11</option>

<option value="2,4">22</option>

</select>