<!DOCTYPE html>
<html>
<head>
<title>135</title>
<meta charset="utf-8">
<script type="text/javascript">
function ac()
{
var oa=document.getElementById("aa");
alert(aa.value);
}
</script>
</head>
<body>
<select id="aa">
<option value="11">11</option>
<option value="22">22</option>
<option value="33">33</option>
<option value="44">44</option>
<option value="55">55</option>
</select>
<input type="button" id="ss" onclick="ac()" value="hhhhhh">
</body>
</html>