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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<select id="test" onkeydown="return key_down(this.id)">
<option value="0">请选择</option>
<option value="1">1111</option>
<option value="2">2222</option>
<option value="3">3333</option>
</select>
</body>
</html>
<script language="javascript">
document.getElementById("test").focus();
function key_down(obj){
alert(obj)
var test = document.getElementById(obj);
var txt = test.options[test.selectedIndex].innerHTML;
alert("您选则了"+txt);
}
</script>