主页面：
<head>
<script src="../jquery-2.2.3.min.js"></script>
</head>
<body>
<select id="sel"></select>
</body>
<script type="text/javascript">
$(document).ready(function(e) {
$.ajax({
url:"chulixml.php",
dataType:"XML",
success:function(data){
var ch = $(data).find("nation").children();
var str = "";
for(var i=0;i<ch.length;i++)
{
var code = $(ch[i]).find("code").text();
var name = $(ch[i]).find("name").text();
str+="<option value=‘"+code+"‘>"+name+"</option>";
}
$("#sel").html(str);
}
});
});
</script>
处理页面;
<?php
include("../DBDA.php");
$db = new DBDA();
$sql = "select * from Nation";
$attr = $db->Query($sql);
echo "<nation>";
foreach($attr as $k=>$v)
{
echo "<shuju{$k}>";
echo "<code>{$v[0]}</code>";
echo "<name>{$v[1]}</name>";
echo "</shuju{$k}>";
}
echo "</nation>";
原文：http://www.cnblogs.com/dianfu123/p/5528142.html