js自动根据访问者的IP获取所在地名（基于sina提供的IP库）

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<script language="javascript" type="text/javascript" 

src="http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js"></script>
<script type="text/javascript">
document.title = remote_ip_info.city + "开发库";
document.getElementById("botcity").innerHTML=remote_ip_info.city;
</script>