JavaScript检测访问网站IP地址来自哪些地市

<span style="color:#000000;"><!--<span style="color:#000000;">先导入新浪提供的检测IP的JS</span>--><script src="http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=" type="text/javascript" language="javascript"></script> </span><span style="color:#000000;"></span><span style="color:#000000;"><script type="text/javascript" src="http://counter.sina.com.cn/ip/" charset="gb2312"></script> </span><script language="javascript">        //判断IP来自北京   if(remote_ip_info.city == "北京"){      }</script>