js获取当前城市名

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <div id="sina_ip_info"></div>
    <script src="http://code.jquery.com/jquery-1.7.2.min.js" type="text/javascript"></script>
    <script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
    <script type="text/javascript">
        var uip = returnCitySN["cip"].toString();
        $.getScript('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' + uip, function (_result) {
            var ipData = ""; //初始化保存内容变量
            if (remote_ip_info.ret == '1') {
                ipData += "IP 详细信息：<br>";
                ipData += "IP：" + uip + "<br>";
                ipData += "国家：" + remote_ip_info.country + "<br>";
                ipData += "省份：" + remote_ip_info.province + "<br>";
                ipData += "城市：" + remote_ip_info.city + "<br>";
                ipData += "区：" + remote_ip_info.district + "<br>";
                ipData += "ISP：" + remote_ip_info.isp + "<br>";
                ipData += "类型：" + remote_ip_info.type + "<br>";
                ipData += "其他：" + remote_ip_info.desc + "<br>";
                $("#sina_ip_info").html(ipData); //显示处理后的数据
            } else {
                alert('错误', '没有找到匹配的 IP 地址信息！');
            }
        });
    </script>
</body>
</html>