通过淘宝接口根据 IP 获取省市信息

特点：调用简单，返回字符串，好使靠谱

调用地址：
http://ip.taobao.com/service/getIpInfo.php?ip=119.75.218.70　　　　　　　　
只需要更改 ip 即可。

返回值：JSON 字符串

{
    code: 0,
    data: {
        country: "中国",
        country_id: "CN",
        area: "华北",
        area_id: "100000",
        region: "北京市",
        region_id: "110000",
        city: "北京市",
        city_id: "110100",
        county: "",
        county_id: "-1",
        isp: "百度网络",
        isp_id: "100099",
        ip: "119.75.218.70"
    }
}