根据用户IP地址查询用户信息

调用新浪接口：

http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=116.24.141.113

还回数据

{"ret":1,"start":"116.24.0.0","end":"116.25.255.255","country":"\u4e2d\u56fd","province":"\u5e7f\u4e1c","city":"\u6df1\u5733","district":"","isp":"\u7535\u4fe1","type":"","desc":""}