根据ip查询经纬度的接口

http://ip-api.com/json/

直接访问，结果如下

// 20180804140751
// http://ip-api.com/json/

{
  "as": "AS14061 DigitalOcean, LLC",
  "city": "London",
  "country": "United Kingdom",
  "countryCode": "GB",
  "isp": "Digital Ocean",
  "lat": 51.5142,
  "lon": -0.0931,
  "org": "Digital Ocean",
  "query": "138.68.149.194",
  "region": "ENG",
  "regionName": "England",
  "status": "success",
  "timezone": "Europe/London",
  "zip": "EC2V"
}