2019-09-06 jsonp

通过响应的文本执行函数handleResponse

//jsonp的回调函数
function handleResponse(response){
  alert("You’ re at IP address " + response.ip + ", which is in " +
  response.city + ", " + response.region_name);
}

var script = document.createElement("script");
script.src = "http://freegeoip.net/json/?callback=handleResponse";
document.body.insertBefore(script, document.body.firstChild);