前端跨域中，将url追加到script的src,如何拿到数据

现在项目中想通过js得到用户的当前外网IP，现有个地址返回的信息如下：
if(window.IPCallBack) {IPCallBack({"ip":"116.226.214.249","pro":"上海市","proCode":"310000","city":"上海市","cityCode":"310000","region":"浦东新区","regionCode":"310115","addr":"上海市浦东新区电信","regionNames":"","err":""});}