问使用navigator.language获取用户区域

EN

var re = /^(?:(en-GB-oed|i-ami|i-bnn|i-default|i-enochian|i-hak|i-klingon|i-lux|i-mingo|i-navajo|i-pwn|i-tao|i-tay|i-tsu|sgn-BE-FR|sgn-BE-NL|sgn-CH-DE)|(art-lojban|cel-gaulish|no-bok|no-nyn|zh-guoyu|zh-hakka|zh-min|zh-min-nan|zh-xiang))$|^((?:[a-z]{2,3}(?:(?:-[a-z]{3}){1,3})?)|[a-z]{4}|[a-z]{5,8})(?:-([a-z]{4}))?(?:-([a-z]{2}|\d{3}))?((?:-(?:[\da-z]{5,8}|\d[\da-z]{3}))*)?((?:-[\da-wy-z](?:-[\da-z]{2,8})+)*)?(-x(?:-[\da-z]{1,8})+)?$|^(x(?:-[\da-z]{1,8})+)$/i;

let foo = re.exec('de-AT');      // German in Austria
let bar = re.exec('zh-Hans-CN'); // Simplified Chinese using Simplified script in mainland China

console.log(`region ${foo[5]}`); // 'region AT'
console.log(`region ${bar[5]}`); // 'region CN'

> navigator.language
< "de"

$.get("http://ip-api.com/json", function(response) {
  console.log(response.country);     // "United States"
  console.log(response.countryCode); // "US"
}, "jsonp");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

const { region } = new Intl.Locale('sr-Latn-RS') // region => 'RS'