Detect browser with UA in China

browser.js

const ua = navigator.userAgent.toLowerCase();

export function isWechat() {
  return /micromessenger/i.test(ua);
}

export function isAndroid() {
  return /android/i.test(ua);
}

export function isIOS() {
  return /(ipad|iphone)/i.test(ua);
}

export function getIOSVersion() {
  const re = /(ipad|iphone); cpu (iphone )?os (\d+)/i;
  const match = re.exec(ua);
  if (match) {
    return match[3];
  }
  return null;
}

export function isMobile() {
  return /(ipad|iphone|ipod|android|webos)/i.test(ua);
}

export function isDesktop() {
  return !isMobile();
}