browser.js

class Browser {
  static nameAndVersion() {
    // http://stackoverflow.com/questions/5916900/how-can-you-detect-the-version-of-a-browser
    var ua= navigator.userAgent, tem,
    M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
    if (/trident/i.test(M[1])) {
      tem=  /\brv[ :]+(\d+)/g.exec(ua) || [];
      return 'IE '+(tem[1] || '');
    }
    if (M[1]=== 'Chrome') {
      tem= ua.match(/\b(OPR|Edge)\/(\d+)/);
      if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera');
    }
    M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
    if((tem= ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]);
    return M.join(' ');
  }

  static isMobile() {
    return (('ontouchstart' in window) || (navigator.maxTouchPoints > 0) || (navigator.msMaxTouchPoints > 0));
  }

  static userAgent() {
    return window.navigator.userAgent;
  }
}