text: /**
   * 
   * @desc 获取操作系统类型
   * @return {String} 
   */
  function getOS() {
      var userAgent = 'navigator' in window && 'userAgent' in navigator && navigator.userAgent.toLowerCase() || '';
      var vendor = 'navigator' in window && 'vendor' in navigator && navigator.vendor.toLowerCase() || '';
      var appVersion = 'navigator' in window && 'appVersion' in navigator && navigator.appVersion.toLowerCase() || '';
  
      if (/mac/i.test(appVersion)) return 'MacOSX'
      if (/win/i.test(appVersion)) return 'windows'
      if (/linux/i.test(appVersion)) return 'linux'
      if (/iphone/i.test(userAgent) || /ipad/i.test(userAgent) || /ipod/i.test(userAgent)) 'ios'
      if (/android/i.test(userAgent)) return 'android'
      if (/win/i.test(appVersion) && /phone/i.test(userAgent)) return 'windowsPhone'
  }
  
  module.exports = getOS;