浏览器平台和语言检测

var BROWSER = {
      V: function(){
        var u = navigator.userAgent;
        var app = navigator.appVersion;
        return {
          IE:u. indexOf('Trident') > -1,
          OPERA: u.indexOf('Presto') > -1,
          WEBKIT: u.indexOf('AppleWebKit') > -1,
          FIREFOX: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,
          MOBILE: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/),
          IOS: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/),
          ANDROID: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,
          IPHONE: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1,
          IPAD: u.indexOf('iPad') > -1
        };
      }(),
      LANG: (navigator.browserLanguage || navigator.language).toLowerCase()
    }