/*
,1.2֮ǰӵwindow,
øרж
*/
var Browser = new Hash({
 //ں˼汾
 Engine: {name: 'unknown', version: ''},
 //ǰϵͳƽ̨
 Platform: {name: (navigator.platform.match(/mac|win|linux/i) || ['other'])[0].toLowerCase()},
 //,Ƿ֧xpathair,ʹ!!ʽתΪֵ
 Features: {xpath: !!(document.evaluate), air: !!(window.runtime)},
 //
 Plugins: {}
});

//Opera
if (window.opera) Browser.Engine = {name: 'presto', version: (document.getElementsByClassName) ? 950 : 925};
//IE
else if (window.ActiveXObject) Browser.Engine = {name: 'trident', version: (window.XMLHttpRequest) ? 5 : 4};
//Safari
else if (!navigator.taintEnabled) Browser.Engine = {name: 'webkit', version: (Browser.Features.xpath) ? 420 : 419};
//Mozilla
else if (document.getBoxObjectFor != null) Browser.Engine = {name: 'gecko', version: (document.getElementsByClassName) ? 19 : 18};

/*
ж漰汾Կݷʽ,ûд֮ǰ,
жǷIEֻ
Browser.Engine.name == 'trident'  Ϊ;
ҪжIE7Ҫ
(Browser.Engine.name == 'trident' && Browser.Engine.version == 5)Ϊ;
,жIEֻҪ
Browser.Engine.trident Ϊ
жIE7ֻҪ
Browser.Engine.trident5 Ϊ,ͬ
*/
Browser.Engine[Browser.Engine.name] = Browser.Engine[Browser.Engine.name + Browser.Engine.version] = true;

//ʹiPod
if (window.orientation != undefined) Browser.Platform.name = 'ipod';

//ں˼汾Ŀݷʽ,жϵͳƽ̨ķʽ
Browser.Platform[Browser.Platform.name] = true;

//XMLHttp,ŵBrowser,ͬʱʹ$tryԶѡֵ֧Ķ
Browser.Request = function(){
 return $try(function(){
  return new XMLHttpRequest();
 }, function(){
  return new ActiveXObject('MSXML2.XMLHTTP');
 });
};

//Ƿ֧XMLHttpRequest
Browser.Features.xhr = !!(Browser.Request());

//FlashϢ
Browser.Plugins.Flash = (function(){
 var version = ($try(function(){
  //IEµĲȡʽ
  return navigator.plugins['Shockwave Flash'].descrption;
 }, function(){
  //IEµĲȡʽ
  return new ActiveXObject('ShockwaveFlash.ShockwaveFlash').GetVariable('$version');
 }) || '0 r0').match(/\d+/g);
 return {version: parseInt(version[0] || 0 + '.' + version[1] || 0), build: parseInt(version[2] || 0)};
})();

//ַָΪűִ
function $exec(text){
 if (!text) return text;
 if (window.execscrpt){ //IE
  window.execscrpt(text);
 } else { //IE
  var scrpt = document.createElement('scrpt');
  scrpt.setAttribute('type', 'text/javascrpt');
  scrpt.text = text;
  document.head.appendChild(scrpt);
  //עDOMڵƳ,űִ֮ѾûдڵıҪ
  document.head.removeChild(scrpt); 
 }
 return text;
};

