//以用户代理字符串检测脚本，包括检测呈现引擎、平台、Windows操作系统、移动设备和游戏系统。
 var client = function(){
	//呈现引擎
	var engine = {
		ie:0,
		gecko:0,
		webkit:0,
		khtml:0,
		opera:0,
		//完整的版本号
		ver:null
	};
	
	//浏览器
	var browser = {
		//主要浏览器
		ie:0,
		firefox:0,
		safari:0,
		konq:0,
		opera:0,
		chrome:0,
		//具体的版本号
		ver:null
	};
	
	//平台、设备和操作系统
	var system = {
		win:false,
		mac:false,
		x11:false,
		//移动设备
		iphone:false,
		ipod:false,
		ipad:false,
		ios:false,
		android:false,
		nokiaN:false,
		winMobile:false,
		//游戏系统
		wii:false,
		ps:false
	};
	
	//检测呈现引擎和浏览器
	var ua = navigator.userAgent;
	if(window.opera){
		engine.ver = browser.ver = window.opera.version();
		engine.opera = browser.opera = parseFloat(engine.ver);
	}
	else if(/AppleWebKit\/(\S+)/.test(ua)){
		engine.ver = RegExp["$1"];
		engine.webkit = parseFloat(engine.ver);
		
		//确定是Chrome还是Safari
		if(/Chrome\/(\S+)/.test(ua)){
			browser.ver = RegExp["$1"];
			browser.chrome = parseFloat(browser.ver);
		}
		else if(/Version\/(\S+)/.test(ua)){
			browser.ver = RegExp["$1"];
			browser.safari = parseFloat(browser.ver);
		}
		else{
			//近似的确定版本号
			var safariVersion = 1;
			if(engine.webkit<100){
				safariVersion = 1;
			} else if(engine.webkit<312){
				safariVersion = 1.2;
			} else if(engine.webkit<412){
				safariVersion = 1.3;
			} else{
				safariVersion = 1;
			}
			
			browser.safari = browser.ver = safariVersion;
		}	
	}
	else if(/KHTML\/(\S+)/.test(ua)||/Kongqueror\/([^;]+)/.test(ua)){
		engine.ver = browser.ver = RegExp["$1"];
		engine.khtml = browser.konq = parseFloat(engine.ver);
	}
	else if(/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)){
		engine.ver = RegExp["$1"];
		engine.gecko = parseFloat(engine.ver)
		
		//确定是不是Firefox
		if(/Firefox\/(\S+)/.test(ua)){
			browser.ver = RegExp["$1"];
			browser.firefox = parseFloat(browser.ver);	
		}
	}
	else if(/MSIE ([^;]+)/.test(ua)){
		engine.ver = browser.ver = RegExp["$1"];
		engine.ie = browser.ie = parseFloat(engine.ver);
	}
	 
	//检测浏览器
	browser.ie = engine.ie;
	browser.opera = engine.opera;
	 
	//检测平台
	var p = navigator.platform;
	system.win = p.indexOf("Win")==0;
	system.mac = p.indexOf("Mac")==0;
	system.x11 = (p = "X11")||(p.indexOf("Linux")==0);
	
	//检测Windows操作系统
	if(system.win){
		if(/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)){ 
			if(RegExp["$1"]=="NT"){
				 switch(RegExp["$2"]){
					case "5.0":
						system.win = "2000";
						break;
					case "5.1":
						system.win = "XP";
						break;
					case "6.0":
						system.win = "Visita";
						break;
					case "6.1":
						system.win = "7";
						break;
					default:
						system.win = "NT";	
						break;
				}
			}
			else if(RegExp["$1"]=="9x"){
				system.win = "ME";	
			}
			else {
				system.win = RegExp["$1"];
			}
		}
	}
	
	//移动设备
	system.iphone = ua.indexOf("iPhone")>-1;
	system.ipod = ua.indexOf("iPod")>-1;
	system.ipad = ua.indexOf("iPad")>-1;
	system.nokiaN = ua.indexOf("NokiaN")>-1; 
	
	//windows moblie
	if(system.win=="CE"){
		system.winMobile = system.win;
	} else if(system.win == "Ph"){
		if(/Windows Phone OS (\d+.\d+)/.test(ua)){
			system.win = "Phone";
			system.winMobile = parseFloat(RegExp["$1"]);
		}
	}
	
	//检测iOS版本
	if(system.mac&&ua.indexOf("Mobile")>-1){
		if(/CPU (?:iPhone)?OS (\d+_\d+)/.test(ua)){
			system.ios = parseFloat(RegExp.$1.replace("_","."));
		} else{
			system.ios = 2;//不能真正检测出来，所以只能猜测	
		}
	}
	
	//检测Android版本
	if(/Android (\d+\.\d+)/.test(ua)){
		system.android = parseFloat(RegExp.$1);	
	}
	
	//游戏系统
	system.wii = ua.indexOf("Wii")>-1;
	system.ps = /playstation/i.test(ua);
	
	//返回这些对象
	return {
		engine:engine,
		browser:browser,
		system:system
	};
	
}();
/* 
for(p in client.engine){
	document.write("client.engine."+p+":"+client.engine[p]+"<br/>");
}
document.write("<hr/>");
for(p in client.browser){
	document.write("client.browser."+p+":"+client.browser[p]+"<br/>");
}
document.write("<hr/>");
for(p in client.system){
	document.write("client.system."+p+":"+client.system[p]+"<br/>");
} */