//取得用戶代理字符串 并全部小寫。var ua = navigator.userAgent.toLowerCase();document.write(ua);

var ua = navigator.userAgent.toLowerCase();var isStrict = document.compatMode == "CSS1Compat"isOpera = ua.indexOf("opera") > -1isChrome = ua.indexOf("chrome") > -1isSafari = !isChrome && (/webkit|khtml/).test(ua)isSafari3 = isSafari && ua.indexOf('webkit/5') != -1isIE = !isOpera && ua.indexOf("msie") > -1isIE7 = !isOpera && ua.indexOf("msie 7") > -1isIE8 = !isOpera && ua.indexOf("msie 8") > -1isGecko = !isSafari && !isChrome && ua.indexOf("gecko") > -1isGecko3 = isGecko && ua.indexOf("rv:1.9") > -1isBorderBox = isIE && !isStrict isWin7 = ua.indexOf("nt 6.1") > -1isVista = ua.indexOf("nt 6.0") > -1isWin2003 = ua.indexOf("nt 5.2") > -1isWinXp = ua.indexOf("nt 5.1") > -1isWin2000 = ua.indexOf("nt 5.0") > -1isWindows = (ua.indexOf("windows") != -1 || ua.indexOf("win32") != -1)isMac = (ua.indexOf("macintosh") != -1 || ua.indexOf("mac os x") != -1)isAir = (ua.indexOf("adobeair") != -1)isLinux = (ua.indexOf("linux") != -1) var sys = "";var broser = ""; if(isIE){  broser = "IE 6";}else if(isIE7){  broser = "IE 7";}else if(isIE8){  broser = "IE 8";}else if(isOpera){  broser = "Opera";}else if(isChrome){  broser = "Chrome";}else if(isSafari){  broser = "Safari";}else if(isSafari3){  broser = "Safari3";}else{  broser = "Unknow";} if(isWin7){  sys = "Windows 7";}else if(isVista){  sys = "Vista";}else if(isWinXp){  sys = "Windows xp";}else if(isWin2003){  sys = "Windows 2003";}else if(isWin2000){  sys = "Windows 2000";}else if(isWindows){  sys = "Windows";}else if(isMac){  sys = "Macintosh";}else if(isAir){  sys = "Adobeair";}else if(isLinux){  sys = "Linux";}else{  sys = "Unknow";}document.write(ua);alert(sys + ":" + broser);

var client = function(){//呈現(xiàn)引擎var engine = { ie   : 0, gecko : 0, webkit : 0, khtml : 0, opera : 0, //完整的版本號 ver  : null};//瀏覽器var browser = {//主要瀏覽器 ie   : 0, firefox : 0, konq  : 0, opera  : 0, chrome : 0, safari : 0, //具體的版本號 ver   : null};//平臺、設備和操作系統(tǒng)var system ={ win : false, mac : false, xll : false, //移動設備 iphone  : false, ipod   : false, nokiaN  : false, winMobile : false, macMobile : false, //游戲設備 wii : false, ps : false};//檢測呈現(xiàn)引擎和瀏覽器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); //確定是Chrome還是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 { //近似地確定版本號 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 = 2; } browser.safari = browser.ver = safariVersion;  }} else if (/KHTML//(/S+)/.test(ua) || /Konquersor//([^;]+)/.test(ua)){ engine.ver = browser.ver = RegExp["$1"]; engine.khtml = browser.kong = paresFloat(engine.ver); } else if (/rv:([^/)]+)/) Gecko///d{8}/.test(ua)){ engine.ver = RegExp["$1"] engine.gecko = parseFloat(engine.ver); //確定是不是Firefox if (/Firefox//(/S+)/.test(ua)){ browser.ver = RegExp["$1"]; browser.firefox = pareseFloat(browser.ver); }} else if(/MSIE([^;]+)/.test(ua)){ browser.ver = RegExp["$1"]; browser.firefox = parseFloat(browser.ver);}//檢測瀏覽器browser.ie = engine.ie;browser.opera = engine.opera;//檢測平臺var p = navigator.platform;system.win = p.indexOf("Win") == 0;system.mac = p.indexOf("Mac") == 0;system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);//檢測Windows操作系統(tǒng)if (system.win){ if (/Win(?:doms)?([^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 = "Vista";   break;  default  :   system.win = "NT";   break;    } } else if (RegExp["$1"]){  system.win = "ME"; } else {  system.win = RegExp["$1"]; } }}//移動設備system.iphone = ua.indexOf("iPhone") > -1;system.ipod   = ua.indexOf("iPod") > -1;system.nokiaN = ua.indexOf("NokiaN") > -1;system.winMobile = (system.win == "CE");system.macMobile = (system.iphone || system.ipod);//游戲系統(tǒng)system.wii = ua.indexOf("Wii") > -1;system.ps = /playstation/i.test(ua);//返回這些對象return { engine: engine, browser: browser, system: system};}()