完整的用户代理字符串检测脚本

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;

//具体版本号
ver: null
};

//平台、设备和操作系统
var system = {
win: false,
mac: false,
xll: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"];
browser.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 =1 parseFloat(browser.ver);
}else {
//近似地确定版本号
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 = 2;
}

browser.safari = browser.ver = safariVersion;
}
}else if(/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.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"];
browser.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(/MISE([^;]+)/.test(ua)){
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = parseFloat(engine,ver);
}

//检查浏览器
browser.ie = engine.ie;
browser.opera = engine.opera;

//检测平台
var p = navigator.platfrom;
system.win = p.indexOf("win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.xll = p.indexOf("wll") || (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 = "Vista";
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 mobile
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
};
}();