以下是完整的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"];
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 = "Vista";
break;
case "6.1":
system.win = "7";
break;
default:
system.win = "NT";
break;
}
client.js
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