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javascript用户代理检测

2014-09-14 23:36 363 查看
<script type="text/javascript">
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,
konq: 0,
chrome: 0,
safari: 0,

// 具体版本号
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,
nokiaN: false,
winMobile: false,
macMobile: 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 Chrmoe 还是 Safari
if(/Chrmoe\/(\S+)/.test(ua)){
browser.ver = RegExp["$1"];
browser.chrome = parseFloat(browser.ver);
} else if(/Version\/(\S+)/.test(ua)){
browser.ver = RegExp["$1"];
browser.safri = 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 = 2;
}

browser.safari = browser.ver = safariVersion;
}
} else if (/KHTML\/(\S+)/.test(ua) || /Knoqueror\/([^;]+)/.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";
brreak;
case "5.1":
system.win = "xp";
break;
case "6.0":
system.win = "Vista";
break;
case "6.1":
system.win = " Win7";
break;
default:
system.win = "NT";
break;
}
} else if (RegExp["$1"]){
system.wein = "ME";
} else {
system.win = RegExp["$1"];
}
}
}

// 移动设备
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
};
}();

if (client.browser.ie == "0"){
alert("请选择使用IE浏览器!");
} else {
alert("您现在使用的是IE浏览器");
}
</script>
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