添加到这个讨论。我刚刚想出了一个 jquery $.browser 插件，它不是“检测”，只是将用户代理解析为一个易于使用的对象。可以很容易地应用进一步的逻辑来进一步分解和解析特定的浏览器和平台。
我在找到here: UserAgentString.com 的用户代理上得到了非常可靠的结果。我什至包括了 ie11 的版本检测（接近底部）。
//The following code is by no means perfect, nor is it meant to be a standalone 'detection' plugin.
//It demonstrates parsing the useragent string into an easy to manage object.
//Even if it does make detection rediculously easy.. :)
//Because this regex makes no assumptions in advance.
//IMO, It's compatibilty and maintainability is much higher than those based on static identifiers.
/*
uaMatch replacement that parses a useragent string into an object
useragent segments can be Name Value OR Name/Value OR Name
Segment: Name Value
Name: parsed to the last whitespace character
Value: value after the last whitespace character
Matches: (.NET CLR) (#.##), Android 2.3.4, etc
Note: this regex can have leading/trailing whitespace (trimmed for object properties)
Segment: Name/Value
Matches: all values matching Name/Value
Example: Firefox/24.0, Safari/533.1, Version/12.1, etc
Segment: Name
Matches: identifiers that hold no values (value of 'true' is implied)
Example: Macintosh, Linux, Windows, KHTML, U, etc
WARNING: not necessarily compatible with jQuery's $.browser implementation.
- not recommended as a replacement for plugins that require it to function.
*/
(function ($) {
var ua = navigator.userAgent.toLowerCase();
var regex = /compatible; ([\w.+]+)[ \/]([\w.+]*)|([\w .+]+)[: \/]([\w.+]+)|([\w.+]+)/g;
var match = regex.exec(ua);
var browser = { };
while (match != null) {
var prop = {};
if (match[1]) {
prop.type = match[1];
prop.version = match[2];
}
else if (match[3]) {
prop.type = match[3];
prop.version = match[4];
}
else {
prop.type = match[5];
}
// some expressions have leading whitespace (i couldn't avoid this without a more complex expression)
// trim them and get rid of '.' (' .NET CLR' = 'net_clr')
prop.type = $.trim(prop.type).replace(".","").replace(" ","_");
var value = prop.version ? prop.version : true;
if (browser[prop.type]) {
if (!$.isArray(browser[prop.type]))
browser[prop.type] = new Array(browser[prop.type]);
browser[prop.type].push(value);
}
else browser[prop.type] = value;
match = regex.exec(ua);
}
for (var i in browser)
if (i.indexOf("mac") > -1)
browser.mac = true;
if (browser.windows_nt && !browser.windows)
browser.windows = true;
//put known browsers into the 'version' property for 'some' jquery compatibility
//for sake of argument chromium 'is' chrome
if (browser.chromium && !browser.chrome)
browser.chrome = browser.chromium;
//chrome / safari / webkit
if (browser.chrome) {
browser.version = browser.chrome;
}
else if (browser.safari) {
browser.version = browser.safari;
}
else {
if (browser.applewebkit)
browser.webkit = browser.applewebkit;
if (browser.webkit)
browser.version = browser.webkit;
}
//firefox / gecko
if (browser.firefox) {
if (browser.rv)
browser.version = browser.rv;
else browser.version = browser.firefox;
}
else if (browser.gecko) {
if (browser.rv)
browser.version = browser.rv;
else browser.version = browser.gecko;
}
//opera
if (browser.opera && !browser.version)
browser.version = browser.opera;
//msie
if (browser.trident && browser.rv) //ie11
browser.msie = browser.rv;
if (browser.msie)
browser.version = browser.msie;
$.browser = browser;//Rename to reduce confliction?
//WAS USED FOR TESTING & DISCOVERY (very useful)
//TODO: remove line below
alert(JSON.stringify($.browser));
}) (jQuery);
在 Internet Explorer 10 上，JSON.stringify 将输出如下内容：
{"mozilla":"5.0","msie":"10.0","windows_nt":"6.2","trident":"6.0","net4.0e":true,"net4.0c":true,"net_clr":["3.5.30729","2.0.50727","3.0.30729"],"windows":true,"version":"10.0"}