javascript判断浏览器版本及内核的js代码

一段判断浏览器版本及内核的js代码（PC端手机端即可，但是苹果手机不知为何不管用）

< script type = “text/javascript” >
var userAgent = navigator.userAgent,
rMsie = /(msie\s|trident\/7)([\w.]+)/,
rTrident = /(trident)\/([\w.]+)/,
rFirefox = /(firefox)\/([\w.]+)/,
rOpera = /(opera).+version\/([\w.]+)/,
rNewOpera = /(opr)\/(.+)/,
rChrome = /(chrome)\/([\w.]+)/,
rSafari = /version\/([\w.]+).*(safari)/;
var matchBS, matchBS2;
var browser;
var version;
var ua = userAgent.toLowerCase();
var uaMatch = function(ua) {
matchBS = rMsie.exec(ua);
if (matchBS != null) {
matchBS2 = rTrident.exec(ua);
if (matchBS2 != null) {
switch (matchBS2[2]) {
case “4.0”:
return {
browser:
“IE”,
version: “8”
};
break;
case “5.0”:
return {
browser:
“IE”,
version: “9”
};
break;
case “6.0”:
return {
browser:
“IE”,
version: “10”
};
break;
case “7.0”:
return {
browser:
“IE”,
version: “11”
};
break;
default:
return {
browser:
“IE”,
version: “undefined”
};
}
} else return {
browser: “IE”,
version: matchBS[2] || “0”
};
}
matchBS = rFirefox.exec(ua);
if ((matchBS != null) && (!(window.attachEvent)) && (!(window.chrome)) && (!(window.opera))) {
return {
browser: matchBS[1] || “”,
version: matchBS[2] || “0”
};
}
matchBS = rOpera.exec(ua);
if ((matchBS != null) && (!(window.attachEvent))) {
return {
browser: matchBS[1] || “”,
version: matchBS[2] || “0”
};
}
matchBS = rChrome.exec(ua);
if ((matchBS != null) && ( !! (window.chrome)) && (!(window.attachEvent))) {
matchBS2 = rNewOpera.exec(ua);
if (matchBS2 == null) return {
browser: matchBS[1] || “”,
version: matchBS[2] || “0”
};
else return {
browser: “Opera”,
version: matchBS2[2] || “0”
};
}
matchBS = rSafari.exec(ua);
if ((matchBS != null) && (!(window.attachEvent)) && (!(window.chrome)) && (!(window.opera))) {
return {
browser: matchBS[2] || “”,
version: matchBS[1] || “0”
};
}
if (matchBS != null) {
return {
browser: “undefined”,
version: ” browser”
};
}
}
var browserMatch = uaMatch(userAgent.toLowerCase());
if (browserMatch.browser) {
browser = browserMatch.browser;
version = browserMatch.version;
}
alert(browser + “:” + version); < /script>/

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