js判断浏览器类型及版本(包含IE11)

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var userAgent = navigator.userAgent,
	rMsie = /(msie\s|trident.*rv:)([\w.]+)/,
	rFirefox = /(firefox)\/([\w.]+)/,
	rOpera = /(opera).+version\/([\w.]+)/,
	rChrome = /(chrome)\/([\w.]+)/,
	rSafari = /version\/([\w.]+).*(safari)/;
var browser;
var version;
var ua = userAgent.toLowerCase();
function uaMatch(ua) {
	var match = rMsie.exec(ua);
	if (match != null) {
		return {
			browser : "IE",
			version : match[2] || "0"
		};
	}
	var match = rFirefox.exec(ua);
	if (match != null) {
		return {
			browser : match[1] || "",
			version : match[2] || "0"
		};
	}
	var match = rOpera.exec(ua);
	if (match != null) {
		return {
			browser : match[1] || "",
			version : match[2] || "0"
		};
	}
	var match = rChrome.exec(ua);
	if (match != null) {
		return {
			browser : match[1] || "",
			version : match[2] || "0"
		};
	}
	var match = rSafari.exec(ua);
	if (match != null) {
		return {
			browser : match[2] || "",
			version : match[1] || "0"
		};
	}
	if (match != null) {
		return {
			browser : "",
			version : "0"
		};
	}
}
var browserMatch = uaMatch(userAgent.toLowerCase());
if (browserMatch.browser) {
	browser = browserMatch.browser;
	version = browserMatch.version;
}