js获取浏览器版本

获取火狐，谷歌，ie，常见浏览器的方法

function myBrowser(){
	var userAgent = navigator.userAgent,     
	rMsie = /(msies|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;    
	}    
	var x = browser+parseInt(version);
	console.log(x);
	return x
}