Js gets the browser version to style the CSS

1. In web development, you will often be asked to determine which browser and version of the browser you are currently using.

To achieve the best results in the web interface in each browser, the following is the code to get the current browser:

 
getBrowserVersion:function(){ 
var agent = navigator.userAgent.toLowerCase(); 
var arr=[]; 
var Browser=""; 
var Bversion=""; 
var verinNum=""; 
//IE 
if(agent.indexOf("msie") > 0){ 
var regStr_ie = /msie [d.]+;/gi ; 
Browser="IE"; 
Bversion=""+agent.match(regStr_ie) 
} 
//firefox 
else if(agent.indexOf("firefox") > 0){ 
var regStr_ff = /firefox/[d.]+/gi; 
Browser="firefox"; 
Bversion=""+agent.match(regStr_ff); 
} 
//Chrome 
else if(agent.indexOf("chrome") > 0){ 
var regStr_chrome = /chrome/[d.]+/gi ; 
Browser="chrome"; 
Bversion=""+agent.match(regStr_chrome); 
} 
//Safari 
else if(agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0){ 
var regStr_saf = /version/[d.]+/gi ; 
Browser="safari"; 
Bversion=""+agent.match(regStr_saf); 
} 
//Opera 
else if(agent.indexOf("opera")>=0){ 
var regStr_opera = /version/[d.]+/gi ; 
Browser="opera"; 
Bversion=""+agent.match(regStr_opera); 
}else{ 
var browser=navigator.appName; 
if(browser=="Netscape"){ 
var version=agent.split(";"); 
var trim_Version=version[7].replace(/[ ]/g,""); 
var rvStr=trim_Version.match(/[d.]/g).toString(); 
var rv=rvStr.replace(/[,]/g,""); 
Bversion=rv; 
Browser="IE" 
} 
} 
verinNum=(Bversion+"").replace(/[^0-9.]/ig,""); 
arr.push(Browser); 
arr.push(verinNum); 
return arr; 
}