JavaScript judges the browser and its version information

Judging by window. navigator:

function getBrowserInfo(){
 var Info = {};
 var str = window.navigator.userAgent.toLowerCase();
 var bReg =/(msie|firefox|chrome|opera|version).*?([\d.]+)/;
 var infoArr = str.match(bReg);
 Info.browser = infoArr[1].replace(/version/, "safari");
 Info.ver = infoArr[2];
 return Info;
}
var BomInfo = getBrowserInfo();
document.write(BomInfo.browser);
document.write("</br>");
document.write(BomInfo.ver);