JS Get Browser version

1, in the web development, will often let you judge the current use of the browser and the browser version, according to the browser version to adjust the style of CSS,

So that the Web interface in each browser to achieve the best results, 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;
}