JS gets browser version and name implementation function_javascript skills

// Get browser name and version information
function appInfo( ){
var browser = {
msie: false, firefox: false, opera: false, safari: false,
chrome: false, netscape: false, appname: 'unknown', version: 0
},
userAgent = window.navigator.userAgent.toLowerCase();
if ( /(msie|firefox|opera|chrome|netscape)D (d[d.]*)/.test( userAgent ) ){
browser[RegExp.$1] = true;
browser.appname = RegExp.$1;
browser.version = RegExp.$2;
} else if ( /versionD (d[d. ]*).*safari/.test( userAgent ) ){ // safari
browser.safari = true;
browser.appname = 'safari';
browser.version = RegExp.$2;
}
return browser;
}
// Calling example
var myos = appInfo();
// If the current browser is IE, pop up the browser version, otherwise pop up the current browser Device name and version
if ( myos.msie ) {
alert( myos.version );
} else {
alert( myos.appname myos.version );
}

function getOs()
{
var OsObject = "";
if(navigator.userAgent.indexOf("MSIE")>0) {
return "MSIE";
}
if(isFirefox=navigator.userAgent .indexOf("Firefox")>0){
return "Firefox";
}
if(isSafari=navigator.userAgent.indexOf("Safari")>0) {
return "Safari";
}
if(isCamino=navigator.userAgent.indexOf("Camino")>0){
return "Camino";
}
if(isMozilla=navigator .userAgent.indexOf("Gecko/")>0){
return "Gecko";
}
}