JavaScript detection Browser version number (IE6,IE7,IE8,FF)

The code is as follows

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function Mybrowser () { var useragent = navigator.useragent; Gets the useragent string for the browser var Isopera = Useragent.indexof ("Opera") >-1; Judge whether Opera browser var Isie = Useragent.indexof ("compatible") >-1 && useragent.indexof ("MSIE") >-1 &&!isopera; Determine if IE browser var ISFF = Useragent.indexof ("Firefox") >-1; Determine if the Firefox browser var Issafari = Useragent.indexof ("Safari") >-1; Determine if Safari browser if (Isie) { var IE5 = IE55 = IE6 = IE7 = IE8 = false; var reie = new RegExp ("MSIE (\d+\.\d+);"); Reie.test (useragent); var fieversion = parsefloat (regexp["$"); IE55 = Fieversion = = 5.5; IE6 = Fieversion = = 6.0; IE7 = Fieversion = = 7.0; IE8 = Fieversion = = 8.0; if (IE55) {return "IE55";} if (IE6) {return "IE6";} if (IE7) {return "IE7";} if (IE8) {return "IE8";} }//isie End if (ISFF) {return "FF";} if (Isopera) {return "Opera";} }//mybrowser () End

Here is the function called above

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if (mybrowser () = = "FF") {alert ("I am Firefox");} if (mybrowser () = = "Opera") {alert ("I am Opera");} if (mybrowser () = = "Safari") {alert ("I am Safari");} if (mybrowser () = = "IE55") {alert ("I am IE5.5");} if (mybrowser () = = "IE6") {alert ("I am IE6");} if (mybrowser () = = "IE7") {alert ("I am IE7");} if (mybrowser () = = "IE8") {alert ("I am IE8");}