JS code to determine browser types IE, FF, Opera, Safari, Chrome and version _javascript tips

Because IE10-IE11 version problem, no longer support document.all judgment, so IE judgment function to be written again

function Isie () {//ie?
      if (!! Window. ActiveXObject | | ' ActiveXObject ' in Window ' return
        true;
      else return
        false;
    

First, browser only, regardless of version

Copy Code code as follows:

function Mybrowser () {
var useragent = navigator.useragent; Gets the useragent string for the browser
var Isopera = Useragent.indexof ("Opera") >-1;
if (Isopera) {
Return "Opera"
}; Judge whether Opera browser
if (Useragent.indexof ("Firefox") >-1) {
return "FF";
}//Determine if Firefox browser
if (Useragent.indexof ("Chrome") >-1) {
return "Chrome";
}
if (Useragent.indexof ("Safari") >-1) {
return "Safari";
}//Determine if Safari browser
if (Useragent.indexof ("compatible") >-1 && useragent.indexof ("MSIE") >-1 &&!isopera) {
return "IE";
}; Determine if IE browser
}

Here is the function called above
var mb = Mybrowser ();
if ("IE" = MB) {
Alert ("I am IE");
}
if ("FF" = MB) {
Alert ("I am Firefox");
}
if ("Chrome" = MB) {
Alert ("I am Chrome");
}
if ("Opera" = MB) {
Alert ("I am Opera");
}
if ("Safari" = MB) {
Alert ("I am Safari");
}

The second is to differentiate the browser and consider IE5.5 6 7 8

Copy Code code as follows:

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
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");
}

Here is a decision to determine the current browser is IE JS code.

The principle is the use of IE and standard browsers in the processing array of the ToString method of the difference made. For a standard browser, if the last character in the array identifier a comma, the JS engine automatically strips it.

<script> var ie =!-[1,]; alert (IE); </script>
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