Detect IE version (prior to v9) in JavaScript

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I want to bounce users of our web site to an error page if they\'re using a version of Internet Explorer prior to v9. It\'s just not worth our time and money to

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我寻月下人不归

2020-11-22 08:58

Detect IE in JS using conditional comments

// ----------------------------------------------------------
// A short snippet for detecting versions of IE in JavaScript
// without resorting to user-agent sniffing
// ----------------------------------------------------------
// If you're not in IE (or IE version is less than 5) then:
//     ie === undefined
// If you're in IE (>=5) then you can determine which version:
//     ie === 7; // IE7
// Thus, to detect IE:
//     if (ie) {}
// And to detect the version:
//     ie === 6 // IE6
//     ie > 7 // IE8, IE9 ...
//     ie < 9 // Anything less than IE9
// ----------------------------------------------------------

// UPDATE: Now using Live NodeList idea from @jdalton

var ie = (function(){

    var undef,
        v = 3,
        div = document.createElement('div'),
        all = div.getElementsByTagName('i');

    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
        all[0]
    );

    return v > 4 ? v : undef;

}());

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面向向阳花

2020-11-22 08:58

Window runs IE10 will be auto update to IE11+ and will be standardized W3C

Nowaday, we don't need to support IE8-

    <!DOCTYPE html>
    <!--[if lt IE 9]><html class="ie ie8"><![endif]-->
    <!--[if IE 9]><html class="ie ie9"><![endif]-->
    <!--[if (gt IE 9)|!(IE)]><!--><html><!--<![endif]-->
    <head>
        ...
        <!--[if lt IE 8]><meta http-equiv="Refresh" content="0;url=/error-browser.html"><![endif]--
        ...
    </head>

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离开以前

2020-11-22 08:59
To detect MSIE (v6 - v7 - v8 - v9 - v10 - v11) easily :
```
if (navigator.userAgent.indexOf('MSIE') !== -1 || navigator.appVersion.indexOf('Trident/') > 0) {
   // MSIE
}
```
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隐瞒了意图╮

2020-11-22 08:59
This function will return the IE major version number as an integer, or undefined if the browser isn't Internet Explorer. This, like all user agent solutions, is suceptible to user agent spoofing (which has been an official feature of IE since version 8).
```
function getIEVersion() {
    var match = navigator.userAgent.match(/(?:MSIE |Trident\/.*; rv:)(\d+)/);
    return match ? parseInt(match[1]) : undefined;
}
```
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被撕碎了的回忆

2020-11-22 09:00

Return IE version or if not IE return false

function isIE () {
  var myNav = navigator.userAgent.toLowerCase();
  return (myNav.indexOf('msie') != -1) ? parseInt(myNav.split('msie')[1]) : false;
}

Example:

if (isIE () == 8) {
 // IE8 code
} else {
 // Other versions IE or not IE
}

if (isIE () && isIE () < 9) {
 // is IE version less than 9
} else {
 // is IE 9 and later or not IE
}

if (isIE()) {
 // is IE
} else {
 // Other browser
}

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眼角桃花

2020-11-22 09:00
If nobody else has added an addEventLister-method and you're using the correct browser mode then you could check for IE 8 or less with
```
if (window.attachEvent && !window.addEventListener) {
    // "bad" IE
}
```
Legacy Internet Explorer and attachEvent (MDN)
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