JavaScript判断IE版本号

这篇文章主要为大家详细介绍了JavaScript判断IE版本号的简单示例，具有一定的参考价值，可以用来参考一下。

/**
 *判断IE版本号
 * @param 
 * @arrange （www.idcnote.com）
 **/
// ----------------------------------------------------------
// 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
// ----------------------------------------------------------
    
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; 
}());