巧妙判断IE浏览器版本的js代码

在网上看到的，收藏一下：

// ----------------------------------------------------------

// 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;

    

}());

 

二：

/*@cc_on alert(document.documentMode||( document.compatMode == "CSS1Compat" ? "XMLHttpRequest" in window ? @_jscript_version*10-50 : 6 : 5)) @*/