很有意思的判断ie浏览器

时间：2010-08-21 来源：wlstyle

作者博文链接:很有意思的判断ie浏览器

代码如下：

// ----------------------------------------------------------
// 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 = '',
        all[0]
    );

    return v > 4 ? v : undef;

}());

主要利用点:

1.利用ie的条件注释

2.通过getElementsByTagName的HTMLCollection 是动态的。会随着dom结构中的变化而变化

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