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JavaScript 权威指南-Web浏览器中的JavaScript

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13.4.6 IE里的条件注释
HTML注释

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<!--[if IE 6]>
This content is actually inside an HTML comment.
It will only be displayed in IE 6.
<![endif]-->
<!--[if lte IE 7]>
This content will only be displayed by IE 5, 6 and 7 and earlier.
lte stands for "less than or equal". You can also use "lt", "gt" and "gte".
<![endif]-->
<!--[if !IE]> <-->
This is normal HTML content, but IE will not display it
because of the comment above and the comment below.
<!--> <![endif]-->
This is normal content, displayed by all browsers.


<!--[if IE]><script src="excanvas.js"></script><![endif]-->

JavaScript注释
JScript是Microsoft的JavaScript解释器的名字, 而@_jscript变量在IE总是为true.

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/*@cc_on
    @if (@_jscript)
        // This code is inside a JS comment but is executed in IE.
        alert("In IE");
    @end
@*/


/*@cc_on
    @if (@_jscript)
        // This code is inside a conditional comment, which is also a
        // regular JavaScript comment. IE runs it but other browsers ignore it.
        alert('You are using Internet Explorer);
    @else*/
        // This code is no longer inside a JavaScript comment, but is still
        // inside the IE conditional comment. This means that all browsers
        // except IE will run this code.
        alert('You are not using Internet Explorer');
    /*@end
@*/

13.6 安全性

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