IE条件语句 IE hack大全

<!--[if IE 6]>Special instructions for IE 6 here<![endif]-->
[code]

Their basic structure is the same as an HTML ment (<!-- -->). Therefore all other browsers will see them as normal ments and will ignore them entirely.
IE, though, has been programmed to recognize the special <!--[if IE]> syntax, resolves the ifand parses the content of the conditional ment as if it were normal page content.
Since conditional ments use the HTML ment structure, they can only be included in HTML files, and not in CSS files. I'd have preferred to put the special styles in the CSS file, but that's impossible. You can also put an entire new <link> tag in the conditional ment referring to an extra style sheet.
Example
Below I added a lot of conditional ments that print out messages aording to your IE version.

Note however, that if you use multiple Explorers on one puter, the conditional ments will render as if all these Explorer versions are the highest Explorer version available on your machine (usually Explorer 6.0).

Test
Below are a few conditional ments that reveal the IE version you're using.

Aording to the conditional ment this is IE
Aording to the conditional ment this is IE 7
Aording to the conditional ment this is IE lower than 9
Aording to the conditional ment this is IE lower or equal to 7
Aording to the conditional ment this is IE greater than 6

Code
The syntax I use is:
[code]
<p class="aent">
<!--[if IE]>
Aording to the conditional ment this is IE<br />
<![endif]-->
<!--[if IE 6]>
Aording to the conditional ment this is IE 6<br />
<![endif]-->
<!--[if IE 7]>
Aording to the conditional ment this is IE 7<br />
<![endif]-->
<!--[if IE 8]>
Aording to the conditional ment this is IE 8<br />
<![endif]-->
<!--[if IE 9]>
Aording to the conditional ment this is IE 9<br />
<![endif]-->
<!--[if gte IE 8]>
Aording to the conditional ment this is IE 8 or higher<br />
<![endif]-->
<!--[if lt IE 9]>
Aording to the conditional ment this is IE lower than 9<br />
<![endif]-->
<!--[if lte IE 7]>
Aording to the conditional ment this is IE lower or equal to 7<br />
<![endif]-->
<!--[if gt IE 6]>
Aording to the conditional ment this is IE greater than 6<br />
<![endif]-->
<!--[if !IE]> -->
Aording to the conditional ment this is not IE<br />
<!-- <![endif]-->
</p>

<!--[if !IE]> -->