IF IE conditionals not working

问题:

I have been driving myself nuts trying to get comment conditionals to work and I'm not having any luck can someone explain what I'm doing wrong?

Here is my code:

        <!--[if IE 10]>
            IE IS VERSION 10<br />
        <![endif]-->
        <!--[if !IE]><!-->
            Browser is not IE
        <!--<![endif]-->
        <!--[if lt IE 9]>
            IE IS LESS THAN VERSION 9<br />
        <![endif]-->

What is happening is frustratingly inconsistant. When I load the page with the above code in IE8 it get the message "IE IS LESS THAN VERSION 9" Great right? No because when I load the SAME PAGE in IE10 I get the message "Browser is not IE"

Why does it think that IE10 is not an IE browser?! I've been crawling page after page but there doesn't seem to be any thing wrong with my code from what I've found.

回答1:

CSS Solution:

If you want to apply only CSS base on browser then you can try:

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {  
   /* Put your IE-only styles here. Works for IS 10 & IE 11*/
}

JavaScript Solution:

IE 10 does not support conditional statements.

Conditional statements in Internet Explorer 10.. It will treat conditional comments as regular HTML comments, and ignored entirely.

Use a feature detection library such as Modernizr instead of browser detection.

found a solution on impressivewebs in this comment:

Here is Demo to test

The solution is:

if (Function('/*@cc_on return document.documentMode===10@*/')()) {
    alert('IE 10');
} else {
    alert('Not IE 10');
}

It

• doesn’t need conditional comments;
• works even if comment stripping compression/processing;
• no ie10 class added in Internet Explorer 11;
• more likely to work as intended with Internet Explorer 11 running in Internet Explorer 10 compatibility mode;
• doesn’t need standalone script tag (can just be added to other JavaScript code in the head).
• doesn't need jQuery to test

回答2:

I'm surprised that no one has added in a css-only solution. If you just want to use css, then use a statement like this:

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {  
   /* Put your IE-only styles here. Works for IS 10 & IE 11*/
}

This way you don't have to rely on jquery, or any html markup. Just post it in the css and you are good to go.

Now, is it a hack? Likely. This depends on using the microsoft high-contrast tag, but since no other browser uses the ms tag then you should be good to go.

Finally, check out these pages for more info:

Blog Post

MS Site on the contrast tag

回答3:

IE 10, 11 and upward no longer support conditional comments.

See this answer: https://stackoverflow.com/a/22187600/1498739

回答4:

IE 10 dropped conditional comments.

You can do something similar in javascript like this:

if ($.browser.msie && $.browser.version === 10) {
    // stuff here (like adding an IE10 class to the body or html tag
}

回答5:

Try add the following meta tag near the top of the page to opt into Internet Explorer 9 behavior:

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE9">

This is because conditional comments has been removed in Internet Explorer 10 standards and quirks modes for improved interoperability and compliance with HTML5. This means that Conditional Comments are now treated as regular comments, just like in other browsers. This change can impact pages written exclusively for Windows Internet Explorer or pages that use browser sniffing to alter their behavior in Internet Explorer.