英文教程:用CSS控制和操作BODY标记

作者佚名技术来源 CSS技术浏览发布时间 2012-03-01

for them to be red on your contact page (for some reason). There are a couple ways you could go about this.

You could declare a separate stylesheet for your contact page. This isn’t ideal, because it’s redundant. If you make any other changes, you’ll always have to make them both on the main stylesheet and the contact page stylesheet.
You could give all those links a unique class on that page. This isn’t ideal, because it isn’t very semantic and it’s also redundant. Why apply a class to every single link on the page when they really aren’t any different from links elsewhere on the site, contextually speaking?
The best solution is to give your the body a unique ID. This solves the problem perfectly. You can use the same stylesheet and target just the links you want to with a single CSS selector.

How it’s done

Simple, literally just apply the ID to the body tag:

   ...
</head>

<body id="contact-page">
   ...

Now for our example of making all links on the contact page red instead of blue, just use some CSS like this:

a {
color: blue;
}

#contact-page a {
   color: red;
}

How about a more practical example?

You got it. One of the most useful implementations of this technique is within navigation. Take a look at this sample navigation:

See how the forums tab is the “active” tab? Certainly that’s just a slight change in CSS, probably just a shift in the position of a background image. Perhaps the XHTML looks something like this:

...
<li><a href="/fieldtips">Field tips</a></li>
<li class="active"><a href="/forums">Forums</a></li>
...

The “active” class applied to the list item is what shifts the background image. That’ll do the trick, but what about when we move to the Field Tips page? We will have to remove the active class from the forums tab and apply it t

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