canonical

Google has introduced a link tag rel value of canonical which is used for defining the value of the page that Google should use. Why? Lets say you have an eCommerce site and one of the product URLs is:

Google引入了规范的链接标签rel值，用于定义Google应该使用的页面的值。 为什么？ 假设您有一个电子商务网站，并且其中一个产品网址是：

http://yoursite.com/product.php?p=david+walsh+blog+book

Imagine now that you can make a slight customization to the product that changes the URL to:

现在想象一下，您可以对将URL更改为以下内容的产品进行一些自定义：

http://yoursite.com/product.php?p=david+walsh+blog+book&color=red

Uh oh -- Google sees duplicate content! The code shows essentially the same page so Google thinks you're pulling gangsta stuff. Now you can tell Google what URL to use for the current page to avoid duplicate content penalization.

呃-Google看到重复的内容！ 该代码基本上显示了相同的页面，因此Google认为您在提取黑帮的东西。 现在，您可以告诉Google当前页面使用的URL，以避免重复的内容惩罚。

XHTML (The XHTML)

Don't let your website get penalized by Google; use this link/rel tag combination for your highly variable pages.

不要让您的网站受到Google的惩罚； 将此链接/相对标记组合用于高度可变的页面。

翻译自:

canonical