The meaning of metra in Html_html/css_WEB-ITnose

from: http://dev.csdn.net/article/60/60902.shtm

meta is a response header message used to simulate the HTTP protocol in HTML documents . The meta tag is used in the and of the web page. The meta tag has many uses. There are two attributes of meta: name and http-equiv. The name attribute is mainly used to describe web pages, corresponding to content (web page content), so that search engine robots can find and classify them (currently, almost all search engines use online robots to automatically find meta values ​​to classify web pages). The most important of these are description (description of the site on search engines?br />?) and keywords (categorization keywords), so a meta value should be added to each page. The more commonly used ones are as follows:

name attribute

　1. used to describe generation tools (such as Microsoft FrontPage 4.0), etc. ;

2. Indicate the keywords of your webpage to search engines;

3. Tell search engines the main content of your site;

　4. Tell search engines how your site is made Author;

5.

The attributes are described as follows:

Set to all: files will be retrieved, and links on the page can be queried;

Set to none: files will not be retrieved, and links on the page cannot be queried;

Set to index: the file will be retrieved;

Set to follow: links on the page can be queried;

Set to noindex: the file will not be retrieved , but the links on the page can be queried;

Set to nofollow: the file will not be retrieved, but the links on the page can be queried.

　http-equiv attribute

　1.

and are used to describe the text and language used in making the homepage;

Another example is that English is ISO-8859- 1 character set, as well as BIG5, utf-8, shift-Jis, Euc, Koi8-2 and other character sets;

　2. Schedule the webpage to jump to the page http://yourlink within the specified time n;

　3. can be used to set the expiration time of the web page. Once it expires, it must be recalled on the server. It should be noted that the GMT time format must be used;

4. is used to set the browser to prevent the browser from accessing the page content from the cache of the local machine. After setting, once you leave the web page, you will not be able to access the page content from the cache. Recall;

5. cookie setting, if the web page expires, The saved cookies will be deleted. It should be noted that the GMT time format must be used;

　6.
7. Force the page to be displayed as an independent page in the current window, which can prevent your own web page from being called as a frame page by others;

　8. andSet special effects when entering and leaving the page. This function is the "format/webpage transition" in FrontPage, but the added page cannot be a frame page.

The above are several commonly used meta attributes. Friends who have personal homepages may wish to add them to your homepage. The effect will be different :).