Summary of the use of meta attributes in html

Original text: http://www.haorooms.com/post/html_meta_ds

Introduction

There was a discussion about meta in my previous blog Introduction, for example: http://www.haorooms.com/post/liulanq_think_ie This article about browser security introduces some attributes of IE under meta, which can realize transition conversion between pages. Already mentioned in SEO optimization. The following is a detailed introduction to the functions and uses of meta.

Preface

meta is an auxiliary tag in the head area of ​​html language. Maybe you think this code is dispensable. In fact, if you can make good use of meta tags, it will bring you unexpected effects. The functions of meta tags are: search engine optimization (SEO), defining the language used on the page, automatically refreshing and pointing to new pages, and realizing dynamics during web page conversion. Effect, control page buffering, web page rating and evaluation, control the window for web page display, etc.!

html meta summary

The composition of meta tag: meta tag has two attributes, they are http-equiv attribute and name attribute, different attributes are Different parameter values, these different parameter values ​​realize different web page functions.

1. Name attribute

The name attribute is mainly used to describe the web page, and the corresponding attribute value is content. The content in content is mainly for search engine robots to find. Information and classification information. The syntax format of the name attribute of the

meta tag is:

[code]<meta name="参数"content="具体的参数值">。

The name attribute mainly has the following parameters:

A. Keywords　

Description: keywords are used to tell search engines what the keywords of your web page are.

Example:

[code]<meta name="keywords"content="meta总结,html meta,meta属性,meta跳转">

B. description (website content description)

Explanation: description is used to tell Search engines search for the main content of your website.

Example:

[code]<meta name="description"content="haorooms博客,html的meta总结，meta是html语言head区的一个辅助性标签。">

C, robots (robot guide)

Explanation: robots are used to tell the search Which pages need to be indexed by the robot and which pages do not need to be indexed.

The parameters of content include all, none, index, noindex, follow, and nofollow. The default is all.

Example:

[code]<meta name="robots"content="none">

The specific parameters are as follows:

The information parameter is all: the file will be retrieved, And the links on the page can be queried;

The information parameter is none: the file will not be retrieved, and the links on the page cannot be queried;

The information parameter is index: the file will be Retrieval;

The information parameter is follow: the links on the page can be queried;

The information parameter is noindex: the file will not be retrieved, but the links on the page can be queried;

The information parameter is nofollow: the file will be retrieved, but the links on the page cannot be queried;

D, author (author)

Description: Mark The author of the webpage

Example:

[code]<meta name="author"content="root,root@xxxx.com">

E、generator

[code]<meta name="generator"content="信息参数"/>

# The information parameter of the generator of the ##meta tag represents the software used to create the website.


F, COPYRIGHT

[code]<META NAME="COPYRIGHT"CONTENT="信息参数">

The COPYRIGHT information parameter of the meta tag represents the copyright information of the website.


G, revisit-after

[code]<META name="revisit-after"CONTENT="7days">

revisit-after represents website revisit, 7days represents 7 days, and so on.

2. http-equiv attribute

http-equiv, as the name suggests, is equivalent to the file header function of http. It can return some useful information to the browser to Helps to display web page content correctly and accurately. The corresponding attribute value is content. The content in content is actually the variable value of each parameter. The syntax format of the http-equiv attribute of the

meta tag is:

[code]<meta http-equiv="参数"content="参数变量值">；

The http-equiv attribute mainly has the following parameters:


A. Expires
Description: Can be used to set the expiration time of the web page. Once a web page expires, it must be retransmitted to the server.

Usage:

[code]<meta http-equiv="expires"content="Fri,12Jan200118:18:18GMT">

Note: GMT time format must be used.


B. Pragma (cache mode)
Description: Prohibit the browser from accessing page content from the cache of the local computer.

Usage:

[code]<meta http-equiv="Pragma"content="no-cache">

Note: With this setting, visitors will not be able to browse offline.


C. Refresh
Description: Automatically refresh and point to the new page.

Usage:

[code]<meta http-equiv="Refresh"content="2;URL=http://www.haorooms.com"> //(注意后面的引号，分别在秒数的前面和网址的后面)

Note: The 2 means that it will automatically refresh to the URL after staying for 2 seconds.


D. Set-Cookie (cookie setting)
Note: If the web page expires, the saved cookies will be deleted.

Usage:

[code]<meta http-equiv="Set-Cookie"content="cookie value=xxx;expires=Friday,12-Jan-200118:18:18GMT；path=/">

Note: GMT time format must be used.


E. Window-target (display window setting)
Description: Force the page to be displayed as an independent page in the current window.

Usage:

[code]<meta http-equiv="Window-target"content="_top">

Note: Used to prevent others from calling your own page in the frame.


F, content-Type (display character set setting)
Description: Set the character set used by the page.

usage:

[code]<meta http-equiv="content-Type"content="text/html;charset=gb2312">

具体如下：

meta标签的charset的信息参数如GB2312时，代表说明网站是采用的编码是简体中文；

meta标签的charset的信息参数如BIG5时，代表说明网站是采用的编码是繁体中文；

meta标签的charset的信息参数如iso-2022-jp时，代表说明网站是采用的编码是日文；

meta标签的charset的信息参数如ks_c_5601时，代表说明网站是采用的编码是韩文；

meta标签的charset的信息参数如ISO-8859-1时，代表说明网站是采用的编码是英文；

meta标签的charset的信息参数如UTF-8时，代表世界通用的语言编码；

G、content-Language（显示语言的设定）

用法：

[code]<meta http-equiv="Content-Language"content="zh-cn"/>

H、Cache-Control指定请求和响应遵循的缓存机制。

Cache-Control指定请求和响应遵循的缓存机制。在请求消息或响应消息中设置Cache-Control并不会修改另一个消息处理过程中的缓存处理过程。请求时的缓存指令包括no-cache、no-store、max-age、max-stale、min-fresh、on

ly-if-cached，响应消息中的指令包括public、private、no-cache、no-store、no-transform、must-revalidate、proxy-revalidate、max-age。各个消息中的指令含义如下

Public指示响应可被任何缓存区缓存

Private指示对于单个用户的整个或部分响应消息，不能被共享缓存处理。这允许服务器仅仅描述当用户的部分响应消息，此响应消息对于其他用户的请求无效

no-cache指示请求或响应消息不能缓存

no-store用于防止重要的信息被无意的发布。在请求消息中发送将使得请求和响应消息都不使用缓存。

max-age指示客户机可以接收生存期不大于指定时间（以秒为单位）的响应

min-fresh指示客户机可以接收响应时间小于当前时间加上指定时间的响应

max-stale指示客户机可以接收超出超时期间的响应消息。如果指定max-stale消息的值，那么客户机可以接收超出超时期指定值之内的响应消息。

J、http-equiv="imagetoolbar"

[code]<meta http-equiv="imagetoolbar"content="false"/>

指定是否显示图片工具栏，当为false代表不显示，当为true代表显示。

K、Content-Script-Type

[code]<Meta http-equiv="Content-Script-Type"Content="text/javascript">

W3C网页规范，指明页面中脚本的类型。

L 页面跳转，只用于IE

具体请看 http://www.haorooms.com/post/liulanq_think_ie

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