<Meta> element must be placed in <head> tags, and must be written in the HTML file within the first 1024B
The main purpose of <meta> element is to provide relevant information on this HTML document. Encoding e.g., author information, keyword information, or redirect URL to direct the user to another URL like.
A <head> tag within the plurality <meta> element is present.
The following is reproduced from https://www.jianshu.com/p/6549bec5d0e1
The role of meta tags
- Search engines (SEO) optimization;
- Define the page language;
- Automatic refresh the page;
- Control the page cache;
- Web page classification evaluation;
- Control page window display;
- and many more...
Use meta
<meta>There are three tag attributes, different attributes and values make up a different page functions:
- name
- http-equiv
- content
The name attribute
nameThe main attribute is used to describe a web page, the corresponding contentcontent attribute is to facilitate the search engines to find and categorize information. grammar:
<meta name="" content="" /> name="keywords"
It is used to set, let search engine to find keyword page:
<meta name="keywords" content="活动,聚会，拓展，团建，培训，讲座" /> name="description"
It is used to set, let search engines access to content pages of description:
<meta name="description" content="百场汇是中国最大的会议活动和工作场地短租平台，提供场地直销服务，价格超低，无任何附加费用，帮助用户寻找各种各样的特色场地。" /> name="robots"
It is used to set, let search engines which pages to index, which does not require an index page. contentIt has the following parameters:
- all: the file will be retrieved, and the links on the page can be inquiries;
- none: document will not be retrieved, and the links on the page can not be queried;
- index: files will be retrieved;
- noindex: document will not be retrieved, but the links on the page can be inquiries;
- follow: a link on the page can be inquiries;
- nofollow: document will be retrieved, but the link on the page can not be queried.
<meta name="robots" content="all" /> name="author"
It is the author sets the page:
<meta name="author" content="jay" /> name="generator"
It is to set up the site using what software to make:
<meta name="generator" content="hobbit" /> name="COPYRIGHT"
It is to set the copyright information of the website:
<meta name="COPYRIGHT" content="百场汇" /> name="revisit-after"
It is set to revisit the site, 30dayon behalf of 30 days:
<meta name="revisit-after" content="30day" /> name="viewport"
It is used to control the browser window size and scale, since it in modern browsers, especially the Mobile client browser is very common, we will use a dedicated an article to explain it:
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" /> http-equiv attribute
http-equivHTTP is equivalent to setting the file header. grammar:
<meta http-equiv="" content="" /> http-equiv="expires"
It is to set the expiration time of the page:
<meta http-equiv="expires" content="Fri May 13 2016 22:49:44 GMT+0800 (CST)" /> http-equiv="Pragma"
It is prohibited to set the browser to access the page from the local cache:
<meta http-equiv="Pragma" content="no-cache" /> http-equiv="Refresh"
It is set to automatically refresh and jump to a new page where contentthe first number represents five seconds automatically refresh:
<meta http-equiv="Refresh" content="5;URL=http://m.baichanghui.com" /> http-equiv="Set-Cookie"
It is set to Cookie's:
<meta http-equiv="Set-Cookie" content="cookie value=xxx;expires=Friday,12-Jan-200118:18:18GMT；path=/" /> http-equiv="content-Type"
It is to set the character set used by page:
<meta http-equiv="content-Type" content="text/html;charset=gb2312" /> http-equiv="Content-Language"
It is to set the page language:
<meta http-equiv="Content-Language" content="zh-cn" />