移动前端不得不了解的HTML5 head 头标签（中下篇）

SEO 优化部分

页面标题<title>标签(head 头部必须)
        <title>your title</title>
    页面关键词 keywords
        <meta name="keywords" content="your keywords">
    页面描述内容 description
        <meta name="description" content="your description">
    定义网页作者 author
        <meta name="author" content="author,email address">
    定义网页搜索引擎索引方式，robotterms 是一组使用英文逗号「,」分割的值，通常有如下几种取值：none，noindex，nofollow，all，index和follow。
        <meta name="robots" content="index,follow">

百度禁止转码

通过百度手机打开网页时，百度可能会对你的网页进行转码，往你的身上贴狗皮膏药的广告，为此可在 head 内添加

link 标签

说到 link 标签，估计大家的第一反应和我一样，就是引入外部CSS样式文件的，不错，这是 link 标签最最常用的功能。不过它还有很多别的用处，比如这是浏览器 favicon 图标，touch图标等等。

<link rel="canonical" href="https://example.com/2010/06/9-things-to-do-before-entering-social-media.html">
    
    <link rel="shortlink" href="https://example.com/?p=42">
    
    <link rel="amphtml" href="https://example.com/path/to/amp-version.html">
    
    <link rel="stylesheet" href="https://example.com/styles.css">
    
    <link rel="manifest" href="manifest.json">
    
    <link rel="author" href="humans.txt">
    
    <link rel="copyright" href="copyright.html">
    
    <link rel="alternate" href="https://es.example.com/" hreflang="es">
    
    <link rel="me" href="https://google.com/profiles/thenextweb" type="text/html">
    <link rel="me" href="mailto:name@example.com">
    <link rel="me" href="sms:+15035550125">
    
    <link rel="archives" href="https://example.com/2003/05/" title="May 2003">
    
    <link rel="index" href="https://example.com/" title="DeWitt Clinton">
    
    <link rel="start" href="https://example.com/photos/pattern_recognition_1_about/" title="Pattern Recognition 1">
    
    <link rel="prev" href="https://example.com/opensearch/opensearch-and-openid-a-sure-way-to-get-my-attention/" title="OpenSearch and OpenID? A sure way to get my attention.">
    
    <link rel="self" type="application/atom+xml" href="https://example.com/atomFeed.php?page=3">
    
    <link rel="first" href="https://example.com/atomFeed.php">
    <link rel="next" href="https://example.com/atomFeed.php?page=4">
    <link rel="previous" href="https://example.com/atomFeed.php?page=2">
    <link rel="last" href="https://example.com/atomFeed.php?page=147">
    
    <link rel="EditURI" href="https://example.com/xmlrpc.php?rsd" type="application/rsd+xml" title="RSD">
    
    <link rel="pingback" href="https://example.com/xmlrpc.php">
    
    <link rel="webmention" href="https://example.com/webmention">
    
    <link rel="import" href="component.html">
    
    <link rel="search" href="/open-search.xml" type="application/opensearchdescription+xml" title="Search Title">
    
    <link rel="alternate" href="https://feeds.feedburner.com/example" type="application/rss+xml" title="RSS">
    <link rel="alternate" href="https://example.com/feed.atom" type="application/atom+xml" title="Atom 0.3">
    
    <link rel="dns-prefetch" href="//example.com/">
    <link rel="preconnect" href="https://www.example.com/">
    <link rel="prefetch" href="https://www.example.com/">
    <link rel="prerender" href="https://example.com/">
    <link rel="preload" href="image.png" as="image">

不推荐的link标签

rss订阅

<link rel="alternate" type="application/rss+xml" title="RSS" href="/rss.xml" />

 <!-- 添加 RSS 订阅 -->

favicon 图标

IE 11, Chrome, Firefox, Safari, Opera支持<link>形式设置：
<link rel="icon" href="path/to/favicon-16.png" sizes="16x16" type="image/png">
<link rel="icon" href="path/to/favicon-32.png" sizes="32x32" type="image/png">
<link rel="icon" href="path/to/favicon-48.png" sizes="48x48" type="image/png">
<link rel="icon" href="path/to/favicon-62.png" sizes="62x62" type="image/png">
<link rel="icon" href="path/to/favicon-192.png" sizes="192x192" type="image/png">

注意：对于IE 10及以下版本不支持<link>形式设置，只通过将命名为favicon.ico的文件放置在网站根目录中实现。

比较详细的 favicon 介绍可参考：