本篇文章给大家带来的内容是关于什么是head标签 ？html中head标签的介绍，有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
什么是head标签
head 标签是
元素的内容。不像 元素的内容可以显示在浏览器中，head 的内容不会在浏览器中显示，它的作用是包含一些页面的元数据。在下面的例子中，head 的内容很少。
<head>
<meta charset="utf-8">
<title>My test page</title>
</head>
登录后复制
title
元素
是用来表示整个HTML文档大致内容的元数据(不是文档的内容.)<br>元素 <title> 也被以其他的方式使用着. 比如说，如果你尝试为某个页面添加书签，(Bookmarks > Bookmark This Page, 在火狐浏览器中), 你会看到 <title> 的内容被作为建议的书签名.</p>
<h2 id="元数据-lt-meta-gt">元数据<meta></h2>
<p>元数据就是描述数据的数据，而HTML有一个“官方的”方式来为一个文档添加元数据，—— <meta> 元素. 当然，其他在这篇文章中提到的东西也可以被当作元数据。 有很多不同种类的 <meta> 元素可以被包含进你的页面的<head>元素, 但是现在我们还不会尝试去解释所有类型, 这只会引起混乱。</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta charset="utf-8"></pre><div class="contentsignin">登录后复制</div></div>
<ul class=" list-paddingleft-2"><li><p>这个元素简单的指定了文档的字符编码 —— 在这个文档中被允许使用的字符集。 utf-8<br> 是一个通用的字符集，它包含了任何人类语言中的大部分的字符。 这意味着你的web页面可以显示任意的语言; 许多<meta><br> 元素包含了name 和 content 特性.</p></li></ul>
<p>name 特性指定了meta 元素的类型; 说明该元素包含了什么类型的信息。<br>content 指定了实际的元数据内容。<br>这两个meta 元素对于定义你的页面的作者和提供页面的内容描述是很有用的 。</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="author" content="Chris Mills">
<meta name="description" content="The MDN Learning Area aims to provide
complete beginners to the Web with all they need to know to get
started with developing web sites and applications."></pre><div class="contentsignin">登录后复制</div></div>
<ul class=" list-paddingleft-2"><li><p>指定作者在某些情况下是很有用的：如果你需要联系页面的作者，问一些关于页面内容的问题。<br> 一些内容管理系统能够自动获取页面作者的信息，然后用于某种目的。<br> 指定包含关于页面内容的关键字的页面内容的描述是很有用的，因为它可能或让你的页面在搜索引擎的相关的搜索出现得更多 (这些行为术语上被称为<br> Search Engine Optimization, or SEO.)</p></li></ul>
<h2 id="在你的站点增加自定义图标">在你的站点增加自定义图标</h2>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="shortcut icon" href="favicon.ico" type="image/x-icon"></pre><div class="contentsignin">登录后复制</div></div>
<h2 id="在HTML中应用CSS和JavaScript">在HTML中应用CSS和JavaScript</h2>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="stylesheet" href="my-css-file.css"></pre><div class="contentsignin">登录后复制</div></div>
<ul class=" list-paddingleft-2"><li><p><link> 元素经常位于文档的头部，它有2个属性， rel="stylesheet"，表明这是文档的样式表，而<br> href,包含了样式表文件的路径。</p></li></ul>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><script src="my-js-file.js"></script></pre><div class="contentsignin">登录后复制</div></div>
<ul class=" list-paddingleft-2"><li><p><script> 部分没必要非要放在文档头部; 实际上，把它放在文档的尾部（在 </body>标签之前）是一个更好的选择<br> ，这样可以确保在加载脚本之前浏览器已经解析了HTML内容（如果脚本加载某个不存在的元素，浏览器会报错）。</p></li></ul>
<h2 id="为文档设定主语言">为文档设定主语言</h2>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><html lang="en-US"></pre><div class="contentsignin">登录后复制</div></div>
<ul class=" list-paddingleft-2"><li><p>这在很多方面都很有用。如果你的HTML文档的语言设置好了，那么你的HTML文档就会被搜索引擎更有效地索引<br> (例如，允许它在特定于语言的结果中正确显示),对于那些使用屏幕阅读器的视障人士也很有用(比如,<br> 法语和英语中都有“six”这个单词，但是发音却完全不同)。</p></li></ul>
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