本篇文章给大家带来的内容是关于head标签中有什么属性？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。
head 标签里有什么？
每一个 HTML 文档中，都有一个不可或缺的标签：
，它作为一个容器，主要包含了用于描述 HTML 文档自身信息（元数据）的标签，这些标签一般不会在页面中被显示出来，大多情况下是给浏览器和搜索引擎看的。
可以用在
里面的标签有：
, <base> , <link> , <style> , <meta> , <script> , <noscript> 。</p>
<p style="white-space: normal;">元信息标签介绍</p>
<p style="white-space: normal;"><title></p>
<p>定义文档的标题，显示在浏览器的标题栏或标签页上，一般会完整地概括整个网页的内容。</p>
<p style="white-space: normal;"><base></p>
<p>给页面上所有相对 URL 的提供一个基础。一份文档中只能有一个 <base> 标签。</p>
<p>目前我只观察到「淘宝网」使用了这个标签。</p>
<p style="white-space: normal;"><link></p>
<p>规定外部资源与当前文档的关系，常于链接样式表，如下所示：</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="stylesheet" href="xxx.css" type="text/css"></pre><div class="contentsignin">登录后复制</div></div>
<p>当然还有很多其他的作用：</p>
<ol><li>比如用于 SEO，主要给搜索引擎看的：</li></ol>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="canonical" href="..."></pre><div class="contentsignin">登录后复制</div></div>
<p>在网站中常有多个 url 指向同一个页面的情况，上述标签告知搜索引擎页面的主 url 是什么，以便搜索引擎保留主要页面而去除其他重复页面。</p>
<ol><li>提供 rss 订阅的：</li></ol>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="alternate" type="application/rss+xml" title="RSS" href="..."></pre><div class="contentsignin">登录后复制</div></div>
<p>上述标签除搜索引擎可以看懂以外，也能被很多浏览器插件识别。</p>
<ol><li>表示页面 icon 的：</li></ol>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="icon" href="https://xxx.png"></pre><div class="contentsignin">登录后复制</div></div>
<p>多数浏览器会读取这个 link 的资源并展示在页面上。</p>
<ol><li>对页面提供预处理的：</li></ol>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="dns-prefetch" href="//xxx.com"></pre><div class="contentsignin">登录后复制</div></div>
<p>提前对一个域名做 dns 查询。强制对域名进行预读取在有的情况下很有用,。</p>
<p>比如, 在网站的主页上，强制在整个网站上对频繁引用的域名做预解析处理，即使它们不在主页本身上使用。虽然主页的性能可能不受影响，但是会提高站点整体性能。</p>
<p><style></p>
<p>包含文档的样式信息。</p>
<p><meta></p>
<p>一种通用的元数据信息表示标签，一般以键值对出现，如：<meta name="xxx" content="yyy"></p>
<p>charset 属性</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>
<p>从 HTML5 开始，上述写法被推荐使用，用于声明当前文档所使用的字符编码，推荐放在 <head> 中的第一位。</p>
<p style="white-space: normal;">http-equiv属性</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta http-equiv="content-type" content="text/html; charset=UTF-8"></pre><div class="contentsignin">登录后复制</div></div>
<p>在 HTML4 中，上述代码用于声明字符集，但是现在已不被推荐。</p>
<p>除了 content-type ，还有其他几个值：</p>
<p>content-language （已过时）、set-cookie （已过时）、default-style 、refresh 、content-security-policy</p>
<p>因为不常用，所以就不一一介绍了，也挺容易理解，感兴趣可以点击 这里 了解。</p>
<p style="white-space: normal;">name 属性</p>
<p>其实 <meta> 标签可以被自由定义，只要读取和写入的双方约定好 name 和 content 的格式就可以了。来看一个例子：</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"></pre><div class="contentsignin">登录后复制</div></div>
<p>上面这种用法并不在 HTML 标准中，但是却移动端开发的事实标准。这里来解释一下 content 中的内容：</p>
<p>width ：页面宽度，可以是一个正整数；也可以一个字符串 "device-width" ，表示跟设备宽度相等。height ：页面高度，可以是一个正整数；也可以一个字符串 "device-height" ，表示跟设备高度相等。initial-scale ：初始缩放比例。minimum-scale ： 最小缩放比例。maximum-scale ： 最大缩放比例。user-scalable ：是否允许用户缩放。</p>
<p>name 属性的值除了可以是 viewport 之外，还有相当多的值：</p>
<p>application-name 、author 、description 、generator 、keywords 、referrer 、robots 等。</p>
<p>同样的，就不一一介绍了，感兴趣可以点击 这里 了解。</p>
<p><script></p>
<p>用于嵌入或引用可执行脚本。来看几个 script 标签常见的全局属性：</p>
<p>async</p>
<p>使浏览器使用另一个线程下载脚本，这时不会阻塞页面渲染。当脚本下载完成后，浏览器会暂停渲染，执行脚本，执行完毕后继续渲染页面。</p>
<p>async 无法保证脚本的执行顺序，哪个脚本先下载结束就会先执行。</p>
<p>defer</p>
<p>同样会使浏览器并行下载脚本，但是下载完毕不会立即执行，而是会等到 DOM 加载完成后（即刚刚读取完 </html> 标签）再执行脚本。</p>
<p>defer 可以保证脚本的执行顺序就是它们在页面上出现的顺序。</p>
<p>src</p>
<p>定义引用外部脚本的地址，指定此属性的 script 标签内不应再有嵌入的脚本。如果脚本文件使用了非英语字符，还应该注明字符的编码。如：</p>
<p><script charset="utf-8" src="https://www.example.com/script.js"></script><br>type</p>
<p>默认值是 text/javascript</p>
<p>想了解更多关于 <script> 标签的详细内容可以点击 这里 。</p>
<p><noscript></p>
<p>如果页面上的脚本类型不受支持或者当前在浏览器中关闭了脚本，则在此中定义脚本未被执行时的替代内容。</p>
<p>总结</p>
<p>本文到这里就结束了，其实关于 link 和 meta 标签还有很多没有介绍到，很多相关标签都是有特殊的需求，只有在特定情况下才会使用，比如移动端开发就会用许多在 PC 上并不需要的标签。</p>
<p>当然平时使用也主要是看需求，就拿我目前来说，只是些许用到过一些与 viewport 和 SEO 相关的标签。</p>
<p>鉴于此我推荐一个不错的学习方法，就是去各大网站查看它们的 head 标签里都有什么，遇到没见过的就去搜索一下，熟悉起来会很快。</p>
<p>我这边看过的网站有：「淘宝网」、「阿里巴巴」、「京东」、「网易严选」、「起点中文网」等。</p>
<p>本篇文章到这里就已经全部结束了，更多其他精彩内容可以关注PHP中文网的<a href="http://www.php.cn/course/list/11.html" target="_blank">HTML教程视频</a>栏目！</p>
<p></p><p>以上是head标签中有什么属性？的详细内容。更多信息请关注PHP中文网其他相关文章！</p>
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