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html5的头部标记有哪些

青灯夜游

Dec 17, 2021 am 11:24 AM

html5

html5的头部标记有：1、“”；2、“”；3、“<base>”；4、“<link>”；5、“<style>”；6、“<meta>”；7、“<script>”；8、“<noscript>”。</p></blockquote> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/202112/17/2021121711215988732.jpg" class="lazy" alt="html5的头部标记有哪些" ></p> <p>本教程操作环境：windows7系统、HTML5版、Dell G3电脑。</p> <h2 id="strong-html-的头部标记-strong"><strong>html5的头部标记</strong></h2> <p><strong>1、<head>标签</strong></p> <p><head> 标签是所有头部标签的容器，这些头部标签用来定义有关 HTML 文档的元数据（描述数据的数据）以及所需资源的引用（例如 CSS 样式文件、JavaScript 脚本文件），对文档能够在浏览器中正确显示起到了非常重要的作用。根据我们的需求，可以在 HTML 头部定义大量的元数据，也可以定义很少或者根本就不定义。虽然头部标签是 HTML 文档的一部分，但其中的内容并不会显示在浏览器中。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> .... </head></pre><div class="contentsignin">登录后复制</div></div><p><strong>2、<title> 标签</strong></p><p><title> 标签用来定义 HTML 文档的标题，只有包含 <title> 标签的文档才算是一个有效的 HTML 文档。另外，一个 HTML 文档中仅允许存在一个 <title> 标签，并且 <title> 标签必须放置在 <head> 标签中。</p><p>注意，在 <title> 标签内部仅允许包含纯文本内容，不能包含其他 HTML 标签。</p><p><title> 标签的主要作用如下所示：</p><ul style="list-style-type: disc;"><li><p>在浏览器标题栏或者任务栏中显示标题；</p></li><li><p>当将页面添加到收藏夹（书签）时提供标题；</p></li><li><p>在搜索结果中显示页面标题。</p></li></ul><p>下面的示例演示了如何在 HTML 文档中使用 <title> 标签：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> <meta charset="utf-8"> <title>php中文网-教程_手册_视频-免费php在线学习平台</title> </head></pre><div class="contentsignin">登录后复制</div></div><p><title> 标签的内容必须与当前文档有关，并且不应该过长，中文页面请尽量控制在 30 个字符（包括空格）以内。</p><p><strong>3、<base> 标签</strong></p><p><base> 标签用于为页面中所有相对链接指定一个基本链接，当您设置了基本链接后，当前页面中的所有相对链接都会使用这个基本链接作为前缀，如下例所示：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title><base>标签演示</title> <base href="https://www.php.cn/"> </head> <body> <ul> <li><a href="course.html">视频教程</a></li> <li><a href="course/type/3.html">入门教程</a></li> </ul> </body> </html></pre><div class="contentsignin">登录后复制</div></div><p>上面的示例中第一个 <li> 标签中的超链接会被解析为“https://www.php.cn/course.html”，第二个 <li> 中的超链接会被解析为“https://www.php.cn/course/type/3.html”。</p><p>注意，HTML 文档中的 <base> 标签必须出现在任何引用外部资源的标签之前，而且一个 HTML 文档中仅允许定义一个 <base> 标签。</p><p><strong>4、<link> 标签</strong></p><p><link> 标签经常用于引用外部 CSS 样式表，<link> 标签中包含两个主要的属性，分别是 rel 和 href。rel 属性用来指示引用文件的类型，href 属性用来设置外部文件的路径。示例代码如下：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> <title>此处书写标题</title> <link rel="stylesheet" href="common.css"> </head></pre><div class="contentsignin">登录后复制</div></div><p>HTML <head> 标签中可以包含任意数量的 <link> 标签。</p><p><strong>5、<style>标签</strong></p><p>使用 <style> 标签可以在 HTML 文档中嵌入 CSS 样式，需要注意的是在 <style> 标签中定义的样式仅对当前 HTML 文档有效。示例代码如下：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> <title>此处书写标题</title> <style> body { background-color: YellowGreen; } h1 { color: red; } p { color: green; } </style> </head></pre><div class="contentsignin">登录后复制</div></div><p>注意：对于文档中的唯一样式可以使用 <style> 标签，但对于在多个文档中通用的样式，使用外部样式表更为合适。关于在 HTML 中嵌入 CSS 的更多内容，请转到《HTML嵌入CSS样式（四种方法）》。</p><p><strong>6、<meta> 标签</strong></p><p><meta> 标签用于提供有关 HTML 文档的元数据，例如页面有效期、页面作者、关键字列表、页面描述等信息。<meta> 标签定义的数据并不会显示在页面上，但却会被浏览器解析。</p><p>1) 定义字符集</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>charset 属性用来指定 HTML 文档的字符编码，上面的示例中，我们将文档的字符编码设置为了“UTF-8”。</p><p>2) 定义页面描述</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><meta name="description" content="php中文网提供大量免费、原创、高清的php视频教程，并定期举行公益php培训！可边学习边在线修改示例代码，查看执行效果！php从入门到精通，一站式php自学平台！"></pre><div class="contentsignin">登录后复制</div></div><p>定义页面的描述信息有利于搜索引擎的搜索。</p><blockquote><p><title> 标签定义文档标题，name="description" 定义文档描述，描述的长度通常大于标题。</p></blockquote><p>3) 定义关键字</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><meta name="keywords" content="php教程,php入门教程,php视频教程,php源码下载,php手册"></pre><div class="contentsignin">登录后复制</div></div><p>关键字用于为搜索引擎提供与页面有关的信息。</p><p>4) 定义页面作者</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><meta name="author" content="PHP中文网"></pre><div class="contentsignin">登录后复制</div></div><p>通过某些内容管理系统可以自动提取作者信息。</p><p>5) 刷新页面</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><meta http-equiv="refresh" content="30"></pre><div class="contentsignin">登录后复制</div></div><p>上例中的代码用于向浏览器发送一个指令，使浏览器在经过指定的时间间隔（30 秒）后自动刷新页面。在 content 属性中除了可以指定时间间隔外，还可以再指定一个链接，这时页面将在指定的时间后重定向到链接所指向的页面，如下例所示：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><meta http-equiv="refresh" content="10; url=https://www.php.cn/"></pre><div class="contentsignin">登录后复制</div></div><p><strong>7、<script> 标签</strong></p><p><script> 标签用于定义 JavaScript 脚本，示例代码如下：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> <title>PHP中文网</title> <script> document.write("PHP中文网") </script> </head></pre><div class="contentsignin">登录后复制</div></div><p><strong>8、<noscript> 标签</strong></p><p>当用户的浏览器不支持 JavaScript 脚本或者禁用 JavaScript 脚本时，可以在 <noscript> 标签中定义一些内容来替代不能运行的 JavaScript 脚本或者给用户一些提示。除了 <script> 标签外，在 <noscript> 标签中可以包含任何 HTML 元素，如下例所示：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><head> <title>PHP中文网</title> <noscript> <p>您的浏览器不支持 JavaScript 或者您禁用了 JavaScript，请<a href="https://www.php.cn/">点击这里</a>了解如何启用 JavaScript。</p> </noscript> </head></pre><div class="contentsignin">登录后复制</div></div><p>相关推荐：《<a href="http://www.php.cn/course/list/11.html" target="_blank" textvalue="html视频教程">html视频教程</a>》</p><p>以上是html5的头部标记有哪些的详细内容。更多信息请关注PHP中文网其他相关文章！</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">本站声明</div> <div>本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn</div> </div> </div> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-5902227090019525" data-ad-slot="2507867629"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); 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