请看下面的详细讲解。
HTML 网页头部代码全清楚
网页头部代码也被称为 head 部分，它包含了很多信息，如标题、脚本、CSS样式等，这些信息都对网页有着非常重要的作用。下面，我们就来一步一步详细讲解头部代码的组成。
文档类型声明
文档类型声明告诉浏览器当前页面使用的是哪种 HTML 版本。在头部代码中，通常写法如下：
<!DOCTYPE html>
注意，该声明必须是文档的第一行。
HTML 根元素
HTML 根元素指的是 标签，它告诉浏览器文档开始了。在 标签中，可以通过 lang 属性指定文档使用的语言，如：
<html lang="en-us">
网页标题
网页标题位于头部代码中的
标签内，它对搜索引擎的优化有着很大的影响。以下是一个标题标签的示例：</p>
<pre><code><title>这是网页标题</title>
</code></pre>
<h3>CSS 样式表</h3>
<p>在 HTML 的头部代码中，通过 <link> 标签指定使用的 CSS 样式表，其写法如下：</p>
<pre><code><link rel="stylesheet" href="style.css">
</code></pre>
<h3>JavaScript 脚本</h3>
<p>同样是通过 <link> 标签引入外部文件，只不过 href 属性变成了 src，示例代码如下：</p>
<pre><code><script src="index.js"></script>
</code></pre>
<h3>其他头信息</h3>
<p>还有一些其他的头信息，比如字符编码、网站描述等，可以通过以下方式指定：</p>
<pre><code><meta charset="UTF-8">
<meta name="description" content="这是对网站的简短描述">
</code></pre>
<p>要注意的是，头部代码中还可以包含其他的标签和属性，具体情况可以根据需要添加。</p>
<h3>示例说明</h3>
<p>下面，我们通过两个示例来演示头部代码的写法。</p>
<h4>示例一：</h4>
<pre><code><!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="UTF-8">
<meta name="description" content="这是一个例子">
<title>示例网站</title>
<link rel="stylesheet" href="style.css">
<script src="index.js"></script>
</head>
<body>
<h1>这是一个示例网站</h1>
<p>这是一个示例段落</p>
</body>
</html>
</code></pre>
<h4>示例二：</h4>
<pre><code><!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="description" content="这是另一个例子">
<title>另一个示例网站</title>
<link rel="stylesheet" href="style.css">
<script src="index.js"></script>
</head>
<body>
<h1>这是另一个示例网站</h1>
<p>这是另一个示例段落</p>
</body>
</html>
</code></pre>
<p>以上就是关于 HTML 网页头部代码的完整攻略，希望对你有所帮助。</p>
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