HTML（HyperText Markup Language）的基本结构包括以下几个主要部分：
：文档类型声明，它告诉浏览器文档采用哪个HTML版本。通常位于HTML文档的开头，以确保浏览器正确解释文档。
：HTML文档的根元素。它包含了整个HTML文档的内容，并定义了文档的开始和结束。
：文档头部部分，用于包含与文档相关的元信息（meta-information），通常不会在网页中直接显示给用户。常见的内容包括：
</code>：定义网页的标题，显示在浏览器标签页上。</li><li><code><link></code>：引入外部样式表文件（CSS）。</li><li><code><script></code>：引入外部JavaScript文件或内部脚本。</li></ul> </li><li> <p><code><body></code>：HTML文档的主体部分，包含了页面的可见内容，如文本、图像、链接等。用户访问网页时，这部分内容会在浏览器中呈现。</p> </li></ol>
<p>基本的HTML文档结构如下所示：</p>
<pre data-index="0" class="set-code-hide prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>en<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>UTF-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>网页标题<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>viewport<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>width=device-width, initial-scale=1.0<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stylesheet<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text/css<span class="token punctuation">"</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>styles.css<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>script.js<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>这是一个标题<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>这是一个段落。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>图片<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>https://www.example.com<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>这是一个链接<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li><li style="color: rgb(153, 153, 153);">12</li><li style="color: rgb(153, 153, 153);">13</li><li style="color: rgb(153, 153, 153);">14</li><li style="color: rgb(153, 153, 153);">15</li><li style="color: rgb(153, 153, 153);">16</li></ul></pre>
<p>这是一个简单的HTML文档示例。HTML文档的结构和内容会根据具体的需求和设计而有所不同，但上述基本结构是HTML文档的核心部分，它为网页提供了基本的框架。</p>
<h3><a name="t2"></a><a id="HTML_38"></a>HTML元素</h3>
<p>HTML（Hypertext Markup Language）中有许多不同类型的元素，它们用于构建网页的结构和内容。以下是一些常见的HTML元素：</p>
<ol><li> <p><strong>标题元素</strong>：</p>
<ul><li> <p><code><h1></code>, <code><h2></code>, <code><h3></code>, <code><h4></code>, <code><h5></code>, <code><h6></code>：定义标题，按重要性递减。</p> </li><li> <p><strong>标题元素 <code><h1></code> 到 <code><h6></code></strong>：用于定义标题，从 <code><h1></code>（最高级别）到 <code><h6></code>（最低级别）。</p> <pre data-index="1" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>这是一个主标题<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>这是一个次级标题<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li></ul></pre> </li></ul> </li><li> <p><strong>段落元素</strong>：</p>
<ul><li> <p><code><p></code>：定义文本段落。</p> </li><li> <p><strong>段落元素 <code><p></code></strong>：用于定义文本段落。</p> <pre data-index="2" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>这是一个段落。段落是用来组织文本的基本单位。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li></ul></pre> </li></ul> </li><li> <p><strong>链接元素</strong>：</p>
<ul><li> <p><code><a></code>：创建<a href="https://so.csdn.net/so/search?q=%E8%B6%85%E9%93%BE%E6%8E%A5&spm=1001.2101.3001.7020" target="_blank" class="hl hl-1" data-report-view="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E8%B6%85%E9%93%BE%E6%8E%A5&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"超链接\"}"}" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E8%B6%85%E9%93%BE%E6%8E%A5&spm=1001.2101.3001.7020","extra":"{\"searchword\":\"超链接\"}"}" data-tit="超链接" data-pretit="超链接">超链接</a>到其他页面或资源。</p> </li><li> <p><strong>链接元素 <code><a></code></strong>：用于创建超链接到其他页面或资源。</p> <pre data-index="3" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>https://www.example.com<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>访问示例网站<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li></ul></pre> </li></ul> </li><li> <p><strong>图像元素</strong>：</p>
<ul><li> <p><code><img></code>：嵌入图像。</p> </li><li> <p><strong>图像元素 <code><img></code></strong>：用于嵌入图像。</p> <pre data-index="4" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>图片描述<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li></ul></pre> </li></ul> </li><li> <p><strong>列表元素</strong>：</p>
<ul><li> <p><code><ul></code>：创建无序列表。</p> </li><li> <p><code><ol></code>：创建有序列表。</p> </li><li> <p><code><li></code>：定义列表项。</p> </li><li> <p><strong>列表元素 <code><ul></code> 和 <code><ol></code></strong>：用于创建无序列表和有序列表。</p> <pre data-index="5" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>无序列表项 1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>无序列表项 2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ol</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>有序列表项 1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>有序列表项 2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ol</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li></ul></pre> </li></ul> </li><li> <p><strong>定义列表元素</strong>：</p>
<ul><li><code><dl></code>：创建定义列表。</li><li><code><dt></code>：定义术语。</li><li><code><dd></code>：定义术语的描述。</li><li><strong>定义列表元素 <code><dl></code>、<code><dt></code> 和 <code><dd></code></strong>：用于创建术语和其描述的定义列表。<pre data-index="6" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dl</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dt</span><span class="token punctuation">></span></span>术语1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dt</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dd</span><span class="token punctuation">></span></span>术语1的定义。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dd</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dt</span><span class="token punctuation">></span></span>术语2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dt</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dd</span><span class="token punctuation">></span></span>术语2的定义。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dd</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dl</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li></ul></pre> </li></ul> </li><li> <p><strong>表格元素</strong>：</p>
<ul><li> <p><code><table></code>：创建表格。</p> </li><li> <p><code><tr></code>：定义表格行。</p> </li><li> <p><code><td></code>：定义表格数据单元格。</p> </li><li> <p><code><th></code>：定义表格标题单元格。</p> </li><li> <p><code><caption></code>：为表格添加标题。</p> </li><li> <p><strong>表格元素 <code><table></code>、<code><tr></code>、<code><td></code> 和 <code><th></code></strong>：用于创建表格。</p> <pre data-index="7" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>table</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>th</span><span class="token punctuation">></span></span>表头1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>th</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>th</span><span class="token punctuation">></span></span>表头2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>th</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>数据1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>数据2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>table</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li></ul></pre> </li></ul> </li><li> <p><strong>表单元素</strong>：</p>
<ul><li> <p><code><form></code>：创建用户输入表单。</p> </li><li> <p><code><input></code>：定义输入字段。</p> </li><li> <p><code><textarea></code>：创建多行文本输入框。</p> </li><li> <p><code><select></code>：创建下拉菜单。</p> </li><li> <p><code><button></code>：创建按钮。</p> </li><li> <p><code><label></code>：为表单元素添加标签。</p> </li><li> <p><code><fieldset></code>：将相关表单元素分组。</p> </li><li> <p><code><legend></code>：为<code><fieldset></code>元素添加标题。</p> </li><li> <p><strong>表单元素 <code><form></code> 和 <code><input></code></strong>：用于创建用户输入表单和输入字段。</p> <pre data-index="8" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span> <span class="token attr-name">for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>用户名：<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>提交<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li></ul></pre> </li></ul> </li><li> <p><strong>媒体元素</strong>：</p>
<ul><li> <p><code><audio></code>：嵌入音频。</p> </li><li> <p><code><video></code>：嵌入视频。</p> </li><li> <p><code><iframe></code>：嵌入其他网页或文档。</p> </li><li> <p>HTML媒体元素用于嵌入音频和视频等多媒体内容到网页中。以下是HTML中两个主要的媒体元素的使用示例：</p>
<ol><li><strong><code><audio></code> 元素</strong>：用于嵌入音频文件。</li></ol> <pre data-index="9" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>audio</span> <span class="token attr-name">controls</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio.mp3<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio/mpeg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
Your browser does not support the audio element.
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>audio</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li></ul></pre>
<ul><li><code><audio></code> 元素包含一个或多个 <code><source></code> 元素，每个 <code><source></code> 元素指定不同格式的音频文件。浏览器会自动选择支持的格式。</li><li><code>controls</code> 属性添加音频播放器的控件，如播放按钮、音量控制等。</li><li>如果浏览器不支持 <code><audio></code> 元素或指定的音频格式，将显示后备内容。</li></ul>
<ol start="2"><li><strong><code><video></code> 元素</strong>：用于嵌入视频文件。</li></ol> <pre data-index="10" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>video</span> <span class="token attr-name">controls</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video.mp4<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video/mp4<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video.webm<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video/webm<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
Your browser does not support the video element.
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>video</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li></ul></pre>
<ul><li><code><video></code> 元素也包含一个或多个 <code><source></code> 元素，每个 <code><source></code> 元素指定不同格式的视频文件。</li><li><code>controls</code> 属性添加视频播放器的控件，允许用户播放、暂停、调整音量等。</li><li><code>width</code> 属性定义视频的宽度，可以根据需要设置。</li><li>与 <code><audio></code> 元素类似，如果浏览器不支持 <code><video></code> 元素或指定的视频格式，将显示后备内容。</li></ul> <p>请注意，以上示例中的文件路径应该根据实际的文件位置进行调整。另外，为确保广泛的浏览器兼容性，通常需要提供多个不同格式的媒体文件，以便浏览器选择支持的格式。</p> <p>媒体元素还支持其他属性，例如 <code>autoplay</code>（自动播放）、<code>loop</code>（循环播放）、<code>poster</code>（封面图像）、<code>preload</code>（预加载等），可以根据需求进行配置。如果需要更多的交互和自定义控制，可以使用JavaScript与这些元素进行交互。</p> </li></ul> </li><li> <p><strong>样式和分隔元素</strong>：</p>
<ul><li> <p><code><div></code>：用于组织和布局页面内容，通常用于CSS样式控制。</p> </li><li> <p><code><span></code>：用于内联元素，通常用于CSS样式控制。</p> </li><li> <p><code><hr></code>：创建水平线。</p> </li><li> <p><code><br></code>：插入换行符。</p> </li><li> <p><strong>样式和分隔元素 <code><div></code> 和 <code><span></code></strong>：用于组织和布局页面内容，通常用于CSS样式控制。</p> <pre data-index="11" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>container<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>这是一个<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span>元素。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span> <span class="token special-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value css language-css"><span class="token property">color</span><span class="token punctuation">:</span> red<span class="token punctuation">;</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>这是一个<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>span</span><span class="token punctuation">></span></span>元素。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>span</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li></ul></pre> </li></ul> </li><li> <p><strong>文本格式元素</strong>：</p>
<ul><li> <p><code><strong></code>：表示强调文本，通常以粗体显示。</p> </li><li> <p><code><em></code>：表示强调文本，通常以斜体显示。</p> </li><li> <p><code><code></code>：表示计算机代码。</p> </li><li> <p><code><mark></code>：高亮显示文本。</p> </li><li> <p><code><sub></code>：表示下标文本。</p> </li><li> <p><code><sup></code>：表示上标文本。</p> </li><li> <p><strong>文本格式元素 <code><strong></code> 和 <code><em></code></strong>：用于表示文本的强调。</p> <pre data-index="12" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>strong</span><span class="token punctuation">></span></span>重要信息：<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>strong</span><span class="token punctuation">></span></span>这是一个重要的内容部分。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>em</span><span class="token punctuation">></span></span>注意：<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>em</span><span class="token punctuation">></span></span>请仔细阅读说明。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li></ul></pre> </li></ul> </li><li> <p><strong>其他元素</strong>：</p>
<ul><li><code><nav></code>：定义导航链接。</li><li><code><header></code>：定义文档头部。</li><li><code><footer></code>：定义文档底部。</li><li><code><aside></code>：定义侧边栏内容。</li><li><code><main></code>：定义文档的主要内容。</li><li><code><article></code>：定义独立的文章内容。</li><li><code><section></code>：定义文档的一个部分。</li><li><strong>其他元素 <code><nav></code>、<code><header></code>、<code><footer></code>、<code><aside></code>、<code><main></code> 和 <code><article></code></strong>：用于定义页面的各个部分和结构。<pre data-index="13" class="set-code-hide prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>header</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>网站标题<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>header</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>nav</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>首页<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>关于我们<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>nav</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>main</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>主要内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>这是主要内容部分。<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>main</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>footer</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>版权所有 <span class="token entity named-entity" title="©">©</span> 2023<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>footer</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li><li style="color: rgb(153, 153, 153);">12</li><li style="color: rgb(153, 153, 153);">13</li><li style="color: rgb(153, 153, 153);">14</li><li style="color: rgb(153, 153, 153);">15</li><li style="color: rgb(153, 153, 153);">16</li><li style="color: rgb(153, 153, 153);">17</li><li style="color: rgb(153, 153, 153);">18</li><li style="color: rgb(153, 153, 153);">19</li></ul></pre> </li></ul> </li></ol>
<p>这些元素的组合和嵌套形成了网页的结构和内容。通过正确使用这些元素，可以创建有意义且易于理解的网页。</p>
<h3><a name="t3"></a><a id="HTML_248"></a>HTML表单</h3>
<p>HTML表单元素用于创建用户输入表单，以便用户可以提交数据到服务器或进行交互。以下是创建和处理HTML表单的基本步骤：</p>
<h4><a name="t4"></a><a id="HTML_251"></a>创建HTML表单元素</h4>
<ol><li><strong><code><form></code> 元素</strong>：使用 <code><form></code> 元素来定义整个表单，包括用户输入字段和提交按钮。</li></ol>
<pre data-index="14" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit.php<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token comment"><!-- 表单内容将被放置在这里 --></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>用户名<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>密码<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>提交<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li></ul></pre>
<ul><li><code>action</code> 属性定义表单提交的目标URL。</li><li><code>method</code> 属性定义提交方法，通常为 “post” 或 “get”。</li></ul>
<ol start="2"><li><strong>输入字段</strong>：使用 <code><input></code> 元素和其他元素来定义表单中的输入字段。</li></ol>
<pre data-index="15" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>用户名<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>密码<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li></ul></pre>
<ul><li><code>type</code> 属性定义输入字段的类型，如文本、密码、单选按钮等。</li><li><code>name</code> 属性定义字段的名称，用于标识字段的值。</li><li><code>placeholder</code> 属性可提供字段的占位符文本。</li></ul>
<ol start="3"><li><strong>标签元素</strong>：使用 <code><label></code> 元素来为输入字段添加标签，提高可用性。</li></ol>
<pre data-index="16" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>label</span> <span class="token attr-name">for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>用户名：<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li></ul></pre>
<ul><li><code>for</code> 属性的值应与相关输入字段的 <code>id</code> 属性相匹配，以建立关联。</li></ul>
<ol start="4"><li><strong>其他输入字段</strong>：除了文本和密码字段，还有许多其他类型的输入字段，如单选按钮、复选框、下拉列表等。</li></ol>
<pre data-index="17" class="set-code-show prettyprint"><code class="prism language-html has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>male<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 男性
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>female<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 女性
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>checkbox<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>subscribe<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>yes<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 订阅
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>select</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>country<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>us<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>美国<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ca<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>加拿大<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token comment"><!-- 其他选项 --></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>select</span><span class="token punctuation">></span></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li></ul></pre>
<h4><a name="t5"></a><a id="HTML_302"></a>处理HTML表单数据</h4>
<p>当用户提交表单时，表单数据将被发送到服务器。服务器端可以使用不同的编程语言（如PHP、Node.js、Python等）来处理和验证表单数据。</p>
<p>在服务器端，可以通过以下方式来访问和处理表单数据：</p>
<ul><li><strong>POST 方法</strong>：通过 POST 方法提交的表单数据通常在请求的正文中，可以使用服务器端脚本来解析和处理这些数据。</li></ul>
<pre data-index="18" class="set-code-show prettyprint"><code class="prism language-php has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$_SERVER</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"REQUEST_METHOD"</span><span class="token punctuation">]</span> <span class="token operator">==</span> <span class="token string double-quoted-string">"POST"</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
<span class="token variable">$username</span> <span class="token operator">=</span> <span class="token variable">$_POST</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"username"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token variable">$password</span> <span class="token operator">=</span> <span class="token variable">$_POST</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"password"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">// 进行数据验证和处理</span>
<span class="token punctuation">}</span>
<span class="token operator">?</span><span class="token operator">></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li></ul></pre>
<ul><li><strong>GET 方法</strong>：通过 GET 方法提交的表单数据通常附加在URL中，可以使用服务器端脚本来解析和处理这些数据。</li></ul>
<pre data-index="19" class="set-code-show prettyprint"><code class="prism language-php has-numbering" onclick="mdcp.signin(event)" style="position: unset;"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$_SERVER</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"REQUEST_METHOD"</span><span class="token punctuation">]</span> <span class="token operator">==</span> <span class="token string double-quoted-string">"GET"</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
<span class="token variable">$username</span> <span class="token operator">=</span> <span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"username"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token variable">$password</span> <span class="token operator">=</span> <span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"password"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">// 进行数据验证和处理</span>
<span class="token punctuation">}</span>
<span class="token operator">?</span><span class="token operator">></span>
<div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li></ul></pre>
<p>请注意，从安全性角度考虑，对用户提交的数据进行验证和过滤是非常重要的。应该对输入数据进行适当的验证和处理，以防止安全漏洞和恶意输入。</p>
<p>以上是HTML表单元素的基本创建和处理过程。实际中，表单可以包含更多的输入字段和复杂的验证逻辑，具体取决于项目需求。</p>
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