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HTML标签是什么?常见标签有哪些?

2025-08-02 14:00:50 0浏览 收藏

你在学习文章相关的知识吗?本文《HTML标签是什么?常用标签有哪些?》,主要介绍的内容就涉及到,如果你想提升自己的开发能力,就不要错过这篇文章,大家要知道编程理论基础和实战操作都是不可或缺的哦!

HTML标签是构建网页的基础,用于定义内容结构和显示方式。1. HTML标签是用尖括号包围的预定义关键词,通常成对出现,如和,也有自闭合标签如
。2. 常见标签包括(根元素)、(元数据容器)、(页面标题)、<body>(可见内容)、<h1>-<h6>(标题)、<p>(段落)、<a>(超链接)、<img>(图像)、<ul>(无序列表)、<ol>(有序列表)、<li>(列表项)、<div>(块级分区)、<span>(内联样式化)、<table>(表格)、<tr>(表格行)、<td>(单元格)、<form>(表单)、<input>(输入字段)、<button>(按钮)、<script>(脚本)和<style>(样式定义)。3. 标签可包含属性,以名称/值对形式出现,如name="value",并置于开始标签中,常用属性有class(类名)、id(唯一标识)、style(内联样式)、title(悬停提示)、href(链接地址)、src(资源路径)和alt(替代文本)。4. 正确嵌套规则为“先开后关,后开先关”,例如<p>This is a <strong>paragraph</strong> with <em>emphasis</em>.</p>是正确的,而<p>This is a <strong>paragraph with <em>emphasis</strong>.</p>是错误的,因标签交叉关闭。5. 某些标签有内容限制,如<head>仅包含元数据标签,<div>为块级元素占据整行,<span>为内联元素仅占内容空间。理解标签用途、属性用法及嵌套规则是编写有效HTML的关键,通过持续练习和查阅文档可不断提升熟练度。</p><p><img src="/uploads/20250802/1754114410688da96a1db4b.jpg" alt="什么是HTML标签?常见的HTML标签有哪些?"></p><p>HTML标签是构建网页的基石,它们告诉浏览器如何显示内容。简单来说,标签就像是包裹着文字、图片或其他元素的“盒子”,浏览器会根据这些“盒子”的指示来呈现网页。</p><p>HTML标签是预定义的关键词,用尖括号括起来,例如 <code><html></code>、<code><head></code>、<code><body></code>、<code><p></code> 等。它们通常成对出现,一个开始标签和一个结束标签,结束标签在开始标签的前面加上一个斜杠,例如 <code><p></code> 和 <code></p></code>。有些标签是自闭合的,例如 <code><br></code> 和 <code><img></code>。</p><p>常见的HTML标签及其用途:</p><ul><li><strong><code><html></code></strong>: 根元素,包含整个HTML页面。</li><li><strong><code><head></code></strong>: 包含文档的元数据,例如标题、字符集、样式表等。</li><li><strong><code><title></code></strong>: 定义浏览器工具栏中的标题。</li><li><strong><code><body></code></strong>: 包含可见的页面内容。</li><li><strong><code><h1></code> - <code><h6></code></strong>: 定义标题,<code><h1></code> 是最重要的标题,<code><h6></code> 是最不重要的标题。</li><li><strong><code><p></code></strong>: 定义段落。</li><li><strong><code><a></code></strong>: 定义超链接,用于链接到其他页面或资源。</li><li><strong><code><img></code></strong>: 定义图像。</li><li><strong><code><ul></code></strong>: 定义无序列表。</li><li><strong><code><ol></code></strong>: 定义有序列表。</li><li><strong><code><li></code></strong>: 定义列表项。</li><li><strong><code><div></code></strong>: 定义文档中的一个区域或节。</li><li><strong><code><span></code></strong>: 定义内联元素,用于对文本进行样式化。</li><li><strong><code><table></code></strong>: 定义表格。</li><li><strong><code><tr></code></strong>: 定义表格中的行。</li><li><strong><code><td></code></strong>: 定义表格中的单元格。</li><li><strong><code><form></code></strong>: 定义HTML表单,用于收集用户输入。</li><li><strong><code><input></code></strong>: 定义输入字段,用于收集用户输入。</li><li><strong><code><button></code></strong>: 定义按钮。</li><li><strong><code><script></code></strong>: 定义客户端脚本,例如JavaScript。</li><li><strong><code><style></code></strong>: 定义文档的样式信息。</li></ul><h3>HTML标签的属性是什么?如何使用?</h3><p>HTML标签可以拥有属性,属性提供关于元素的附加信息。属性总是以名称/值对的形式出现,例如 <code>name="value"</code>。属性总是添加到开始标签中。</p><p>举个例子,<code><img></code> 标签的 <code>src</code> 属性指定图像的URL:</p><pre><img src="image.jpg" alt="My Image"></pre><p>这里,<code>src</code> 是属性名,<code>image.jpg</code> 是属性值。<code>alt</code> 属性提供图像的替代文本,当图像无法显示时,会显示这段文本。</p><p>常见的属性包括:</p><ul><li><code>class</code>: 指定元素的类名,用于CSS样式化。</li><li><code>id</code>: 指定元素的唯一ID,用于CSS样式化和JavaScript操作。</li><li><code>style</code>: 直接在元素上应用CSS样式。不推荐过度使用,因为这会使代码难以维护。</li><li><code>title</code>: 指定元素的标题,当鼠标悬停在元素上时,会显示标题。</li><li><code>href</code>: 用于<code><a></code>标签,指定链接的目标URL。</li><li><code>src</code>: 用于<code><img></code>标签,指定图像的URL。</li><li><code>alt</code>: 用于<code><img></code>标签,指定图像的替代文本。</li></ul><p>使用属性很简单,只需在开始标签中添加属性名和属性值即可。多个属性之间用空格分隔。</p><h3>如何正确嵌套HTML标签?</h3><p>HTML标签的嵌套规则非常重要,错误的嵌套会导致页面显示异常甚至无法解析。 简单的说,就是“先开后关,后开先关”。</p><p>正确的嵌套:</p><pre><p>This is a <strong>paragraph</strong> with <em>emphasis</em>.</p></pre><p>错误的嵌套:</p><pre><p>This is a <strong>paragraph with <em>emphasis</strong>.</p></pre><p>在上面的错误示例中,<code><strong></code> 标签在 <code><em></code> 标签之前关闭,这是不允许的。浏览器可能会尝试纠正这种错误,但结果可能不是你想要的。</p><p>需要注意的是,某些标签只能包含特定的其他标签。例如,<code><head></code> 标签只能包含元数据标签,如 <code><title></code>、<code><meta></code>、<code><style></code> 等。<code><body></code> 标签包含可见的页面内容。</p><p>此外,<code><div></code> 和 <code><span></code> 标签通常用于组织和样式化内容,它们可以包含几乎任何其他HTML标签。<code><div></code> 是块级元素,会占据一整行,而 <code><span></code> 是内联元素,只占据它需要的内容空间。</p><p>总而言之,理解HTML标签的用途、属性和嵌套规则是编写有效HTML代码的关键。多练习,多查阅文档,你会越来越熟练。</p><p>到这里,我们也就讲完了《HTML标签是什么?常见标签有哪些?》的内容了。个人认为,基础知识的学习和巩固,是为了更好的将其运用到项目中,欢迎关注golang学习网公众号,带你了解更多关于属性,网页构建,HTML标签,嵌套,常用标签的知识点!</p> </div> <div class="labsList"> <a href="javascript:;" title="属性">属性</a> <a href="javascript:;" title="网页构建">网页构建</a> <a href="javascript:;" title="HTML标签">HTML标签</a> <a href="javascript:;" title="嵌套">嵌套</a> <a href="javascript:;" title="常用标签">常用标签</a> </div> <div class="cateBox"> <div class="cateItem"> <a href="/article/272811.html" title="ASP.NETAJAXPOST转GET方法解析" class="img_box"> <img src="/uploads/20250802/1754114430688da97eb1b9a.jpg" onerror="this.onerror='',this.src='/assets/images/moren/morentu.png'" alt="ASP.NETAJAXPOST转GET方法解析">ASP.NETAJAXPOST转GET方法解析 </a> <dl> <dt class="lineOverflow"><a href="/article/272811.html" title="ASP.NETAJAXPOST转GET方法解析" class="aBlack">上一篇<i></i></a></dt> <dd class="lineTwoOverflow">ASP.NETAJAXPOST转GET方法解析</dd> </dl> </div> <div 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style="height:70px; width:205px; float: left;"> <input type="text" name="captcha" class="form-control" placeholder="验证码" /> </div> <span class="input-group-btn" style="padding:0;border:none;"> <a href="javascript:;" class="btn btn-primary btn-captcha cursorPointer" style="background: #2080F8; border-radius: 4px; color: #fff; padding: 12px; position: absolute;" data-url="/api/ems/send.html" data-type="email" data-event="resetpwd">发送验证码</a> </span> </div> <input type="password" class="form-control" id="newpassword" name="newpassword" value="" placeholder="请输入6-18位密码"> <div class="loginBtn mt25"> <button type="submit">重置密码</button> </div> </form> </div> </div> </div> </div> </div> </div> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> <script src="/assets/js/require.js" data-main="/assets/js/require-frontend.js?v=1671101972"></script> </body> </html>