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一文搞懂【Web 前端】HTML 与 CSS 基础知识

大唐御医下载 • 2022-6-10 • html-js-css • 阅读 16

一文搞懂【Web 前端】HTML 与 CSS 基础知识,第1张

摘要

一个 Web 页面是如何在浏览器上展示的？我们在浏览器上查看网页源代码，可看到众多的标签、符号和文字，这就是一个 HTML 文件，而浏览器可以将这个文件解析成一个 Web 页面。一个 Web 页面如何设计样式、呈现出精美的视觉效果？则需要通过 CSS 对 HTML 进行加工美化。

文章目录 摘要HTML简介基本架构HTML 标签基本标签文本格式化特殊标签 CSS简介CSS 语法基本形式文本属性结构属性

HTML 简介

HTML(HyperText Markup Language) 超文本标记语言，何谓超文本？简单来说，超文本指具有超链接功能的文本，即一个超文本可以由若干个超链接构成，最常见的应用场景便是 Web 页面，也用于其他领域，譬如 Markdown 文档。

基本架构

标签：表明是一个 HTML 文档。
</code> 标签：定义文档的标题。<br /> <code><body></code> 标签：定义文档的内容主体。<br /> <code><p></code> 标签：定义一个段落。<br /> <code><br /></code> 标签：换行标签。</p> <p>注：莫要忘记加上结束标签！</p> <pre><code ><span ><span ><span ><</span><strong class="superseo"><a href="/tag/140.html" class="superseo">html</a></strong></span><span >></span></span> <span ><span ><span ><</span>title</span><span >></span></span>demo<span ><span ><span ></</span>title</span><span >></span></span> <span ><span ><span ><</span>body</span><span >></span></span> <span ><span ><span ><</span>p</span><span >></span></span> Hello World!<span ><span ><span ><</span>br</span> <span >/></span></span>Hello Web! <span ><span ><span ></</span>p</span><span >></span></span> <span ><span ><span ></</span>body</span><span >></span></span> <span ><span ><span ></</span>html</span><span >></span></span> </code></pre> <p>这段代码在浏览器中的效果：</p> <title> demo

Hello World!
Hello Web!

HTML 标签 基本标签

html 标签：表示是一个 HTML 文档。
</code> 标签：定义文档的标题。<br /> <code><body></code> 标签：定义文档的内容主体。<br /> <code><p></code> 标签：定义一个段落。<br /> <code><br /></code> 标签：表示换行。<br /> <code><h></code> 标签：定义文本中的标题。<br /> <code><hr></code> 标签：表示一条水平分割线。<br /> <code><!-- --></code> 标签：定义注释。</p> 文本格式化 <pre><code ><span ><span ><span ><</span>b</span><span >></span></span>粗体<span ><span ><span ></</span>b</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>i</span><span >></span></span>斜体<span ><span ><span ></</span>i</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>em</span><span >></span></span>强调文字<span ><span ><span ></</span>em</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>small</span><span >></span></span>小号文字<span ><span ><span ></</span>small</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>strong</span><span >></span></span>加重视觉效果<span ><span ><span ></</span>strong</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>sub</span><span >></span></span>上标<span ><span ><span ></</span>sub</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>sup</span><span >></span></span>下标<span ><span ><span ></</span>sup</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>ins</span><span >></span></span>插入字<span ><span ><span ></</span>ins</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>del</span><span >></span></span>删除字<span ><span ><span ></</span>del</span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> </code></pre> <p>这段代码解析后为：</p> <p>粗体<br /><br /> <i>斜体</i><br /><br /> <em>强调文字</em><br /><br /> <small>小号文字</small><br /><br /> 加重视觉效果<br /><br /> <sub>上标</sub><br /><br /> <sup>下标</sup><br /><br /> <ins>插入字</ins><br /><br /> <del>删除字</del><br /></p> 特殊标签 <p>链接</p> <pre><code ><span ><span ><span ><</span>a</span> <span >href</span><span ><span >=</span><span >"</span>http://cohanbb.github.io/<span >"</span></span><span >></span></span>这是一条链接<span ><span ><span ></</span>a</span><span >></span></span> </code></pre> <p>这是一条链接</p> <p>图像</p> <pre><code ><span ><span ><span ><</span>img</span> <span >src</span><span ><span >=</span><span >"</span>http://www.kaotop.com/file/tupian/20220523/b87c8e05-344a-48d1-869f-ef6929fc8b17.jpg?imageView2/2/w/1024/<span >"</span></span> <span >alt</span><span ><span >=</span><span >"</span>图片加载失败<span >"</span></span> <span >width</span><span ><span >=</span><span >"</span>300<span >"</span></span> <span >height</span><span ><span >=</span><span >"</span>300<span >"</span></span><span >/></span></span> </code></pre> <p>预格式文本</p> <pre><code ><span ><span ><span ><</span>pre</span><span >></span></span> 预格式文本 文本会保留换行和空格 文本换为等线体，常用于表示代码块 <span ><span ><span ></</span>pre</span><span >></span></span> </code></pre> <pre> 预格式文本 文本会保留换行和空格 文本换为等线体，常用于表示代码块 </pre> <p>代码和代码块</p> <pre><code ><span ><span ><span ><</span>code</span><span >></span></span>printf('代码')<span ><span ><span ></</span>code</span><span >></span></span> <span ><span ><span ><</span>pre</span><span >></span></span> <span ><span ><span ><</span>code</span><span >></span></span>printf('代码块');<span ><span ><span ></</span>code</span><span >></span></span> <span ><span ><span ><</span>code</span><span >></span></span>return;<span ><span ><span ></</span>code</span><span >></span></span> <span ><span ><span ></</span>pre</span><span >></span></span> </code></pre> <p><code>printf(‘代码’)</code></p> <pre><code>printf('代码块'); return; </code></pre> <p>表格</p> <pre><code ><span ><span ><span ><</span>table</span> <span >border</span><span ><span >=</span><span >"</span>1<span >"</span></span><span >></span></span> <span ><span ><span ><</span>tr</span><span >></span></span> <span ><span ><span ><</span>th</span><span >></span></span>标题1<span ><span ><span ></</span>th</span><span >></span></span> <span ><span ><span ><</span>th</span><span >></span></span>标题2<span ><span ><span ></</span>th</span><span >></span></span> <span ><span ><span ></</span>tr</span><span >></span></span> <span ><span ><span ><</span>tr</span><span >></span></span> <span ><span ><span ><</span>td</span><span >></span></span>row 1, cell 1<span ><span ><span ></</span>td</span><span >></span></span> <span ><span ><span ><</span>td</span><span >></span></span>row 1, cell 2<span ><span ><span ></</span>td</span><span >></span></span> <span ><span ><span ></</span>tr</span><span >></span></span> <span ><span ><span ><</span>tr</span><span >></span></span> <span ><span ><span ><</span>td</span><span >></span></span>row 2, cell 1<span ><span ><span ></</span>td</span><span >></span></span> <span ><span ><span ><</span>td</span><span >></span></span>row 2, cell 2<span ><span ><span ></</span>td</span><span >></span></span> <span ><span ><span ></</span>tr</span><span >></span></span> <span ><span ><span ></</span>table</span><span >></span></span> </code></pre> <table border="1"><tbody><tr><th>标题1</th><th>标题2</th></tr><tr><td>row 1, cell 1</td><td>row 1, cell 2</td></tr><tr><td>row 2, cell 1</td><td>row 2, cell 2</td></tr></tbody></table> <p>列表</p> <pre><code >有序列表 <span ><span ><span ><</span>ol</span><span >></span></span> <span ><span ><span ><</span>li</span><span >></span></span>YES<span ><span ><span ></</span>li</span><span >></span></span> <span ><span ><span ><</span>li</span><span >></span></span>NO<span ><span ><span ></</span>li</span><span >></span></span> <span ><span ><span ></</span>ol</span><span >></span></span> 无序列表 <span ><span ><span ><</span>ul</span><span >></span></span> <span ><span ><span ><</span>li</span><span >></span></span>yes<span ><span ><span ></</span>li</span><span >></span></span> <span ><span ><span ><</span>li</span><span >></span></span>no<span ><span ><span ></</span>li</span><span >></span></span> <span ><span ><span ></</span>ul</span><span >></span></span> 自定义列表 <span ><span ><span ><</span>dl</span><span >></span></span> <span ><span ><span ><</span>dt</span><span >></span></span>YES<span ><span ><span ></</span>dt</span><span >></span></span> <span ><span ><span ><</span>dd</span><span >></span></span>yes<span ><span ><span ></</span>dd</span><span >></span></span> <span ><span ><span ><</span>dt</span><span >></span></span>NO<span ><span ><span ></</span>dt</span><span >></span></span> <span ><span ><span ><</span>dd</span><span >></span></span>no<span ><span ><span ></</span>dd</span><span >></span></span> <span ><span ><span ></</span>dl</span><span >></span></span> </code></pre> <p>有序列表</p> YESNO <p>无序列表</p> yesno <p>自定义列表</p> YES yes NO no <p>引用</p> <pre><code ><span ><span ><span ><</span>blockquote</span><span >></span></span> 一级引用 <span ><span ><span ><</span>blockquote</span><span >></span></span> 二级引用 <span ><span ><span ></</span>blockquote</span><span >></span></span> <span ><span ><span ></</span>blockquote</span><span >></span></span> </code></pre> <blockquote> 一级引用 <blockquote> 二级引用 </blockquote> </blockquote> <p>块级元素和内联元素</p> <pre><code >1.这是一个<span ><span ><span ><</span>div</span><span >></span></span> 块级元素<span ><span ><span ><</span>br</span> <span >/></span></span>从新的一行出现以及结束 <span ><span ><span ></</span>div</span><span >></span></span> 2.这是一个<span ><span ><span ><</span>span</span><span >></span></span> 内联元素，不会以新行开始 <span ><span ><span ></</span>span</span><span >></span></span> </code></pre> <p>1.这是一个</p> <br /> 块级元素 <br />从新的一行出现以及结束 <p></p> <p>2.这是一个<br /> 内联元素，不会以新行开始<br /> </p> <p>表单</p> <pre><code ><span ><span ><span ><</span>form</span> <span >action</span><span ><span >=</span><span >"</span>URL<span >"</span></span> <span >method</span><span ><span >=</span><span >"</span>get or post<span >"</span></span><span >></span></span> username: <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>text<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>username<span >"</span></span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> password: <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>password<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>password<span >"</span></span><span >></span></span><span ><span ><span ><</span>br</span> <span >/></span></span> 单选框<span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>radio<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>sex<span >"</span></span> <span >value</span><span ><span >=</span><span >"</span>male<span >"</span></span><span >></span></span>男<span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>radio<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>sex<span >"</span></span> <span >value</span><span ><span >=</span><span >"</span>female<span >"</span></span><span >></span></span>女<span ><span ><span ><</span>br</span> <span >/></span></span> 复选框<span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>checkbox<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>number<span >"</span></span> <span >value</span><span ><span >=</span><span >"</span>1<span >"</span></span><span >></span></span>1<span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>checkbox<span >"</span></span> <span >name</span><span ><span >=</span><span >"</span>number<span >"</span></span> <span >value</span><span ><span >=</span><span >"</span>2<span >"</span></span><span >></span></span>2<span ><span ><span ><</span>br</span> <span >/></span></span> 提交表单<span ><span ><span ><</span>br</span> <span >/></span></span> <span ><span ><span ><</span>input</span> <span >type</span><span ><span >=</span><span >"</span>submit<span >"</span></span> <span >value</span><span ><span >=</span><span >"</span>submit<span >"</span></span><span >/></span></span> <span ><span ><span ></</span>form</span><span >></span></span> </code></pre> <p>脚本</p> <pre><code ><span ><span ><span ><</span>script</span><span >></span></span><span > script code<span >,</span> such <span >as</span> JavaScript<span >.</span> </span><span ><span ><span ></</span>script</span><span >></span></span> </code></pre> <p>样式</p> <pre><code ><span ><span ><span ><</span>style</span> <span >type</span><span ><span >=</span><span >"</span>text/<strong class="superseo"><a href="/tag/141.html" class="superseo">css</a></strong><span >"</span></span><span >></span></span><span > css code </span><span ><span ><span ></</span>style</span><span >></span></span> </code></pre> CSS 简介 <p>CSS(Cascading Style Sheets) 层叠样式表，用以定义 HTML 中元素的样式，HTML 使用 CSS 的方式有三种：</p> <p>内联样式：在 HTML 元素标签中使用 “style” 属性。</p> <pre><code ><span ><span ><span ><</span>p</span><span ><span > <span >style</span></span><span >="</span><span ><span >color</span><span >:</span>blue<span >;</span><span >font-family</span><span >:</span>consolas<span >;</span></span><span >"</span></span><span >></span></span> inline <span ><span ><span ></</span>p</span><span >></span></span> </code></pre> <p>内部样式表：在 HTML 文档 <code><header></code> 区域使用 <code><style></code> 包含 CSS。</p> <pre><code ><span ><span ><span ><</span>head</span><span >></span></span> <span ><span ><span ><</span>style</span> <span >type</span><span ><span >=</span><span >"</span>text/css<span >"</span></span><span >></span></span><span > CSS code </span><span ><span ><span ></</span>style</span><span >></span></span> <span ><span ><span ></</span>head</span><span >></span></span> </code></pre> <p>外部引用：使用外部 CSS 文件定义样式。</p> <pre><code ><span ><span ><span ><</span>head</span><span >></span></span> <span ><span ><span ><</span>link</span> <span >rel</span><span ><span >=</span><span >"</span>stylesheet<span >"</span></span> <span >type</span><span ><span >=</span><span >"</span>text/css<span >"</span></span> <span >href</span><span ><span >=</span><span >"</span>xxx.css<span >"</span></span><span >></span></span> <span ><span ><span ></</span>head</span><span >></span></span> </code></pre> CSS 语法 基本形式 <pre><code ><span >[选择器]</span> <span >{<!-- --></span> [属性]<span >:</span> [描述]<span >;</span> ...... <span >}</span> </code></pre> <p>选择器可以是 HTML 标签，也可以是 id 或 class。</p> id 选择器只能定义标有特定 id 的元素的样式，形式为 <code>#[id]</code>。class 选择器可以定义一类元素的样式，形式为 <code>.[class]</code>。 文本属性 <p>background</p> <p>background-color:</p> <blockquote> <p>三种定义方式：RGB “rgb(x,x,x)”，十六进制 “#H H H”， name “black”。</p> </blockquote> <p>background-image:</p> <blockquote> <p>url(‘pic-url’)</p> </blockquote> <p>background-repeat：背景图像在哪个方向重复。</p> <blockquote> <p>repeat, repeats-x, repeat-y, no-repeat</p> </blockquote> <p>background-attachment：背景图像是否跟随页面滚动。</p> <p>background-position：背景图像的位置。</p> <p>text</p> <p>color：文本颜色。</p> <p>direction：文本方向。</p> <p>letter-spacing：字符间隔。</p> <p>word-spacing：单词间隔。</p> <p>line-height：行高。</p> <p>text-align：对齐方式。</p> <blockquote> <p>left, right, center, justify, inherit</p> </blockquote> <p>text-indent：首行缩紧。</p> <p>text-shadow：文本阴影。</p> <p>text-decoration：文本画线修饰。</p> <p>white-space：空白元素的处理方式。</p> <blockquote> <p>默认 normal，即空白元素会被浏览器忽略。<br /> nowrap 文本不会换行，一直到 <code><br></code> 标签。<br /> pre 保留空白，pre-wrap 保留空白，但是正常换行。<br /> pre-line 合并空白元素，但是保留一个空格，正常换行。</p> </blockquote> <p>word-wrap：单词的换行方式，一般用 break-word。</p> <p>word-break：是否允许单词内断开，若用 break-all，则会在单词内部断开。</p> <p>font</p> <p>font-family：</p> <table><thead><tr><th>说明</th><th>Generic-family</th><th>特定系列</th><th>具体字体</th></tr></thead><tbody><tr><td>有衬线体</td><td>Serif</td><td>Times, Georgia</td><td>“Times New Roman”, “Geogria”, “宋体”, “仿宋”</td></tr><tr><td>无衬线体</td><td>Sans-serif</td><td>Sans-serif</td><td>“Arial”, “Helvetica”, Verdana", “黑体” 等</td></tr><tr><td>等宽体</td><td>Monospace</td><td>Consolas</td><td>“Courier”, “Courier New”, "Lucinda Console"等</td></tr></tbody></table> <p>font-size：</p> <blockquote> <p>CSS 中表示字体大小有多种形式：</p> px 像素值。pt 磅(= 0.75px)。em 相对父元素的大小。rem 相对于 html 标签中 font-size 的大小，默认 1rem = 16px。percentage 同 em。使用绝对大小和相对大小值。 </blockquote> <p>font-style：斜体样式。</p> <p>font-weight：字体粗细。</p> <p>链接</p> a:link：未访问过的链接。a:visited：已访问过的链接。a:hover：鼠标放置的链接。a:active：鼠标点击的链接。 <pre><code ><span >a:link or visited or hover or active</span> <span >{<!-- --></span> <span >background-color</span><span >:</span><span >;</span> <span >/*链接背景颜色*/</span> <span >color</span><span >:</span><span >;</span> <span >/*链接字体颜色*/</span> <span >text-decoration</span><span >:</span><span >;</span> <span >/*链接文本画线修饰*/</span> <span >}</span> </code></pre> 结构属性 <p>盒子模型<br /> 所有的 HTML 元素都可以看成一个盒子模型，包括外边距(margin)、边框(border)、内边距(padding)、内容(content)，内容指的是文本或图像等。</p> <p></p> <p>margin</p> <table><thead><tr><th>属性</th><th>说明</th><th>描述</th></tr></thead><tbody><tr><td>margin-top</td><td>上边距</td><td>auto, length, percentage</td></tr><tr><td>margin-right</td><td>右边距</td><td>auto, length, percentage</td></tr><tr><td>margin-bottom</td><td>下边距</td><td>auto, length, percentage</td></tr><tr><td>margin-left</td><td>左边距</td><td>auto, length, percentage</td></tr><tr><td>margin</td><td>以上四个可简写为 margin</td><td>按个数 4，3，2，1 依次表示：<br /> 上，右，下，左；上，左右，下；上下，左右；全部外边距。</td></tr></tbody></table> <p>border</p> <p>border-width：边框的宽度。</p> <blockquote> 可以用 thin, medium, thick, length, inherit 表示。按个数 4，3，2，1 依次表示：上，右，下，左；上，左右，下；上下，左右；全部边框的宽度。 </blockquote> <p>border-color：边框的颜色。</p> <blockquote> RGB 十六进制 name 三种表示法。按个数 4，3，2，1 依次表示：上，右，下，左；上，左右，下；上下，左右；全部边框的颜色。 </blockquote> <p>border-style：边框的风格。</p> <blockquote> 无边框 none，点线边框 dotted，虚线边框 dashed，实线边框 solid，两个实线边框 double，3D沟槽边框 groove，3D脊边框 ridge，3D嵌入边框 inset，3D突出边框 outset。按个数 4，3，2，1 依次表示： 上，右，下，左；上，左右，下；上下，左右；全部边框的风格。 </blockquote> <p>border-[none/top/right/bottom/left]：以上三个简写。</p> <blockquote> <p>参数依次为：[width],[style],[color]</p> </blockquote> <p>border-radius：设置圆角边框。</p> <blockquote> <p>length 或 percentage。</p> </blockquote> <p>border-[top/right/bottom/left]-[width/style/color]：设置某一边的某一个属性。</p> <p>padding<br /> 使用方法与 margin 类似。</p> <p>display<br /> 典型的块元素：<code><p></code> <code></code> <code><pre></code> <code><h></code>，典型的内联元素：<code></code> <code><span></code> <code><code></code>，display 可以更改元素的显示方式。</p> inline： 内联元素。block：块元素。 <p>overflow</p> 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