HTML自学笔记

摘要

本片是在老师理论知识的指导下进行自己尝试总结(理论有部分搬运了老师的教程),自己并做了一些尝试,最后结果还是很丑陋。但是我会不断完善的。之后又自学了一些相关课程

文章目录

    • 摘要
    • 一、HTML简介
    • 二、HTML文档结构
      • :fire: HTML元素
      • :fire: 文本格式
      • :fire: 超链接
      • :fire: 图片及文件路径
      • :fire: 表格
      • :fire: 列表
      • :fire:表单 Form
      • :fire: 其它
    • 三、结果
    • 四、补充视频学习
      • :star: meta标签
      • :star: 图片
      • :star:内联框架
      • :star: 音频视频文件播放
      • :star:块元素与行内元素
      • :star: 标签

一、HTML简介

HTML是超文本标记语言(HyperText Markup Language)的缩写。我们用 HTML 来构建 Web 页面即所谓的网页。

在我看来相当于Web的框架。需要与之后学习的CSS(起到修饰作用),JS(内部行为)共同构建我们所说的网页。

我们可以将这些内容跟上传到互联网,然后让它和别人创建的相链接。

右键单击网页,可以查看网络源码,可以看到HTML文档

二、HTML文档结构

基本结构:


<html>

<head> 
head>

<body>

body>

总结其基本构架:

  • html:元素。这个元素包裹了整个完整的页面,是一个根元素,它元素都嵌套到其中。
  • head:表示标签头,可以加入图标; 这个元素是一个容器,它包含了所有你想包含在HTML页面中但不想在HTML页面中显示的内容。这些内容包括你想在搜索结果中出现的关键字和页面描述,CSS样式,字符集声明等等。
  • body:含你能在页面看到的所有内容,包括文本,图片,音频,游戏等等

相关的一些练习:


<html>
  <head>
    <meta charset="utf-8" />
    <link rel="shortcut icon" href="./images/ICO.svg" type="image/x-icon" />
    <title>LEEtitle>
  head>
  <body>
    <h2><mark>这是我的第一次练习mark>h2>
    <h4>现在开始了:)h4>
  body>
html>

相关解释

  • meta:这个元素设置文档使用utf-8字符集编码,utf-8字符集包含了人类大部分的文字。基本上他能识别你放上去的所有文本内容。毫无疑问要使用它,并且它能在以后避免很多其他问题。
  • link:指定页面的图标,出现在浏览器标签上。(试一试:你可随意下载一个.ico图标文件到工作目录中)
  • h1为一级标题,从一级到六级,包括了h1,h2…h6
  • p表示段落
  • mark为高亮

HTML元素

HTML 使用"标记"(markup)来注明文本、图片和其他内容,以便于在浏览器中显示。HTML 标记包含一些规定的"元素"如 ,<body>,<header>,<footer>,<article>,<section>,<p>,<div>,<span>,<img>,<aside>,<audio>,<canvas>,<d</code>atalist>,,,</p> <nav> ,,, 等等。 </nav> <p></p> <p>检查我们刚创建的 HTML 文档你会发现,整个 HTML 就由一个个元素组成(可以嵌套),而元素则一般由一对标签(tag)构成。</p> <blockquote> <p>注释:<mark>ctrl+/</mark></p> </blockquote> <p><strong>空元素</strong></p> <p>元素都拥有<strong>开始标签,内容,结束标签</strong>。但有一些元素只有一个开始标签,通常用来在此元素所在位置插入/嵌入一些东西,如<code><br>, <hr>, <input>, <img>, <a></code>等等。我们称其为空元素,如下:</p> <blockquote> <p>br:换行</p> <p>input:输入框</p> </blockquote> <p><strong>元素的属性</strong></p> <p>元素是可以有相关属性的。属性包含元素的额外信息,这些信息不会在浏览器中显示出来。</p> <pre><code class="prism language-html"> <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>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>mark</span><span class="token punctuation">></span></span>元素属性<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>mark</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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>p</span> <span class="token attr-name">title</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>这是title的属性<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>鼠标放置显示<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>input</span> <span class="token attr-name">title</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>请输入用户名<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<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">title</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>密码<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span> </code></pre> <blockquote> <p>一个属性必须包含如下内容:</p> <ol> <li>一个空格,在属性和元素名称之间。(如果已经有一个或多个属性,就与前一个属性之间有一个空格。)</li> <li>属性名称,后面跟着一个 = 号。</li> <li>一个属性值,由一对引号 “” 引起来。</li> </ol> </blockquote> <h4> 文本格式</h4> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>您可以使用mark标记来<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>mark</span><span class="token punctuation">></span></span> highlight </ mark>文本。</ p> <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>del</span><span class="token punctuation">></span></span>此行文本应视为已删除的文本。</ del> </ p> <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>s</span><span class="token punctuation">></span></span>此行文本已被视为不再准确。</ s> </ p> <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>ins</span><span class="token punctuation">></span></span>此行文本应被视为文档的补充。</ ins> </ p> <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>u</span><span class="token punctuation">></span></span>此行文本将显示为带下划线的</ u> </ p> <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>small</span><span class="token punctuation">></span></span>此行文本应视为精美文字。</ small> </ p> <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>此行以粗体显示。</ strong> </ p> <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>此行呈现为斜体文本。</ em> </ p> </code></pre> <blockquote> <p><code><mark>highlight</mark></code>高亮</p> <p><code><del>This line of text is meant to be treated as deleted text.</del></code>划掉</p> </blockquote> <h4> 超链接</h4> <p>没有超链接就没有万维网(World Wide Web)。基本上,我们可以把任何东西加上超链接,不过常用的是文本、图片等。</p> <p>这里我设计了一个重庆交通大学的超链接</p> <pre><code class="prism language-html"><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">=</span><span class="token punctuation">"</span>http://www.cqjtu.edu.cn/<span class="token punctuation">"</span></span> <span class="token attr-name">target</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>_blank<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>em</span><span class="token punctuation">></span></span>重庆交通大学<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>em</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 punctuation">></span></span> </code></pre> <p>说明:</p> <ol> <li><code>href</code>即为要跳转去的地址 <mark>URL(Uniform Resorce Locator )</mark></li> <li><code>target</code>属性为<code>_blank</code>表示在<mark>新的页面</mark>打开超链接(默认是在当前页面打开即<code>_self</code>)</li> <li>超链接标签包含的内容(当前为文字"百度一下")即为显示在页面上供用户点击的</li> </ol> <p><strong>锚点</strong></p> <p>锚点,也称为书签,用于标记页面的某个元素或位置。通过锚点,我们可以轻易的在<mark>长页面内</mark>实现跳转。</p> <p>先使用<code>id</code>属性生成某元素的锚点,然后再使用超链接指向该锚点即可。</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h3</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>C1<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>这是一个锚点<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h3</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">=</span><span class="token punctuation">"</span>#C1<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>br</span> <span class="token punctuation">/></span></span>返回头部<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span> </code></pre> <blockquote> <p><strong>注意:</strong></p> <ol> <li>元素的<code>id</code>值必须是唯一的,也即页面不能再有其它元素的<code>id</code>值为<code>C4</code></li> <li>超链接中的地址需要有<code>#</code>符号</li> </ol> </blockquote> <h4> 图片及文件路径</h4> <pre><code class="prism language-html"> <span class="token comment"><!-- 图片及文件路径,这个是绝对路径img --></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">=</span><span class="token punctuation">"</span>https://riyugo.com/i/2021/03/02/nt32k2.png<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>MDB Logo<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> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>mark</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span>CLIMB!!<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>mark</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> </code></pre> <pre><code class="prism language-html"> <span class="token comment"><!-- 相对路径 --></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">=</span><span class="token punctuation">"</span>./images/test1.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>MDB Logo<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span> </code></pre> <blockquote> <p>图片URL获取需要<mark>图床</mark>,可以采用空间和微博生成,当然也可以用一些免费图床</p> <p>以下都可以采用</p> <p>薄荷图床(国内免费的图床)</p> <p>国外免费图床</p> <p>IO图床</p> </blockquote> <p>说明:</p> <ol> <li><code>src</code>属性为要显示图片文件的位置 URL,即图片文件的路径</li> <li><code>alt</code>属性当获取图片出现问题时显示的文字(占位符)</li> <li>可为图片指定高宽度,但不建议(可能导致图片变形)</li> </ol> <p><strong>提示:</strong> 对于小尺寸的图片,现在可采用 <strong>base64</strong> 编码进行,可提高页面加载速度,提升用户体验。可前往一试。(小图比较合适)</p> <pre><code class="prism language-html"><span class="token comment"><!-- 生成base64编码后的引用方式 --></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>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>mark</span><span class="token punctuation">></span></span>ICON<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>mark</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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> <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADI.../> </code></pre> <p><strong>文件路径</strong></p> <p>为获取图片文件,我们需要指定该文件位于何处,这称为文件路径。文件路径有相对路径和绝对路径两种。</p> <p>上面图片的例子即为绝对路径。下面是相对路径的例子:</p> <ul> <li><code><img src="picture.jpg"></code> 该图片文件与当前文档在同一目录中</li> <li><code><img</code>src="./images/picture.jpg"><code>该图片文件在当前目录下的</code>images`目录中</li> <li><code><img src="../picture.jpg"></code> 该图片文件在上一级目录中</li> </ul> <h4> 表格</h4> <pre><code class="prism language-html"> <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>Firstname<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>Lastname<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>Age<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>Jill<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>Smith<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>50<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>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>Eve<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>Jackson<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>94<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> </code></pre> <p>代码中,<code><tr></code>表示行, <code><td></code>表示行中的单元, <code><th></code>是表头的单元(将会加粗显示)</p> <p><strong>说明:</strong> 当前这个表格比较丑陋,有关表格的美化我们在 CSS 部分学习。</p> <h4> 列表</h4> <p>我们也可以使用列表来呈现内容,分为无序列表和有序列表。</p> <p><strong>无序列表</strong></p> <pre><code class="prism language-html"><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>Coffee<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>Tea<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>Milk<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> </code></pre> <p>无序列表使用<code><ul></code>标签,默认使用<strong>实心圆点</strong>作为每项的标志,其它的标志可以是空心圆<code>circle</code>,实心方块<code>square</code>以及不出现标志。</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>square<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>li</span><span class="token punctuation">></span></span>Coffee<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>Tea<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>Milk<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> </code></pre> <p><strong>有序列表</strong></p> <pre><code class="prism language-html"><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>Coffee<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>Tea<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>Milk<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> </code></pre> <p>有序列表使用<code><ol></code>标签,默认使用<strong>数字</strong>作为每项的标志,其它的标志可以是大写字母<code>A</code>,小写字母<code>a</code>,罗马字母<code>i</code>等。</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ol</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>a<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>li</span><span class="token punctuation">></span></span>Coffee<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>Tea<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>Milk<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> </code></pre> <h4>表单 Form</h4> <p>当网站需要获取我们的一些信息如:用户名、密码、选择买什么、买多少、提出意见等等时,我们就需要使用表单(form)来让用户填写或选择。</p> <p>请输入如下代码进行学习:</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 文本框,注意有 placeholder 提示符 --></span> 用户名:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>name<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>请输入用户名<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>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 密码框 --></span> 密码:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>ps<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>请输入密码<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>br</span><span class="token punctuation">></span></span> 年龄:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 数字输入框,注意 min 和 value 属性--></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">=</span><span class="token punctuation">"</span>number<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>age<span class="token punctuation">"</span></span> <span class="token attr-name">min</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>18<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>18<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>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 单选按钮, 注意 checked 属性 --></span> 性别:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</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">=</span><span class="token punctuation">"</span>male<span class="token punctuation">"</span></span> <span class="token attr-name">checked</span><span class="token punctuation">></span></span> 男<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</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">=</span><span class="token punctuation">"</span>female<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 女<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</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">=</span><span class="token punctuation">"</span>other<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 其它<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 下拉列表,注意 selected 属性 --></span> 党派:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <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">=</span><span class="token punctuation">"</span>party<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">=</span><span class="token punctuation">"</span>D<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>民主党<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">=</span><span class="token punctuation">"</span>R<span class="token punctuation">"</span></span> <span class="token attr-name">selected</span><span class="token punctuation">></span></span>共和党<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">=</span><span class="token punctuation">"</span>N<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>无党派<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>select</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 多选框 --></span> 您有哪些交通工具:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>vehicle1<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>Bike<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 自行车<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>vehicle2<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>Motocycle<span class="token punctuation">"</span></span> <span class="token attr-name">checked</span><span class="token punctuation">></span></span> 摩托车<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>vehicle3<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>Car<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 轿车<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</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">=</span><span class="token punctuation">"</span>vehicle4<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>Jet<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> 飞机<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 日期选择器 --></span> 您的工作日期:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</span><span class="token punctuation">"</span>date<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>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 文件选择器 --></span> 上传您的照片:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</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">=</span><span class="token punctuation">"</span>file<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>photo<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>br</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 文本输入区域,注意 rows 和 cols 属性 --></span> 您的建议:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>textarea</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>message<span class="token punctuation">"</span></span> <span class="token attr-name">rows</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>5<span class="token punctuation">"</span></span> <span class="token attr-name">cols</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>30<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> The cat was playing in the garden. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>hr</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 表单提交/重置按钮,将表单中的数据取消或传输给服务器端进行处理 --></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">=</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">=</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>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>reset<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>重 置<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> </code></pre> <p><strong>提示:</strong> 当提交时,表单中没有<code>name</code>属性的元素将不会提交,比如上面工作日期的选择器。有<code>name</code>属性的元素其<code>value</code>的值将提交给服务器。</p> <blockquote> <p>这里我创建了一个超链接<code><a href="./FIRST_3_2_2.html" target="_blank">点击跳转至表单</a></code></p> </blockquote> <h4> 其它</h4> <p>HTML 的元素可以以称为<strong>区块</strong> 或 <strong>内联</strong>的方式进行显示。</p> <p><strong>区块元素</strong></p> <p>区块元素在浏览器显示时,通常会以<strong>新行</strong>来开始(和结束)。如:<code><h1>, <pre>, <ul>, <table>,<</code>div> 等。</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h2</span><span class="token punctuation">></span></span>区块元素<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>div</span><span class="token punctuation">></span></span>Hello<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>div</span><span class="token punctuation">></span></span>World<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>p</span><span class="token punctuation">></span></span>单独一行<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span> </code></pre> <p><strong>内联元素</strong></p> <p>内联元素相反,他们总是一个接一个进行显示,不会新起一行。如: <code><span>, <input>, <td>, <a>, <img></code>等。</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h3</span><span class="token punctuation">></span></span>下面的元素将在一行中显示<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h3</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 punctuation">></span></span>姓名:<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>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">name</span><span class="token attr-value"><span class="token punctuation">=</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>span</span><span class="token punctuation">></span></span>哈哈哈<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>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">=</span><span class="token punctuation">"</span>https://google.com/<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Google<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>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>https://mdbootstrap.com/img/logo/mdb192x192.jpg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> </code></pre> <p><strong>预设格式</strong></p> <p>如果你想在网页中展示一首诗或一些特别格式的文本,那么请使用<code>pre</code>标签。</p> <pre><code class="prism language-html"><span class="token comment"><!-- pre标签中的内容将保持格式不变 --></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>pre</span><span class="token punctuation">></span></span> .... <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>pre</span><span class="token punctuation">></span></span> </code></pre> <p><strong>特殊字符</strong></p> <p>考虑下面的代码将显示成什么?</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>有多 远,滚 多远!<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span> </code></pre> <p>或者你希望在页面显示一段 HTML 的源代码,你打算用标签<code><pre></code>:</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>pre</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>这是个一级标题<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>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>https://twitter.com/<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>眼见何事,情系何处,身处何方,心思何人<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>pre</span><span class="token punctuation">></span></span> </code></pre> <p>以上代码将得不到你想要的结果。<br> 原因是:在 HTML 中,某些字符是预留的。<br> 在 HTML 中不能使用小于号(<)和大于号(>),这是因为浏览器会误认为它们是标签。<br> 如果希望正确地显示预留字符,我们必须在 HTML 源代码中使用字符实体(character entities)</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>有多<span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span>远,滚<span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span><span class="token entity"> </span>多远!<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>hr</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>test.html<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>pre</span><span class="token punctuation">></span></span> <span class="token entity"><</span>h1<span class="token entity">></span>这是个一级标题<span class="token entity"><</span>/h1<span class="token entity">></span> <span class="token entity"><</span>p<span class="token entity">></span>这是一个段落<span class="token entity"><</span>p<span class="token entity">></span> <span class="token entity"><</span>a href="https://twitter.com/"<span class="token entity">></span>眼见何事,情系何处,身处何方,心思何人<span class="token entity"><</span>/a<span class="token entity">></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>pre</span><span class="token punctuation">></span></span> </code></pre> <h3>三、结果</h3> <p>这个结果还是很丑陋的,没有CSS的修饰确实没有很好的效果,暂且借用了老师的css文件,实现稍微好看一点儿的效果,这时第一次。</p> <p><a href="http://img.e-com-net.com/image/info8/bcf43c20db7741a781b3fcbe0752c34b.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/bcf43c20db7741a781b3fcbe0752c34b.jpg" alt="HTML自学笔记_第1张图片" width="650" height="349" style="border:1px solid black;"></a></p> <p><a href="http://img.e-com-net.com/image/info8/dd0119d020c44044b1efc05a18894170.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/dd0119d020c44044b1efc05a18894170.jpg" alt="HTML自学笔记_第2张图片" width="650" height="361" style="border:1px solid black;"></a></p> <p><a href="http://img.e-com-net.com/image/info8/a0e357d0873d4c86890f7c16ffe843bb.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/a0e357d0873d4c86890f7c16ffe843bb.jpg" alt="HTML自学笔记_第3张图片" width="650" height="354" style="border:1px solid black;"></a></p> <h3>四、补充视频学习</h3> <h4>⭐️ meta标签</h4> <p>写在head,设置网页的元数据,不是给用户看,爬虫用户看(搜索引擎可以看到)</p> <ul> <li>charset 网页的字符集</li> <li>name数据的名称</li> <li>content数据的内容</li> <li>keywords 表示网站的关键字,可以使用多个关键字(可以直接看网站学习)</li> <li>description:用于指定网站的描述,会显示再搜索引擎中的搜索结果中</li> <li>对网页重定向</li> </ul> <blockquote> <p>title标签的作用会作为搜索记过的超链接显示</p> </blockquote> <p><mark>MDN</mark>–文档</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>metal</span> <span class="token attr-name">http-eqiv</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>refresh<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>3;ur;=https://www.baidu.com<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> </code></pre> <p>请求重定向</p> <h4>⭐️ 图片</h4> <p>使用img</p> <p>img属于替换元素,介于块元素与行元素之间,具有两种元素的特点</p> <p>alt 属性是对图片的说明,这个描述,默认情况下不会显示,但是图片无法加载时会显示。搜索引擎根据alt来找到图片。</p> <p>width图片宽度,height表示高度</p> <p>移动端经尝需要对图片缩放(大变小)</p> <p><strong>图片格式</strong></p> <p>jpeg==jpg</p> <ul> <li>颜色多,不支持透明,不止动图</li> <li>显示照片</li> </ul> <p>gif</p> <ul> <li>颜色少,支持简单透明,支持动图</li> </ul> <p>png</p> <ul> <li>支持颜色丰富,支持复杂透明,不支持透明</li> <li>专为网页而生</li> </ul> <p>webp</p> <ul> <li>谷歌新推出的,专门用来表示网页中图片的</li> <li>缺点,兼容性不好</li> </ul> <p>一种格式。所有优点,文件也小</p> <p>效果一样用小的。效果不同用效果好的,logo大多都是gif</p> <p>base64,将图片进行编码</p> <h4>⭐️内联框架</h4> <p>iframe</p> <p>当前页面中引入了其它网页</p> <pre><code> <iframe src="https://www.baidu.com/" width="800" height="600"></iframe> </code></pre> <p>大部分用不到,把一个网页当作一个窗口引入到当前网页</p> <h4>⭐️ 音频视频文件播放</h4> <p><strong>音频</strong></p> <p>audio 标签用来向网页中引入一个外部的音频文件</p> <p>音视频文件引入时,默认情况下不允许用户控制播放停止。</p> <p>加入<strong>controls</strong>,就加入了控制组件</p> <pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>audio</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>./source/王北车 - 陷阱.flac<span class="token punctuation">"</span></span> <span class="token attr-name">controls</span> <span class="token attr-name">autoplay</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>audio</span><span class="token punctuation">></span></span> </code></pre> <p><strong>autoplay</strong> 打开音乐时自动播放,但是大部分浏览器不能自动播放</p> <p><strong>loop</strong>从头播放</p> <p>除了以上方式,还可以通过</p> <pre><code class="prism language-html"><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> 对不起,您的浏览器不支持播放音频! <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">=</span><span class="token punctuation">"</span>./source/王北车 - 陷阱.flac<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>audio</span><span class="token punctuation">></span></span> </code></pre> <p><strong>视频</strong></p> <pre><code><video src="./source/最短路径.mp4" controls loop></video> </code></pre> <p>video和音频的使用方式是一样的</p> <p>买服务器,一是服务器,二是带宽</p> <p>音频和视频一般不放本地,可以引别人的,就比如用aframe来引,分享得出连接即可。</p> <p><mark>26看完了</mark></p> <h4>⭐️块元素与行内元素</h4> <p>一般通过块元素对页面进行布局</p> <ul> <li>一般在块元素内放行内元素内</li> <li>但是不会在行内元素放块元素</li> <li>块元素基本上什么都能放</li> <li>p元素内不能任何块元素</li> </ul> <blockquote> <p>浏览器会自动把不符合规范的内容进行修正</p> </blockquote> <p>行内元素主要来包裹文字</p> <h4>⭐️ 标签</h4> <pre><code class="prism language-html"> <span class="token comment"><!-- 头部 --></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>head</span><span class="token punctuation">></span></span> <span class="token comment"><!-- 主体,只有一个main --></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>main</span><span class="token punctuation">></span></span> <span class="token comment"><!-- footer,表示底部 --></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>footer</span><span class="token punctuation">></span></span> </code></pre> <p><code><nav></code>表示网页中的导航</p> <p><code><aside></code> 表示边的解释,不是主要内容但是是相关内容,侧边栏</p> <p><code><article></code>表示文章</p> <p>本身显示效果并没有任何区别,css来修饰</p> <p><code><section></code>表示一个独立的区块,上面的标签都不能表示使用section</p> <p><code><div></code>万用,div是<mark>最常用的</mark>,可以代替上面所有</p> <p><code><span></code>是行内元素,用于在网页中选取文字</p> <blockquote> <p>这些标签显示效果都是一样的就是语义的差别</p> </blockquote> </div> </div>�������������������������������� </div> </div> </div> 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