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HTML基础内容详解

巴扎黑
Release： 2017-04-15 09:05:40
Original
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HTML简介

什么是HTML

  • HTML(Htyper Text Markup Language)：即超文本标记语言。

  • 超文本：指可以包含图片、链接，甚至音乐、程序等非文字元素。

  • 标记语言：由标记(标签)构成的语言。

什么是标签

  • 由一对尖括号包裹的单词构成，例如:

  • 标签不区分大小写， 和 一样，推荐使用小写。

  • 有些标签使用一个标签即可，叫做自闭和标签，例如:

  • 标签可以嵌套，但是不能交叉嵌套

什么是标签属性

  • 通常是以键值对形式出现的，例如 name="nick"

  • 属性只能出现在开始标签或自闭和标签中

  • 属性名字全部小写

  • 属性值必须使用双引号或单引号包裹 例如，name="nick"

  • 如果属性值和属性名完全一样.直接写属性名即可，例如：readonly

HTML5基本结构

<!DOCTYPE HTML>
<html>
    <head>
    </head>
    <body>
    </body>
</html>
Copy after login
Copy after login

HTML5如何指定字符集

  • 使用Content-Type指定字符集<br><meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />

  • 直接使用charset指定字符集<br><meta charset="UTF-8" />

<hr>

标签

</h3> <p>显示在浏览器的标题栏</p> <h3><base/></h3> <p>为页面上的所有链接规定默认地址或默认目标。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Title</title>     <base href="https://segmentfault.com/u/jerry_fe/"/>     <base target="_blank" /> </head> <body>     <img src="jerry.png" alt="图片加载失败。。。"/>     <a href="https://segmentfault.com/u/jerry_fe/">my blogs</a> </body> </html></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>以上代码中，<img>的src属性时一个相对路径，因为<head>中通过base标签设置了链接的默认地址，<br>所以img的src实际的地址是“https://segmentfault.com/u/je...”。<br>而a标签中只是指定了href，并未指定target属性，所以也会使用base中设置的target属性的值。</p> <h3><link/></h3> <p>引用外部文档，常见于引用外部样式。重要属性有三个：rel、href、type。<br><strong>rel用于规定文档与被链接文档之间的关系【<em>注：必须</em>】：</strong></p> <ul class=" list-paddingleft-2"> <li><p>rel="dns-prefetch"  预先解析缓存文档中使用的域名，目的是为了提高网页访问速度。使用场景：在一个网页频繁使用其他域名资源时。</p></li> <li> <p>rel="shortcut icon"或rel="icon"  在收藏和标题栏上用于显示的图标。示例：<link rel="icon" href="https://segmentfault.com/u/je...。注意：IE浏览器只支持ico格式，为了兼容IE，图片文件最好采用ico格式。</p></li><li><p>rel="stylesheet" 引用外部样式表。</p></li><li><p>rel="nofollow" 用于指示搜索引擎不要追踪（爬虫不要抓取），从而减少垃圾链接。使用场景：不希望被信任或是不希望被搜索引擎录入的网站。</p></li></ul><p><strong>href用于规定资源的路径（绝对路径/相对路径）【<em>注：必须</em>】。</strong><br/><strong>type用于规定被链接文档的MIME类型，用于明确文件的打开方式，【<em>注：非必须</em>】。例如：.css文件的MIME类型为text/css，而.ico文件的MIME类型为image/x-icon。</strong></p><h3><meta/></p> <p>用于定义与该HTML文档相关的元数据。最常见的用途是指定当前文档所用的字符集<code><meta charset="UTF-8"/></code><br>重要的属性有三个：http-equiv、name、content<br><strong>http-equiv把content属性值关联到http头部，可能的值为：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong><em>content-type</em></strong> 用于规定浏览器接受的文档类型，一般为text/html，即content的值一般设为text/html。</p></li> <li><p><strong><em>refresh</em></strong> 用于规定网页自动刷新的频率，时间以秒为单位（切记不是毫秒），也可设定刷新后跳转的路径，即content的值一般设为刷新的间隔秒数以及跳转路径。</p></li> <li> <p><strong><em>expires</em></strong> 用于设定网页到期时间，一旦到期，必须到服务器上重传。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <meta http-equiv="refresh" content="2"> <meta http-equiv="refresh" content="2;URL=https://www.baidu.com"> <meta http-equiv="expires" content="6 Jun 2016"/></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <p><strong>name为content属性值赋予一个含义或功能，可能的值为：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong><em>keywords</em></strong> 将content值定义为供搜索引擎抓取信息的关键字</p></li> <li><p><strong><em>description</em></strong> 将content值定义为搜索引擎搜索后，在搜索结果中显示的简单网页描述</p></li> <li><p><strong><em>author</em></strong> 将content值规定为网页制作者的信息</p></li> <li> <p><strong><em>generator</em></strong> 将content值规定为网页生成工具的信息</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="keywords" content="我是关键字"> <meta name="description" content="我是简要描述"> <meta name="author" content="https://segmentfault.com/u/jerry_fe"> <meta name="generator" content="用以说明生成工具"></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <p><strong>content  定义与http-equiv或name属性相关的元信息，是必要的属性。</strong></p> <hr> <h1><body>标签</h1> <h3>1.块级元素(block)和内联元素(inline)</h3> <p><strong>块级元素：</strong><h1>~<h6>、<p>、<p>、<ol>、<ul>、<table>、<form><br><strong>行内元素：</strong><code><a></code>、<img>、<input>、<span>、<textarea>、<code><sub></code>、<code><sup></code></p> <p><strong>block元素的特点：</strong></p> <ul class=" list-paddingleft-2"> <li><p>总是在新行上开始；</p></li> <li><p>行高以及外边距和内边距都可控制；</p></li> <li><p>宽度默认是容器的100%，除非设定一个宽度；</p></li> <li><p>可容纳内联元素和其他块元素。</p></li> </ul> <p><strong>inline（内联）元素的特点：</strong></p> <ul class=" list-paddingleft-2"> <li><p>和其他元素都在一行上；</p></li> <li><p>行高及外边距和内边距不可改变；</p></li> <li><p>宽度就是它的文字或图片的宽度，不可改变；</p></li> <li><p>只能容纳文本或者其他内联元素。</p></li> </ul> <p><strong>行内元素，需要注意：</strong></p> <ul class=" list-paddingleft-2"> <li><p>设置宽度width无效；</p></li> <li><p>设置高度height无效，可以通过line-height来设置；</p></li> <li><p>设置margin只有左右margin有效，上下无效；</p></li> <li><p>设置padding只有左右padding有效，上下则无效。注意元素范围是增大了，但是对元素周围的内容是没影响的。</p></li> </ul> <h3>2.基本标签</h3> <p><h1>~<h6>: 标题标签<br><p>: 段落标签，包裹的内容被换行，并且上下内容之间有一行空白。<br>　　　　style="text-indent: 2em"可以设置样式为首行缩进两个字符。<br>　　　　<blockquote></blockquote>可以用来设置整个段落的缩进。<br><code><strong> <b></code>: 加粗标签<br><strike>: 为文字加上一条中线<br><u>: 文字下方加下划线<br><code><em> <i></code>: 文字变成斜体<br><code><sup> <sub></code>: 上角标 和 下角标<br><code><br></code>: 换行<br><code><hr></code>: 水平线<br><p>: 块标签。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">  块级标签常用于布局，行级标签常用于显示内容。   p的显示通常使用id或class来标识。id为唯一的标签标识，class为标签的类标识。   p的大小是由内容来决定的，默认情况下，高度由内容的高度决定，宽度适应屏幕。</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><span>: 可以容纳其他元素，是一个容器。</p> <h3>3.特殊符号</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"    &quot; < &lt; >    &gt; 空格  ©    &copy; &    &amp; ¥    &yen; £    &pound;</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <h3>4.<code><a></code>超链接标签（锚标签）</h3> <p>重要属性有三个：href、target、name</p> <ul class=" list-paddingleft-2"> <li><p>href  超链接地址：可以是Web上任意资源，包括图片，网页，样式，脚本文件等。href="#"时，表示被链接页面就是当前页面。</p></li> <li><p>target  文档打开时要显示的目标位置，属性值一般有：_blank（新窗口中打开）、_self（默认，在超链接所在的容器中打开）、_parent（在超链接的父容器中打开）、_top（超链接所在的顶层容器中打开）、name（名称为name的框架中打开）。</p></li> <li><p>name  锚标记名称。作用：跳转到文档的某个地方。返回首页。</p></li> </ul> <p>网页跳转：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><a href="https://segmentfault.com/u/jerry_fe/" target="_blank">Nick Blogs</a></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>锚标记跳转：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><a name="mao"><h3>这是一个锚标记</h3></a> <p style="height: 800px"></p> <a href="#mao">跳转至锚标记</a></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <h3>5.<img>图片标签</h3> <p>重要属性有：src、title、alt、width、height、align。</p> <ul class=" list-paddingleft-2"> <li><p>src  图片地址</p></li> <li><p>title  鼠标悬浮在图片上的文字</p></li> <li><p>alt  图片找不到时要替换的文字。如果图片资源使用的是外网资源，则不会显示要替换的文字。如果使用的是本网站的资源（相对路径给出），则找不到图片时会显示替换的文字，并保留图片设置的宽高结构。</p></li> <li><p>align  图片周围文字的垂直对齐情况。常用的属性值有：top（与图片的顶部对齐）、middle（与图片的中部对齐）、bottom（默认，与图片的底部对齐）。</p></li> <li><p>width  图片的宽</p></li> <li> <p>height  图片的高 (宽高两个属性，若只写一个会，自动等比缩放)</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><img src="https://segmentfault.com/u/jerry_fe/jerry.png" alt="图片加载失败。。。" title="This is a picture."/></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <h3>6.列表标签</h3> <p><ul>: 无序列表标签</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">    <li>: 列表中的每一项.</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><ol>: 有序列表标签</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">    <li>: 列表中的每一项.</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><li>主要的属性有：type、value两个:</p> <ul class=" list-paddingleft-2"> <li><p>type指明列表项的类型，属性值有：A，a，I，i，1，disc（实心圆），square（实心正方形），circle（空心圆）。</p></li> <li><p>value表示序号值从几开始。</p></li> </ul> <p><dl> 定义列表</p> <ul class=" list-paddingleft-2"> <li><p><dt> 列表标题</p></li> <li> <p><dd> 列表项</p> <p><ul></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <li type="circle">A</li>  <li type="1">B</li>  <li type="1">C</li></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></ul><br> <ol></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <li value="3">3</li>  <li>4</li></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></ol><br> <dl></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <dt><i>标题</i></dt>  <dd>第一项</dd>  <dd>第二项</dd>  <dd>第三项</dd></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></dl></p> </li> </ul> <h3>7.<table> 表格标签</h3> <table> <thead><tr class="firstRow"> <th>序号</th> <th>姓名</th> </tr></thead> <tbody> <tr> <th>1.</th> <td>Jerry</td> </tr> <tr> <th>2.</th> <td>Ferry</td> </tr> </tbody> </table> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><table border="1">     <thead>         <tr>             <th>序号</th>             <th>姓名</th>         </tr>     </thead>     <tbody>         <tr>             <th>1.</th>             <td>Jerry</td>         </tr>         <tr>             <th>2.</th>             <td>Ferry</td>         </tr>     </tbody> </table></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><strong>table标签的主要属性：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong>border</strong>     表格边框</p></li> <li><p><strong>align</strong>      水平对齐方式</p></li> <li><p><strong>bgcolor</strong>    背景颜色</p></li> <li><p><strong>cellpadding</strong> 内边距，单元格与内容之间的距离</p></li> <li><p><strong>cellspacing</strong> 外边距，单元格的间距，设置为0时，表格变为实线表格</p></li> <li><p><strong>width</strong> 表格的宽度，可以用%或者像素，最好通过css来设置长宽</p></li> </ul> <p><strong><caption></strong> 表格的标题<br><strong><tr></strong> 表格的行<br><strong><th></strong> 表格的表头名称，与<td>不同在于文字采用加粗居中的形式显示<br><strong><td></strong> 单元格，用来显示表格内容<br><strong><thead></strong> 表格头部，使结构更加分明<br><strong><tbody></strong> 表格主体部分，使结构更加分明<br><strong>rowspan</strong> 单元格竖跨多少行，作用在th或者td上<br><strong>colspan</strong> 单元格横跨多少列（即合并单元格），作用在th或者td上。（即横跨、竖跨都是作用在th或td上）</p> <h3>8.<form>表单标签</h3> <p><strong>表单属性</strong><br>HTML 表单用于接收不同类型的用户输入，用户提交表单时向服务器传输数据，从而实现用户与Web服务器的交互。<br>属性：action、method、enctype</p> <ul class=" list-paddingleft-2"> <li><p><strong><em>action</em></strong> 表单要提交的地址，用于处理表单的内容（一般是提交到后台的一个接口，这个接口可以是java写成的，提交到这个接口后后台就知道如何处理这些数据了）。</p></li> <li><p><strong><em>method</em></strong>  提交的方法，默认是get方式提交。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>get</strong>:1.提交的键值对显示在地址栏url后面; 2.安全性相对较差; 3.对提交内容的长度有限制</p></li> <li><p><strong>post</strong>:1.提交的键值对不显示在地址栏; 2.安全性相对较高； 3.对提交内容的长度理论上无限制</p></li> </ul> <li><p><strong><em>enctype</em></strong> 对表单数据进行编码</p></li> </ul> <p><strong>表单元素</strong><br><input> type属性可能的值：</p> <ul class=" list-paddingleft-2"> <li><p><strong><em>text</em></strong> 文本框输入（type的默认类型）</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>autocomplete</strong>（自动完成输入的内容，要求表单元素要有name属性才有自动完成的效果，off表示自动完成不可用，on表示自动完成可用）</p></li> <li><p><strong>disabled</strong>（设置或者获取控件的状态，默认是false即可用，等于true时不可用，不能输入内容）</p></li> </ul> <li><p><strong><em>password</em></strong>密码框。（以下属性text和password共有）</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>size</strong>（指定表单元素的初始宽度。当type为text或password时，表单元素的大小以字符为单位，对于其他元素，宽度以像素为单位）</p></li> <li><p><strong>maxlength</strong>（type为text或password时，表示输入的最大字符数），有利于防止sql的注入攻击</p></li> <li><p><strong>readonly</strong>设置为只读状态</p></li> <li><p><strong>placeholder</strong>设置框内预置内容(灰色)，焦点选中时消失</p></li> </ul> <li><p><strong><em>radio</em></strong> 单选按钮</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>name</strong>（将name的值设置为相同值，才表示一组数据，才能实现单选功能）</p></li> <li><p><strong>value</strong>（必须要写，提交到服务器的key值，实际开发过程中value一般是编号）</p></li> <li><p><strong>checked</strong>（设置是否被默认选中）</p></li> </ul> <li><p><strong><em>checkbox</em></strong>  复选框</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>name</strong>（将name的值设置为相同值，才表示一组数据，才能添加到同一value值列表并提交到服务器）</p></li> <li><p><strong>value</strong>（必须要写，提交到服务器的key值，实际开发过程中value一般是编号）</p></li> <li><p><strong>checked</strong>（设置是否被默认选中）</p></li> </ul> <li><p><strong><em>file</em></strong>  文件域，用于上传文件（不同的浏览器表现形式不同）</p></li> <li><p><strong><em>submit</em></strong>  提交按钮。用于提交表单。</p></li> <li><p><strong><em>reset</em></strong>  重置按钮。清空表单的输入，恢复到表单默认的状态。</p></li> <li><p><strong><em>button</em></strong>  普通按钮。一般结合javascript使用。</p></li> <li><p><strong><em>image</em></strong>  图片按钮，用来提交表单，与submit是一样的效果。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>src（图片路径）</p></li></ul> <li><p><strong><em>hidden</em></strong>  隐藏字段。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value（隐藏的内容）</p></li></ul> <li><p><strong><em>color</em></strong>  颜色标签。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value 指定颜色值（采用#十六进制数表示）。</p></li></ul> <li><p><strong><em>date</em></strong>  日期。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value值指定默认的日期，格式为<strong><em>*-</em></strong>-*（年月日）。</p></li></ul> <li><p><strong><em>datetime-local</em></strong>  显示本地时间</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value值指定默认的时间，格式为2017-04-13T23:10:10（年月日T时分秒）。</p></li></ul> <li><p><strong><em>number</em></strong>  数字向上或者向下滑动。可以填数字然后向上或者向下选择不同的值。</p></li> <li><p><strong><em>range</em></strong>  滑动标签。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p>min（指定最小值）</p></li> <li><p>max（指定最大值）</p></li> <li><p>value（指定当前默认值）。</p></li> </ul> <li><p><strong><em>week</em></strong>  每年的周数。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value指定哪一年第几周，格式为2017-W20（2017年第20周）。</p></li></ul> </ul> <p><textarea> 文本域标签。默认表现形式是可以输入很多行文本的文本框。</p> <ul class=" list-paddingleft-2"> <li><p><strong>name</strong> 表单提交项的key</p></li> <li><p><strong>cols</strong> 设置文本域宽度</p></li> <li><p><strong>rows</strong> 设置文本域高度，即行数</p></li> </ul> <p><select> 下拉框标签。使用时要结合<option>子标签一起使用。</p> <ul class=" list-paddingleft-2"> <li><p><strong>name</strong> 表单提交项的key</p></li> <li><p><strong>size</strong> 选项个数</p></li> <li><p><strong>multiple</strong> 多选</p></li> <li><p><strong><option></strong> 下拉选中的每一项</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p>value（表单提交项的值）</p></li> <li><p>selected（selected下拉项默认被选中）</p></li> </ul> <li><p><strong><optgroup></strong> 为同类项加上分组</p></li> </ul> <p><label> 把元素与文本结合起来<br>友好设计：不只是选中复选框才能选中并打钩，要求点击对应的文字也能选中该复选框。<br>这种情况下要用到<label>标签的for属性（设置或获取给定标签对象指定到的对象，值=另一个元素的id号即可）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><label for="name">姓名</label> <input id="name" type="text"></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><fieldset> 对表单中的相关元素进行分组</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><fieldset>     <legend>温馨提示</legend>     <p align="middle">不要忘记点赞哦 ==</p> </fieldset></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>value: 表单提交项的值<br>对于不同的输入类型，value 属性的用法也不同：</p> <ul class=" list-paddingleft-2"> <li><p>type="button", "reset", "submit" - 定义按钮上的显示的文本</p></li> <li><p>type="text", "password", "hidden" - 定义输入字段的初始值</p></li> <li><p>type="checkbox", "radio", "image" - 定义与输入相关联的值</p></li> </ul> <p class="article fmt article__content"><br></p> <h1>HTML简介</h1> <h3>什么是HTML</h3> <ul class=" list-paddingleft-2"> <li><p>HTML(Htyper Text Markup Language)：即超文本标记语言。</p></li> <li><p>超文本：指可以包含图片、链接，甚至音乐、程序等非文字元素。</p></li> <li><p>标记语言：由标记(标签)构成的语言。</p></li> </ul> <h3>什么是标签</h3> <ul class=" list-paddingleft-2"> <li><p>由一对尖括号包裹的单词构成，例如:<html></p></li> <li><p>标签不区分大小写，<html> 和 <HTML>一样，推荐使用小写。</p></li> <li><p>有些标签使用一个标签即可，叫做自闭和标签，例如: <br/><hr/><input/><img/></p></li> <li><p>标签可以嵌套，但是不能交叉嵌套</p></li> </ul> <h3>什么是标签属性</h3> <ul class=" list-paddingleft-2"> <li><p>通常是以键值对形式出现的，例如 name="nick"</p></li> <li><p>属性只能出现在开始标签或自闭和标签中</p></li> <li><p>属性名字全部小写</p></li> <li><p>属性值必须使用双引号或单引号包裹 例如，name="nick"</p></li> <li><p>如果属性值和属性名完全一样.直接写属性名即可，例如：readonly</p></li> </ul> <h3>HTML5基本结构</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><!DOCTYPE HTML> <html>     <head>     </head>     <body>     </body> </html></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <h3>HTML5如何指定字符集</h3> <ul class=" list-paddingleft-2"> <li><p>使用Content-Type指定字符集<br><code><meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /></code></p></li> <li><p>直接使用charset指定字符集<br><code><meta charset="UTF-8" /></code></p></li> </ul> <hr> <h1><head>标签</h1> <h3><title></h3> <p>显示在浏览器的标题栏</p> <h3><base/></h3> <p>为页面上的所有链接规定默认地址或默认目标。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Title</title>     <base href="https://segmentfault.com/u/jerry_fe/"/>     <base target="_blank" /> </head> <body>     <img src="jerry.png" alt="图片加载失败。。。"/>     <a href="https://segmentfault.com/u/jerry_fe/">my blogs</a> </body> </html></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>以上代码中，<img>的src属性时一个相对路径，因为<head>中通过base标签设置了链接的默认地址，<br>所以img的src实际的地址是“https://segmentfault.com/u/je...”。<br>而a标签中只是指定了href，并未指定target属性，所以也会使用base中设置的target属性的值。</p> <h3><link/></h3> <p>引用外部文档，常见于引用外部样式。重要属性有三个：rel、href、type。<br><strong>rel用于规定文档与被链接文档之间的关系【<em>注：必须</em>】：</strong></p> <ul class=" list-paddingleft-2"> <li><p>rel="dns-prefetch"  预先解析缓存文档中使用的域名，目的是为了提高网页访问速度。使用场景：在一个网页频繁使用其他域名资源时。</p></li> <li> <p>rel="shortcut icon"或rel="icon"  在收藏和标题栏上用于显示的图标。示例：<link rel="icon" href="https://segmentfault.com/u/je...。注意：IE浏览器只支持ico格式，为了兼容IE，图片文件最好采用ico格式。</p></li><li><p>rel="stylesheet" 引用外部样式表。</p></li><li><p>rel="nofollow" 用于指示搜索引擎不要追踪（爬虫不要抓取），从而减少垃圾链接。使用场景：不希望被信任或是不希望被搜索引擎录入的网站。</p></li></ul><p><strong>href用于规定资源的路径（绝对路径/相对路径）【<em>注：必须</em>】。</strong><br/><strong>type用于规定被链接文档的MIME类型，用于明确文件的打开方式，【<em>注：非必须</em>】。例如：.css文件的MIME类型为text/css，而.ico文件的MIME类型为image/x-icon。</strong></p><h3><meta/></p> <p>用于定义与该HTML文档相关的元数据。最常见的用途是指定当前文档所用的字符集<code><meta charset="UTF-8"/></code><br>重要的属性有三个：http-equiv、name、content<br><strong>http-equiv把content属性值关联到http头部，可能的值为：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong><em>content-type</em></strong> 用于规定浏览器接受的文档类型，一般为text/html，即content的值一般设为text/html。</p></li> <li><p><strong><em>refresh</em></strong> 用于规定网页自动刷新的频率，时间以秒为单位（切记不是毫秒），也可设定刷新后跳转的路径，即content的值一般设为刷新的间隔秒数以及跳转路径。</p></li> <li> <p><strong><em>expires</em></strong> 用于设定网页到期时间，一旦到期，必须到服务器上重传。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <meta http-equiv="refresh" content="2"> <meta http-equiv="refresh" content="2;URL=https://www.baidu.com"> <meta http-equiv="expires" content="6 Jun 2016"/></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <p><strong>name为content属性值赋予一个含义或功能，可能的值为：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong><em>keywords</em></strong> 将content值定义为供搜索引擎抓取信息的关键字</p></li> <li><p><strong><em>description</em></strong> 将content值定义为搜索引擎搜索后，在搜索结果中显示的简单网页描述</p></li> <li><p><strong><em>author</em></strong> 将content值规定为网页制作者的信息</p></li> <li> <p><strong><em>generator</em></strong> 将content值规定为网页生成工具的信息</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="keywords" content="我是关键字"> <meta name="description" content="我是简要描述"> <meta name="author" content="https://segmentfault.com/u/jerry_fe"> <meta name="generator" content="用以说明生成工具"></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <p><strong>content  定义与http-equiv或name属性相关的元信息，是必要的属性。</strong></p> <hr> <h1><body>标签</h1> <h3>1.块级元素(block)和内联元素(inline)</h3> <p><strong>块级元素：</strong><h1>~<h6>、<p>、<p>、<ol>、<ul>、<table>、<form><br><strong>行内元素：</strong><code><a></code>、<img>、<input>、<span>、<textarea>、<code><sub></code>、<code><sup></code></p> <p><strong>block元素的特点：</strong></p> <ul class=" list-paddingleft-2"> <li><p>总是在新行上开始；</p></li> <li><p>行高以及外边距和内边距都可控制；</p></li> <li><p>宽度默认是容器的100%，除非设定一个宽度；</p></li> <li><p>可容纳内联元素和其他块元素。</p></li> </ul> <p><strong>inline（内联）元素的特点：</strong></p> <ul class=" list-paddingleft-2"> <li><p>和其他元素都在一行上；</p></li> <li><p>行高及外边距和内边距不可改变；</p></li> <li><p>宽度就是它的文字或图片的宽度，不可改变；</p></li> <li><p>只能容纳文本或者其他内联元素。</p></li> </ul> <p><strong>行内元素，需要注意：</strong></p> <ul class=" list-paddingleft-2"> <li><p>设置宽度width无效；</p></li> <li><p>设置高度height无效，可以通过line-height来设置；</p></li> <li><p>设置margin只有左右margin有效，上下无效；</p></li> <li><p>设置padding只有左右padding有效，上下则无效。注意元素范围是增大了，但是对元素周围的内容是没影响的。</p></li> </ul> <h3>2.基本标签</h3> <p><h1>~<h6>: 标题标签<br><p>: 段落标签，包裹的内容被换行，并且上下内容之间有一行空白。<br>　　　　style="text-indent: 2em"可以设置样式为首行缩进两个字符。<br>　　　　<blockquote></blockquote>可以用来设置整个段落的缩进。<br><code><strong> <b></code>: 加粗标签<br><strike>: 为文字加上一条中线<br><u>: 文字下方加下划线<br><code><em> <i></code>: 文字变成斜体<br><code><sup> <sub></code>: 上角标 和 下角标<br><code><br></code>: 换行<br><code><hr></code>: 水平线<br><p>: 块标签。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">  块级标签常用于布局，行级标签常用于显示内容。   p的显示通常使用id或class来标识。id为唯一的标签标识，class为标签的类标识。   p的大小是由内容来决定的，默认情况下，高度由内容的高度决定，宽度适应屏幕。</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><span>: 可以容纳其他元素，是一个容器。</p> <h3>3.特殊符号</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"    &quot; < &lt; >    &gt; 空格  ©    &copy; &    &amp; ¥    &yen; £    &pound;</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <h3>4.<code><a></code>超链接标签（锚标签）</h3> <p>重要属性有三个：href、target、name</p> <ul class=" list-paddingleft-2"> <li><p>href  超链接地址：可以是Web上任意资源，包括图片，网页，样式，脚本文件等。href="#"时，表示被链接页面就是当前页面。</p></li> <li><p>target  文档打开时要显示的目标位置，属性值一般有：_blank（新窗口中打开）、_self（默认，在超链接所在的容器中打开）、_parent（在超链接的父容器中打开）、_top（超链接所在的顶层容器中打开）、name（名称为name的框架中打开）。</p></li> <li><p>name  锚标记名称。作用：跳转到文档的某个地方。返回首页。</p></li> </ul> <p>网页跳转：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><a href="https://segmentfault.com/u/jerry_fe/" target="_blank">Nick Blogs</a></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>锚标记跳转：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><a name="mao"><h3>这是一个锚标记</h3></a> <p style="height: 800px"></p> <a href="#mao">跳转至锚标记</a></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <h3>5.<img>图片标签</h3> <p>重要属性有：src、title、alt、width、height、align。</p> <ul class=" list-paddingleft-2"> <li><p>src  图片地址</p></li> <li><p>title  鼠标悬浮在图片上的文字</p></li> <li><p>alt  图片找不到时要替换的文字。如果图片资源使用的是外网资源，则不会显示要替换的文字。如果使用的是本网站的资源（相对路径给出），则找不到图片时会显示替换的文字，并保留图片设置的宽高结构。</p></li> <li><p>align  图片周围文字的垂直对齐情况。常用的属性值有：top（与图片的顶部对齐）、middle（与图片的中部对齐）、bottom（默认，与图片的底部对齐）。</p></li> <li><p>width  图片的宽</p></li> <li> <p>height  图片的高 (宽高两个属性，若只写一个会，自动等比缩放)</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><img src="https://segmentfault.com/u/jerry_fe/jerry.png" alt="图片加载失败。。。" title="This is a picture."/></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> </li> </ul> <h3>6.列表标签</h3> <p><ul>: 无序列表标签</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">    <li>: 列表中的每一项.</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><ol>: 有序列表标签</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">    <li>: 列表中的每一项.</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><li>主要的属性有：type、value两个:</p> <ul class=" list-paddingleft-2"> <li><p>type指明列表项的类型，属性值有：A，a，I，i，1，disc（实心圆），square（实心正方形），circle（空心圆）。</p></li> <li><p>value表示序号值从几开始。</p></li> </ul> <p><dl> 定义列表</p> <ul class=" list-paddingleft-2"> <li><p><dt> 列表标题</p></li> <li> <p><dd> 列表项</p> <p><ul></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <li type="circle">A</li>  <li type="1">B</li>  <li type="1">C</li></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></ul><br> <ol></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <li value="3">3</li>  <li>4</li></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></ol><br> <dl></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> <dt><i>标题</i></dt>  <dd>第一项</dd>  <dd>第二项</dd>  <dd>第三项</dd></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p></dl></p> </li> </ul> <h3>7.<table> 表格标签</h3> <table> <thead><tr class="firstRow"> <th>序号</th> <th>姓名</th> </tr></thead> <tbody> <tr> <th>1.</th> <td>Jerry</td> </tr> <tr> <th>2.</th> <td>Ferry</td> </tr> </tbody> </table> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><table border="1">     <thead>         <tr>             <th>序号</th>             <th>姓名</th>         </tr>     </thead>     <tbody>         <tr>             <th>1.</th>             <td>Jerry</td>         </tr>         <tr>             <th>2.</th>             <td>Ferry</td>         </tr>     </tbody> </table></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><strong>table标签的主要属性：</strong></p> <ul class=" list-paddingleft-2"> <li><p><strong>border</strong>     表格边框</p></li> <li><p><strong>align</strong>      水平对齐方式</p></li> <li><p><strong>bgcolor</strong>    背景颜色</p></li> <li><p><strong>cellpadding</strong> 内边距，单元格与内容之间的距离</p></li> <li><p><strong>cellspacing</strong> 外边距，单元格的间距，设置为0时，表格变为实线表格</p></li> <li><p><strong>width</strong> 表格的宽度，可以用%或者像素，最好通过css来设置长宽</p></li> </ul> <p><strong><caption></strong> 表格的标题<br><strong><tr></strong> 表格的行<br><strong><th></strong> 表格的表头名称，与<td>不同在于文字采用加粗居中的形式显示<br><strong><td></strong> 单元格，用来显示表格内容<br><strong><thead></strong> 表格头部，使结构更加分明<br><strong><tbody></strong> 表格主体部分，使结构更加分明<br><strong>rowspan</strong> 单元格竖跨多少行，作用在th或者td上<br><strong>colspan</strong> 单元格横跨多少列（即合并单元格），作用在th或者td上。（即横跨、竖跨都是作用在th或td上）</p> <h3>8.<form>表单标签</h3> <p><strong>表单属性</strong><br>HTML 表单用于接收不同类型的用户输入，用户提交表单时向服务器传输数据，从而实现用户与Web服务器的交互。<br>属性：action、method、enctype</p> <ul class=" list-paddingleft-2"> <li><p><strong><em>action</em></strong> 表单要提交的地址，用于处理表单的内容（一般是提交到后台的一个接口，这个接口可以是java写成的，提交到这个接口后后台就知道如何处理这些数据了）。</p></li> <li><p><strong><em>method</em></strong>  提交的方法，默认是get方式提交。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>get</strong>:1.提交的键值对显示在地址栏url后面; 2.安全性相对较差; 3.对提交内容的长度有限制</p></li> <li><p><strong>post</strong>:1.提交的键值对不显示在地址栏; 2.安全性相对较高； 3.对提交内容的长度理论上无限制</p></li> </ul> <li><p><strong><em>enctype</em></strong> 对表单数据进行编码</p></li> </ul> <p><strong>表单元素</strong><br><input> type属性可能的值：</p> <ul class=" list-paddingleft-2"> <li><p><strong><em>text</em></strong> 文本框输入（type的默认类型）</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>autocomplete</strong>（自动完成输入的内容，要求表单元素要有name属性才有自动完成的效果，off表示自动完成不可用，on表示自动完成可用）</p></li> <li><p><strong>disabled</strong>（设置或者获取控件的状态，默认是false即可用，等于true时不可用，不能输入内容）</p></li> </ul> <li><p><strong><em>password</em></strong>密码框。（以下属性text和password共有）</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>size</strong>（指定表单元素的初始宽度。当type为text或password时，表单元素的大小以字符为单位，对于其他元素，宽度以像素为单位）</p></li> <li><p><strong>maxlength</strong>（type为text或password时，表示输入的最大字符数），有利于防止sql的注入攻击</p></li> <li><p><strong>readonly</strong>设置为只读状态</p></li> <li><p><strong>placeholder</strong>设置框内预置内容(灰色)，焦点选中时消失</p></li> </ul> <li><p><strong><em>radio</em></strong> 单选按钮</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>name</strong>（将name的值设置为相同值，才表示一组数据，才能实现单选功能）</p></li> <li><p><strong>value</strong>（必须要写，提交到服务器的key值，实际开发过程中value一般是编号）</p></li> <li><p><strong>checked</strong>（设置是否被默认选中）</p></li> </ul> <li><p><strong><em>checkbox</em></strong>  复选框</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p><strong>name</strong>（将name的值设置为相同值，才表示一组数据，才能添加到同一value值列表并提交到服务器）</p></li> <li><p><strong>value</strong>（必须要写，提交到服务器的key值，实际开发过程中value一般是编号）</p></li> <li><p><strong>checked</strong>（设置是否被默认选中）</p></li> </ul> <li><p><strong><em>file</em></strong>  文件域，用于上传文件（不同的浏览器表现形式不同）</p></li> <li><p><strong><em>submit</em></strong>  提交按钮。用于提交表单。</p></li> <li><p><strong><em>reset</em></strong>  重置按钮。清空表单的输入，恢复到表单默认的状态。</p></li> <li><p><strong><em>button</em></strong>  普通按钮。一般结合javascript使用。</p></li> <li><p><strong><em>image</em></strong>  图片按钮，用来提交表单，与submit是一样的效果。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>src（图片路径）</p></li></ul> <li><p><strong><em>hidden</em></strong>  隐藏字段。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value（隐藏的内容）</p></li></ul> <li><p><strong><em>color</em></strong>  颜色标签。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value 指定颜色值（采用#十六进制数表示）。</p></li></ul> <li><p><strong><em>date</em></strong>  日期。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value值指定默认的日期，格式为<strong><em>*-</em></strong>-*（年月日）。</p></li></ul> <li><p><strong><em>datetime-local</em></strong>  显示本地时间</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value值指定默认的时间，格式为2017-04-13T23:10:10（年月日T时分秒）。</p></li></ul> <li><p><strong><em>number</em></strong>  数字向上或者向下滑动。可以填数字然后向上或者向下选择不同的值。</p></li> <li><p><strong><em>range</em></strong>  滑动标签。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p>min（指定最小值）</p></li> <li><p>max（指定最大值）</p></li> <li><p>value（指定当前默认值）。</p></li> </ul> <li><p><strong><em>week</em></strong>  每年的周数。</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"><li><p>value指定哪一年第几周，格式为2017-W20（2017年第20周）。</p></li></ul> </ul> <p><textarea> 文本域标签。默认表现形式是可以输入很多行文本的文本框。</p> <ul class=" list-paddingleft-2"> <li><p><strong>name</strong> 表单提交项的key</p></li> <li><p><strong>cols</strong> 设置文本域宽度</p></li> <li><p><strong>rows</strong> 设置文本域高度，即行数</p></li> </ul> <p><select> 下拉框标签。使用时要结合<option>子标签一起使用。</p> <ul class=" list-paddingleft-2"> <li><p><strong>name</strong> 表单提交项的key</p></li> <li><p><strong>size</strong> 选项个数</p></li> <li><p><strong>multiple</strong> 多选</p></li> <li><p><strong><option></strong> 下拉选中的每一项</p></li> <ul class=" list-paddingleft-2" style="list-style-type: square;"> <li><p>value（表单提交项的值）</p></li> <li><p>selected（selected下拉项默认被选中）</p></li> </ul> <li><p><strong><optgroup></strong> 为同类项加上分组</p></li> </ul> <p><label> 把元素与文本结合起来<br>友好设计：不只是选中复选框才能选中并打钩，要求点击对应的文字也能选中该复选框。<br>这种情况下要用到<label>标签的for属性（设置或获取给定标签对象指定到的对象，值=另一个元素的id号即可）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><label for="name">姓名</label> <input id="name" type="text"></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p><fieldset> 对表单中的相关元素进行分组</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><fieldset>     <legend>温馨提示</legend>     <p align="middle">不要忘记点赞哦 ==</p> </fieldset></pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>value: 表单提交项的值<br>对于不同的输入类型，value 属性的用法也不同：</p> <ul class=" list-paddingleft-2"> <li><p>type="button", "reset", "submit" - 定义按钮上的显示的文本</p></li> <li><p>type="text", "password", "hidden" - 定义输入字段的初始值</p></li> <li><p>type="checkbox", "radio", "image" - 定义与输入相关联的值</p></li> </ul> <p class="comments-box-content"><br></p> </li> </ul> </li> </ul><p>The above is the detailed content of HTML基础内容详解. 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