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关于HTML的head投标签

巴扎黑

Mar 19, 2017 pm 05:28 PM

　　HTML head 头部分的标签、元素有很多，涉及到浏览器对网页的渲染，SEO 等等，而各个浏览器内核以及各个国内浏览器厂商都有些自己的标签元素,这就造成了很多差异性。移动互联网时代，head 头部结构，移动端的 meta 元素，显得更为重要。了解每个标签的意义，写出满足自己需求的 head 头标签，是本文的目的。本篇以一丝的文章为基础，进行扩展总结介绍常用的 head 中各个标签、元素的意义以及使用场景。

　　DOCTYPE

　　DOCTYPE(Document Type)，该声明位于文档中最前面的位置，处于 html 标签之前，此标签告知浏览器文档使用哪种 HTML 或者 XHTML 规范。

　　DTD(Document Type Definition) 声明以开始，不区分大小写，前面没有任何内容，如果有其他内容(空格除外)会使浏览器在 IE 下开启怪异模式(quirks mode)渲染网页。公共 DTD，名称格式为注册//组织//类型标签//语言,注册指组织是否由国际标准化组织(ISO)注册，+表示是，-表示不是。组织即组织名称，如：W3C。类型一般是 DTD。标签是指定公开文本描述，即对所引用的公开文本的唯一描述性名称，后面可附带版本号。最后语言是 DTD 语言的 ISO 639 语言标识符，如：EN 表示英文，ZH 表示中文。XHTML 1.0 可声明三种 DTD 类型。分别表示严格版本，过渡版本，以及基于框架的 HTML 文档。

HTML 4.01 strict

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

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HTML 4.01 Transitional

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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HTML 4.01 Frameset

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

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最新 HTML5 推出更加简洁的书写，它向前向后兼容，推荐使用。
```
<!doctype html>
```
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　　在 HTML中 doctype 有两个主要目的。

对文档进行有效性验证。

　　它告诉用户代理和校验器这个文档是按照什么 DTD 写的。这个动作是被动的，每次页面加载时，浏览器并不会下载 DTD 并检查合法性，只有当手动校验页面时才启用。

决定浏览器的呈现模式

对于实际操作，通知浏览器读取文档时用哪种解析算法。如果没有写，则浏览器则根据自身的规则对代码进行解析，可能会严重影响 html 排版布局。浏览器有三种方式解析 HTML 文档。

非怪异（标准）模式
怪异模式
部分怪异（近乎标准）模式关于IE浏览器的文档模式，浏览器模式，严格模式，怪异模式，DOCTYPE 标签，可详细阅读模式？标准！的内容。

　　charset

　　声明文档使用的字符编码，

<meta charset="utf-8">

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　　html5 之前网页中会这样写：

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

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　　这两个是等效的，具体可移步阅读： vs ，所以建议使用较短的，易于记忆。

　　lang属性

　　简体中文

<html lang="zh-cmn-Hans">

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　　繁体中文

<html lang="zh-cmn-Hant">

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　　为什么 lang="zh-cmn-Hans" 而不是我们通常写的 lang="zh-CN" 呢，请移步阅读: 页头部的声明应该是用 lang="zh" 还是 lang="zh-cn"。

　　优先使用 IE 最新版本和 Chrome

<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />

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　　360 使用Google Chrome Frame

<meta name="renderer" content="webkit">

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　　360 浏览器就会在读取到这个标签后，立即切换对应的极速核。另外为了保险起见再加入

<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">

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　　这样写可以达到的效果是如果安装了 Google Chrome Frame，则使用 GCF 来渲染页面，如果没有安装 GCF，则使用最高版本的 IE 内核进行渲染。

　　相关链接：浏览器内核控制 Meta 标签说明文档

　　百度禁止转码

　　通过百度手机打开网页时，百度可能会对你的网页进行转码，脱下你的衣服，往你的身上贴狗皮膏药的广告，为此可在 head 内添加

<meta http-equiv="Cache-Control" content="no-siteapp" />

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　　相关链接：SiteApp 转码声明

　　SEO 优化部分

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padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="viewport" content="width=device-width, initial-scale=1, minimal-ui"></pre><div class="contentsignin">Salin selepas log masuk</div></div> </li> </ul> <p> 　　而如果你的网站不是响应式的，请不要使用 initial-scale 或者禁用缩放。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="viewport" content="width=device-width,user-scalable=yes"></pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　相关链接：非响应式设计的viewport</p> <p> 　　适配 iPhone 6 和 iPhone 6plus 则需要写：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="viewport" content="width=375"> <meta name="viewport" content="width=414"></pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　大部分 4.7~5 寸的安卓设备的 viewport 宽设为 360px，iPhone 6 上却是 375px，大部分 5.5 寸安卓机器（比如说三星 Note）的 viewport 宽为 400，iPhone 6 plus 上是 414px。</p> <h3> 　　ios 设备</h3> <p> 　　添加到主屏后的标题（iOS 6 新增）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="apple-mobile-web-app-title" content="标题"> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　是否启用 WebApp 全屏模式</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="apple-mobile-web-app-capable" content="yes" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　设置状态栏的背景颜色</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　只有在 "apple-mobile-web-app-capable" content="yes" 时生效</p> <p> 　　content 参数：</p> <ul class=" list-paddingleft-2"> <li><p> default 默认值。</p></li> <li><p><br></p></li> <li><p> black 状态栏背景是黑色。</p></li> <li><p><br></p></li> <li><p> black-translucent 状态栏背景是黑色半透明。如果设置为 default 或 black ,网页内容从状态栏底部开始。如果设置为 black-translucent ,网页内容充满整个屏幕，顶部会被状态栏遮挡。</p></li> </ul> <p> 　　禁止数字识自动别为电话号码</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="format-detection" content="telephone=no" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <h3> 　　iOS 图标</h3> <p> 　　rel 参数： apple-touch-icon 图片自动处理成圆角和高光等效果。 apple-touch-icon-precomposed 禁止系统自动添加效果，直接显示设计原图。 iPhone 和 iTouch，默认 57x57 像素，必须有</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-57x57-precomposed.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPad，72x72 像素，可以没有，但推荐有</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-icon-precomposed" sizes="72x72" href="/apple-touch-icon-72x72-precomposed.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　Retina iPhone 和 Retina iTouch，114x114 像素，可以没有，但推荐有</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-icon-precomposed" sizes="114x114" href="/apple-touch-icon-114x114-precomposed.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　Retina iPad，144x144 像素，可以没有，但推荐有</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-icon-precomposed" sizes="144x144" href="/apple-touch-icon-144x144-precomposed.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　IOS 图标大小在iPhone 6 plus上是180×180，iPhone 6 是120x120。适配iPhone 6 plus，则需要在中加上这段</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-icon-precomposed" sizes="180x180" href="retinahd_icon.png"></pre><div class="contentsignin">Salin selepas log masuk</div></div> <h3> 　　iOS 启动画面</h3> <p> 　　官方文档：https://developer.apple.com/library/ios/qa/qa1686/_index.html 参考文章：http://wxd.ctrip.com/blog/2013/09/ios7-hig-24/</p> <p> 　　iPad 的启动画面是不包括状态栏区域的。</p> <p> 　　iPad 竖屏 768 x 1004（标准分辨率）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="768x1004" href="/splash-screen-768x1004.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPad 竖屏 1536x2008（Retina）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="1536x2008" href="/splash-screen-1536x2008.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPad 横屏 1024x748（标准分辨率）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="1024x748" href="/Default-Portrait-1024x748.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPad 横屏 2048x1496（Retina）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="2048x1496" href="/splash-screen-2048x1496.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPhone 和 iPod touch 的启动画面是包含状态栏区域的。</p> <p> 　　iPhone/iPod Touch 竖屏 320x480 (标准分辨率)</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" href="/splash-screen-320x480.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPhone/iPod Touch 竖屏 640x960 (Retina)</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="640x960" href="/splash-screen-640x960.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPhone 5/iPod Touch 5 竖屏 640x1136 (Retina)</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" sizes="640x1136" href="/splash-screen-640x1136.png" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　添加智能 App 广告条 Smart App Banner（iOS 6+ Safari）</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="apple-itunes-app" content="app-id=myAppStoreID, affiliate-data=myAffiliateData, app-argument=myURL"> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　iPhone 6对应的图片大小是750×1294，iPhone 6 Plus 对应的是1242×2148 。</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="apple-touch-startup-image" href="launch6.png" media="(device-width: 375px)"> <link rel="apple-touch-startup-image" href="launch6plus.png" media="(device-width: 414px)"></pre><div class="contentsignin">Salin selepas log masuk</div></div> <h3> 　　Windows 8</h3> <p> 　　Windows 8 磁贴颜色</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="msapplication-TileColor" content="#000"/> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　Windows 8 磁贴图标</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="msapplication-TileImage" content="icon.png"/> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <h3> 　　rss订阅</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="alternate" type="application/rss+xml" title="RSS" href="/rss.xml" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <h3> 　　favicon icon</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><link rel="shortcut icon" type="image/ico" href="/favicon.ico" /> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　比较详细的 favicon 介绍可参考https://github.com/audreyr/favicon-cheat-sheet</p> <h3> 　　移动端的meta</h3> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-mobile-web-app-status-bar-style" content="black" /> <meta name="format-detection"content="telephone=no, email=no" /> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-mobile-web-app-status-bar-style" content="black" /> <meta name="format-detection" content="telphone=no, email=no" />  <meta name="renderer" content="webkit">  <meta http-equiv="X-UA-Compatible" content="IE=edge">  <meta name="HandheldFriendly" content="true">  <meta name="MobileOptimized" content="320">  <meta name="screen-orientation" content="portrait">  <meta name="x5-orientation" content="portrait">  <meta name="full-screen" content="yes">  <meta name="x5-fullscreen" content="true">  <meta name="browsermode" content="application">  <meta name="x5-page-mode" content="app">  <meta name="msapplication-tap-highlight" content="no"> </pre><div class="contentsignin">Salin selepas log masuk</div></div> <p> 　　这是来自 toobug 的分享总结。</p> <p> 　　更多的 meta 标签参考</p> <ul class=" list-paddingleft-2"> <li><p> COMPLETE LIST OF HTML META TAGS</p></li> <li><p><br></p></li> <li><p> 18 Meta Tags Every Webpage Should Have in 2013</p></li> </ul> <p> 　　参考文章：</p> <ul class=" list-paddingleft-2"> <li><p> 常用的 HTML 头部标签</p></li> <li><p><br></p></li> <li><p> html5_header</p></li> <li><p><br></p></li> <li><p> amazeui css</p></li> <li><p><br></p></li> <li><p> DOCTYPE</p></li> <li><p><br></p></li> <li><p> WEB 工程师和设计师必学的 10 个 IOS 8 新鲜改变</p></li> </ul><p>Atas ialah kandungan terperinci 关于HTML的head投标签. 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