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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
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<title>
简介 - Ciroy的技术笔记
</title>
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<div class="post-header">
<!-- title -->
<div class="post-header">
<h1 class="post-title itemprop="name headline">简介</h1>
<div class="post-data">
<time datetime="2020-12-17T00:11:48+08:00" pubdate data-updated="true">2020/12/17</time>
</div>
</div>
</div>
<div id="post-content" class="post-content" itemprop="articleBody">
<p class="post-tags">
<a href='%E7%BD%91%E9%81%93HTML.html'>网道HTML</a>
</p>
<!-- 正文 -->
<p>
<h2 id="toc_0">概述</h2>
<ul>
<li>1999年，HTML 4.01 版发布，成为广泛接受的 HTML 标准。</li>
<li>2014年，HTML 5 发布，这是目前正在使用的版本。</li>
<li>HTML 语言定义网页的结构和内容，CSS 样式表定义网页的样式，JavaScript 语言定义网页与用户的互动行为。</li>
</ul>
<p>一个基本结构</p>
<pre><code class="language-text"><!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>网页标题</title>
</head>
<body>
<p>Hello World</p>
</body>
</html>
</code></pre>
<h2 id="toc_1">基本概念</h2>
<h3 id="toc_2">标签</h3>
<pre><code class="language-markup"><title>网页标题</title>
</code></pre>
<p>没有结束标签</p>
<pre><code class="language-markup"><meta charset="utf-8">
</code></pre>
<p>标签的嵌套。</p>
<pre><code class="language-markup"><div><p>hello world</p></div>
</code></pre>
<ul>
<li>标签名大小写不敏感</li>
<li>HTML语言忽略缩进</li>
</ul>
<h3 id="toc_3">元素</h3>
<p>浏览器渲染网页时，会把 HTML 源码解析成一个标签树，每个标签都是树的一个节点（node）。这种节点就称为网页元素（element）。所以，“标签”和“元素”基本上是同义词，只是使用的场合不一样：标签是从源码角度来看，元素是从编程角度来看，比如<code><p></code>标签对应网页的<code>p</code>元素。</p>
<h3 id="toc_4">块级元素，行内元素</h3>
<ul>
<li>块级元素默认占据一个独立的区域，在网页上会自动另起一行，占据 100% 的宽度。比如<code>p</code> 元素包裹的就是占据整行</li>
<li>行内元素默认与其他元素在同一行，不产生换行。比如，<code>span</code>就是行内元素，通常用来为某些文字指定特别的样式。</li>
</ul>
<h3 id="toc_5">属性</h3>
<pre><code class="language-markup"><img src="demo.jpg" width="500">
</code></pre>
<ul>
<li>属性名是大小写不敏感的</li>
</ul>
<h2 id="toc_6">网页的基本标签</h2>
<pre><code class="language-markup"><!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
</body>
</html>
</code></pre>
<h3 id="toc_7"><code><!doctype></code> 告诉浏览器以h5方式解析网页</h3>
<h3 id="toc_8"><code><html lang="zh-CN"></code> 根元素，一个网页只能有一个<code><html></code>标签。lang 属性为默认语言</h3>
<h3 id="toc_9"><code><head></code>用于放置网页的元信息，为网页渲染提供额外信息，不会展示在网页上</h3>
<ul>
<li><code><meta></code>：设置网页的元数据。</li>
<li><code><link></code>：连接外部样式表。</li>
<li><code><title></code>：设置网页标题。</li>
<li><code><style></code>：放置内嵌的样式表。</li>
<li><code><script></code>：引入脚本。</li>
<li><code><noscript></code>：浏览器不支持脚本时，所要显示的内容。</li>
<li><code><base></code>：设置网页内部相对 URL 的计算基准。</li>
</ul>
</p>
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<script>
var postDirectoryBuild = function() {
var postChildren = function children(childNodes, reg) {
var result = [],
isReg = typeof reg === 'object',
isStr = typeof reg === 'string',
node, i, len;
for (i = 0, len = childNodes.length; i < len; i++) {
node = childNodes[i];
if ((node.nodeType === 1 || node.nodeType === 9) &&
(!reg ||
isReg && reg.test(node.tagName.toLowerCase()) ||
isStr && node.tagName.toLowerCase() === reg)) {
result.push(node);
}
}
return result;
},
createPostDirectory = function(article, directory, isDirNum) {
var contentArr = [],
titleId = [],
levelArr, root, level,
currentList, list, li, link, i, len;
levelArr = (function(article, contentArr, titleId) {
var titleElem = postChildren(article.childNodes, /^h\d$/),
levelArr = [],
lastNum = 1,
lastRevNum = 1,
count = 0,
guid = 1,
id = 'directory' + (Math.random() + '').replace(/\D/, ''),
lastRevNum, num, elem;
while (titleElem.length) {
elem = titleElem.shift();
contentArr.push(elem.innerHTML);
num = +elem.tagName.match(/\d/)[0];
if (num > lastNum) {
levelArr.push(1);
lastRevNum += 1;
} else if (num === lastRevNum ||
num > lastRevNum && num <= lastNum) {
levelArr.push(0);
lastRevNum = lastRevNum;
} else if (num < lastRevNum) {
levelArr.push(num - lastRevNum);
lastRevNum = num;
}
count += levelArr[levelArr.length - 1];
lastNum = num;
elem.id = elem.id || (id + guid++);
titleId.push(elem.id);
}
if (count !== 0 && levelArr[0] === 1) levelArr[0] = 0;
return levelArr;
})(article, contentArr, titleId);
currentList = root = document.createElement('ul');
dirNum = [0];
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}
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currentList = list;
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} else if (level < 0) {
level *= 2;
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if (level % 2) dirNum.pop();
currentList = currentList.parentNode;
}
}
dirNum[dirNum.length - 1]++;
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dirNum.join('.') + ' ' + contentArr[i] ;
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本文由 <a style="color: #BCBDB6" href="#"> Ciroygo
</a> 创作，采用 <a style="color: #BCBDB6" href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="external nofollow">知识共享署名4.0</a> 国际许可协议进行许可<br>本站文章除注明转载/出处外，均为本站原创或翻译，转载前请务必署名<br>最后编辑时间为: 2020-12-17T00:11:48+08:00
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