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index.html
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<!DOCTYPE html>
<html class="theme-next mist use-motion" lang="zh-Hans">
<head>
<meta charset="UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>
<meta name="theme-color" content="#222">
<meta http-equiv="Cache-Control" content="no-transform" />
<meta http-equiv="Cache-Control" content="no-siteapp" />
<link href="/lib/fancybox/source/jquery.fancybox.css?v=2.1.5" rel="stylesheet" type="text/css" />
<link href="/lib/font-awesome/css/font-awesome.min.css?v=4.6.2" rel="stylesheet" type="text/css" />
<link href="/css/main.css?v=5.1.4" rel="stylesheet" type="text/css" />
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png?v=5.1.4">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png?v=5.1.4">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png?v=5.1.4">
<link rel="mask-icon" href="/images/logo.svg?v=5.1.4" color="#222">
<meta name="keywords" content="Hexo, NexT" />
<meta name="description" content="遗憾遗憾重重">
<meta property="og:type" content="website">
<meta property="og:title" content="Y.Y's BLOG">
<meta property="og:url" content="http://yoursite.com/index.html">
<meta property="og:site_name" content="Y.Y's BLOG">
<meta property="og:description" content="遗憾遗憾重重">
<meta property="article:author" content="涯渊">
<meta name="twitter:card" content="summary">
<script type="text/javascript" id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Mist',
version: '5.1.4',
sidebar: {"position":"left","display":"post","offset":12,"b2t":false,"scrollpercent":false,"onmobile":false},
fancybox: true,
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
duoshuo: {
userId: '0',
author: '博主'
},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
}
};
</script>
<link rel="canonical" href="http://yoursite.com/"/>
<title>Y.Y's BLOG</title>
<meta name="generator" content="Hexo 4.2.1"></head>
<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">
<div class="container sidebar-position-left
page-home">
<div class="headband"></div>
<header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-wrapper">
<div class="site-meta ">
<div class="custom-logo-site-title">
<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
<span class="site-title">Y.Y's BLOG</span>
<span class="logo-line-after"><i></i></span>
</a>
</div>
<h1 class="site-subtitle" itemprop="description">遗憾遗憾重重</h1>
</div>
<div class="site-nav-toggle">
<button>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
</button>
</div>
</div>
<nav class="site-nav">
<ul id="menu" class="menu">
<li class="menu-item menu-item-home">
<a href="/" rel="section">
首页
</a>
</li>
<li class="menu-item menu-item-about">
<a href="/about" rel="section">
关于
</a>
</li>
<li class="menu-item menu-item-tags">
<a href="/tags" rel="section">
标签
</a>
</li>
<li class="menu-item menu-item-categories">
<a href="/categories" rel="section">
分类
</a>
</li>
<li class="menu-item menu-item-archives">
<a href="/archives" rel="section">
归档
</a>
</li>
<li class="menu-item menu-item-schedule">
<a href="/schedule" rel="section">
日程表
</a>
</li>
</ul>
</nav>
</div>
</header>
<main id="main" class="main">
<div class="main-inner">
<div class="content-wrap">
<div id="content" class="content">
<section id="posts" class="posts-expand">
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/10/08/%E5%B9%BF%E5%BA%A6%E4%BC%98%E5%85%88%E7%AE%97%E6%B3%95%20+%20%E5%90%AF%E5%8F%91%E5%BC%8F%E6%90%9C%E7%B4%A2--%E8%87%AA%E5%8A%A8%E5%AF%BB%E8%B7%AF/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="涯渊">
<meta itemprop="description" content="">
<meta itemprop="image" content="/images/avatar.gif">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Y.Y's BLOG">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/2020/10/08/%E5%B9%BF%E5%BA%A6%E4%BC%98%E5%85%88%E7%AE%97%E6%B3%95%20+%20%E5%90%AF%E5%8F%91%E5%BC%8F%E6%90%9C%E7%B4%A2--%E8%87%AA%E5%8A%A8%E5%AF%BB%E8%B7%AF/" itemprop="url">地图编辑器(广度优先算法 + 启发式搜索)</a></h2>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2020-10-08T14:06:04+08:00">
2020-10-08
</time>
</span>
<span class="post-category" >
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E5%AE%9E%E9%AA%8C/" itemprop="url" rel="index">
<span itemprop="name">实验</span>
</a>
</span>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<style>
.cell {
display:inline-block;
line-height: 7px;
width: 6px;
height: 6px;
background-color: gray;
border-bottom: solid 1px white;
border-right: solid 1px white;
vertical-align: middle;
}
#container{
width: 701px;
line-height: 0;
}
.bg-black {
background-color: black;
}
.bg-gray {
background-color: gray;
}
.bg-lightgreen {
background-color: lightgreen;
}
.bg-purple {
background-color: purple;
}
</style>
<div id="container"></div>
<button class="primary-button" onclick="localStorage['map'] = JSON.stringify(map)">
save
</button>
<button class="default-button">
clear
</button>
<script>
class Sorted {
constructor(data,compare){
this.data = data.slice();
this.compare = compare || ((a,b) => a-b)
}
take(){
if (!this.data.length){
return;
}
let min = this.data[0];
let minIndex = 0;
for (let i = 1;i < this.data.length; i++) {
if (this.compare(this.data[i],min)<0) {
min = this.data[i];
minIndex = i;
}
}
this.data[minIndex] = this.data[this.data.length - 1];
this.data.pop();
return min;
}
give(v) {
this.data.push(v);
}
}
let map = localStorage['map'] ? JSON.parse(localStorage['map']) : Array(10000).fill(0);
let container = document.getElementById('container');
for(let x = 0; x < 100; x++) {
for (let y = 0; y < 100; y++) {
let cell = document.createElement('div');
cell.classList.add("cell");
if (map[100*y + x] === 1) {
cell.classList.add('bg-black');
}
cell.addEventListener('mousemove', ()=> {
if (mousedown) {
if (clear) {
cell.classList.remove('bg-black');
map[100*y + x] = 0;
} else {
cell.classList.add('bg-black');
map[100*y + x] = 1;
}
}
})
container.appendChild(cell);
}
}
let mousedown = false;
let clear = false;
document.addEventListener('mousedown', e=> {
if (e.target.classList[0] == "default-button") {
localStorage['map'] = JSON.stringify(Array(10000).fill(0));
map = Array(10000).fill(0);
let allSelected = document.querySelectorAll('.bg-black');
for (let i = 0; i< allSelected.length; i++) {
allSelected[i].classList.remove('bg-black');
allSelected[i].classList.add('bg-gray');
}
let allSelectdPath = document.querySelectorAll('.bg-lightgreen');
for (let i = 0; i< allSelectdPath.length; i++){
allSelectdPath[i].classList.remove('bg-lightgreen');
allSelectdPath[i].classList.add('bg-gray');
}
let currentPath = document.querySelectorAll('.bg-purple');
for (let i = 0; i< currentPath.length; i++){
currentPath[i].classList.remove('bg-purple');
currentPath[i].classList.add('bg-gray');
}
}
mousedown = true;
clear = (e.which === 3)
})
document.addEventListener('mouseup', () => {
mousedown = false;
})
document.addEventListener('contextmenu', e => e.preventDefault())
function sleep(t) {
return new Promise((resolve) => {
setTimeout(resolve,t);
})
}
async function findPath(map,start,end) {
let table = Object.create(map);
var queue = [start];
async function insert (x,y,pre) {
if (x < 0 || y < 0 || x >= 100 || y >= 100) {
return ;
}
if (table[100*y+x]) {
return ;
}
await sleep(1);
// container.children[y*100 + x].style.backgroundColor = ('lightgreen')
// container.children[y*100 + x].classList.add('bg-lightgreen')
table[y*100 + x] = pre;
map[100*y+x] = -1;
queue.push([x,y]);
}
while (queue.length) {
let [x,y] = queue.shift();
if (x === end[0] && y === end[1]) {
let path = [];
while (x !== start[0] || y !== start[1]) {
console.log(x,y)
container.children[y*100 + x].classList.add('bg-purple');
path.push(map[y*100 + x]);
[x,y] = table[y*100 + x];
}
return path;
}
await insert(x-1,y,[x,y]);
await insert(x+1,y,[x,y]);
await insert(x,y-1,[x,y]);
await insert(x,y+1,[x,y]);
await insert(x-1,y-1,[x,y]);
await insert(x+1,y+1,[x,y]);
await insert(x+1,y-1,[x,y]);
await insert(x-1,y+1,[x,y]);
}
}
</script>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</div>
</article>
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/09/28/%E5%85%B3%E4%BA%8ECSS%E9%80%89%E6%8B%A9%E5%99%A8/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="涯渊">
<meta itemprop="description" content="">
<meta itemprop="image" content="/images/avatar.gif">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Y.Y's BLOG">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/2020/09/28/%E5%85%B3%E4%BA%8ECSS%E9%80%89%E6%8B%A9%E5%99%A8/" itemprop="url">关于CSS选择器</a></h2>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2020-09-28T14:06:04+08:00">
2020-09-28
</time>
</span>
<span class="post-category" >
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/CSS/" itemprop="url" rel="index">
<span itemprop="name">CSS</span>
</a>
</span>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<style>
strong + span {
color: red;
}
em ~ span {
color: blue;
}
#show_child_selector p > span {
background-color: DodgerBlue
}
#show_child_selector span {
background-color: white;
}
#pseudo_classes a:link { color: blue; }
#pseudo_classes a:visited { color: purple; }
#pseudo_classes a:hover { background: yellow; }
#pseudo_classes a:active { color: red; }
#pseudo_classes :first-child { background: #f2efea; }
#pseudo_classes :first-of-type {background: green}
#pseudo_classes :not(p) {text-decoration: underline}
#peseudo_elements_ul li {
list-style-type: none;
position: relative;
margin: 2px;
padding: 0.5em 0.5em 0.5em 2em;
background: lightgrey;
font-family: sans-serif;
}
#peseudo_elements_ul li.done {
background: #CCFF99;
}
#peseudo_elements_ul li.done::before {
content: '';
position: absolute;
border-color: #009933;
border-style: solid;
border-width: 0 0.3em 0.25em 0;
height: 1em;
top: 1.3em;
left: 0.6em;
margin-top: -1em;
transform: rotate(45deg);
width: 0.5em;
}
li.done::after {
content: " 再点击恢复";
}
</style>
<header>
<title>关于CSS选择器</title>
</header>
<main>
<div>
<h1 id="selector_type">选择器类型</h1>
<div>
<h2 id="basic_selector">基础选择器 (Basic Selectors)</h2>
<ul>
<li>
<h3 id="type_selector">元素选择器</h3>
<p>通过Node节点匹配元素,在单独使用时,寻找特定类型的元素时,元素选择器都会匹配该文档中所有此类型的元素.</p>
<pre>元素 {样式声明}</pre>
</li>
<li>
<h3 id="class_selector">类选择器</h3>
<p>CSS类选择器会根据元素的类属性中的内容匹配元素，需要完全匹配，以空白分隔</p>
<pre>.类名 {样式声明}</pre>
<p>类选择器等同于下述：</p>
<pre>[class ~= 类名] {样式声明}</pre>
</li>
<li>
<h3 id="id_selector">ID选择器</h3>
<p>根据元素中ID属性中的内容匹配元素，需要完全匹配</p>
<pre>#ID {样式声明}</pre>
<p>ID选择器等同于下述:</p>
<pre>[id = id属性的值] {样式声明}</pre>
</li>
<li>
<h3 id="universal_selector">通配选择器</h3>
<p>可以匹配任何HTML类型的元素，故可省略。在CSS3中，较经典的与命名空间搭配使用</p>
<ul>
<li><code>a|*</code>会匹配a空间下的所有元素</li>
<li><code>|*</code>会匹配所有无命名空间的元素</li>
</ul>
</li>
<li>
<h3 id="attribute_selector">属性选择器</h3>
<p>根据属性中的内容匹配元素，需要属性值完全匹配</p>
<dl>
<h4 id="attribute_selector_grammer">语法</h4>
<dt>
<code>
[<var>attr</var>]
</code>
</dt>
<dd>表示带有以attr命名的属性的所有元素</dd>
<dt>
<code>
[<var>attr</var>=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性且值等于value的所有元素
</dd>
<dt>
<code>
[<var>attr</var>~=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value是以空白分隔的值列表，匹配HTML中该属性的值是值列表之一的元素，例如class,className(类属性选择器)
</dd>
<dt>
<code>
[<var>attr</var>|=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value是value或者以value-为前缀的值，例如匹配zh-CN,zh-TW,其中zh可以作为上述value
</dd>
<dt>
<code>
[<var>attr</var>^=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value是value为前缀的值，例如匹配zh-CN,zh-TW,其中zh可以作为上述value
</dd>
<dt>
<code>
[<var>attr</var>$=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value是value为后缀的值，例如匹配abc,acbc,其中bc可以作为上述value
</dd>
<dt>
<code>
[<var>attr</var>$=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value是value为后缀的值，例如匹配abc,acbc,其中bc可以作为上述value
</dd>
<dt>
<code>
[<var>attr</var>*=<var>value</var>]
</code>
</dt>
<dd>
表示带有以attr命名的属性，value被包含于html中填写的实际的值，例如匹配abc,acbc,其中bc可以作为上述value
</dd>
<dt>
<code>
[<var>attr</var><var>operate</var><var>value</var>]
</code>
</dt>
<dd>
在属性选择器的右方括号前添加一个用空格隔开的字母 <code>i</code>（或 <code>I</code>），可以在匹配属性值时忽略大小写
</dd>
</dl>
</li>
</ul>
</div>
<div>
<h2 id="combinator">复合选择器 (Combinators)</h2>
<ul>
<li>
<h3 id="adjacent_sibling_combinator">相邻兄弟选择器</h3>
<p>介于两个选择器之间，需要两个元素同属一个父元素且相邻</p>
<code>
strong + span {
color: red;
}
</code>
<h4 id="result_adjacent_sibling_combinator">Result: </h4>
<div class="text-indent-2 result-box">
<strong>1</strong>
<span>2</span>
<span>3</span>
<strong>4</strong>
<span>5</span>
</div>
</li>
<li>
<h3 id="general_sibling_combinator">通用兄弟选择器</h3>
<p>位置无须紧邻，只须同层级，<code>A~B</code>选择<code>A</code>元素之后所有同层级<code>B</code>元素。</p>
<code>
em ~ span {
color: blue;
}
</code>
<h4 id="result_general_sibling_combinator">Result:</h4>
<div class="text-indent-2">
<em>1</em>
<span>2</span>
<span>3</span>
<em>4</em>
<span>5</span>
</div>
</li>
<li>
<h3 id="child_combinator">子选择器</h3>
<p>匹配第一个元素的子元素，孙元素及以后无法匹配</p>
<code>
#show_child_selector div > span {
color: green
}
</code>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><div class="text-indent-2" id="show_child_selector"></span><br><span class="line"> <<span class="selector-tag">p</span>></span><br><span class="line"> <<span class="selector-tag">span</span>></span><br><span class="line"> 1</span><br><span class="line"> <<span class="selector-tag">span</span>></span><br><span class="line"> 2</span><br><span class="line"> </span></span><br><span class="line"> </span></span><br><span class="line"> <span>3</span></span><br><span class="line"> </p></span><br><span class="line"></div></span><br><span class="line"><span>4</span></span><br></pre></td></tr></table></figure>
<h4 id="result_child_combinator">Result: </h4>
<div class="text-indent-2 result-box" id="show_child_selector">
<p>
<span>
1
<span>
2
</span>
</span>
<span>3</span>
</p>
</div>
<p>
注意此处若没有给二级span加样式则会继承一级span的样式
</p>
</li>
</ul>
</div>
<div>
<h2 id="pseudo_classes">伪类 (Pseudo Classes)</h2>
<ul>
<li>
<h3 id="common_pseudo_classes">常用的伪类</h3>
<dl>
<dt>
<code>:link</code>
</dt>
<dd>
匹配未被访问，且有href属性的a标签
</dd>
<dt>
<code>:visited</code>
</dt>
<dd>
匹配已被访问的链接
</dd>
<dt>
<code>:hover</code>
</dt>
<dd>
匹配光标所在的元素
</dd>
<dt>
<code>:active</code>
</dt>
<dd>
匹配已操作过，比如按钮按下过鼠标左键等
</dd>
<dt>
<code>:first-child</code>
</dt>
<dd>
表示一组同级元素中的第一个元素
</dd>
<dt>
<code>:first-of-type</code>
</dt>
<dd>
表示该标签下面的第一个标签元素
</dd>
<dt>
<code>:last-child</code>
</dt>
<dd>
表示一组同级元素中的最后一个元素
</dd>
<dt>
<code>:last-of-type</code>
</dt>
<dd>
表示该标签下面的最后一个标签元素
</dd>
<dt>
<code>:not</code>
</dt>
<dd>
表示与选择器列表不匹配的元素
</dd>
<dt>
<code>:target</code>
</dt>
<dd>
通过a标签的href属性与之对应id元素匹配
</dd>
</dl>
<figure class="highlight css"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">a</span><span class="selector-pseudo">:link</span> { <span class="attribute">color</span>: blue; }</span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">a</span><span class="selector-pseudo">:visited</span> { <span class="attribute">color</span>: purple; }</span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">a</span><span class="selector-pseudo">:hover</span> { <span class="attribute">background</span>: yellow; }</span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">a</span><span class="selector-pseudo">:active</span> { <span class="attribute">color</span>: red; }</span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">p</span><span class="selector-pseudo">:first-child</span> { <span class="attribute">background</span>: <span class="number">#f2efea</span>; }</span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">div</span>: <span class="selector-tag">first-of-type</span> {<span class="attribute">background</span>: green} </span><br><span class="line"><span class="selector-id">#pseudo_classes</span> <span class="selector-tag">not</span>(<span class="selector-tag">p</span>) {<span class="attribute">text-decoration</span>: underline}</span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">div</span> <span class="attr">id</span>=<span class="string">"pseudo_classes"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span>></span>test1<span class="tag"></<span class="name">a</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"#"</span>></span>test2<span class="tag"></<span class="name">a</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"#"</span>></span>test3<span class="tag"></<span class="name">a</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span>test4<span class="tag"><<span class="name">span</span>></span>test5<span class="tag"></<span class="name">span</span>></span><span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span>test6<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"><span class="tag"></<span class="name">div</span>></span></span><br></pre></td></tr></table></figure>
<h4 id="result_pseudo_classes">Result: </h4>
<div id="pseudo_classes" class="text-indent-2 result-box">
<a>test1</a>
<a href="#">test2</a>
<a href="https://www.bilibili.com" target="_blank" rel="noopener">test3</a>
<p>test4<span>test5</span></p>
<p>test6</p>
</div>
<p>注意：这里面first-child与first-of-type优先级一样所以被覆盖了</p>
</li>
</ul>
</div>
<div>
<h2 id="pseudo_elements">伪元素 (Pseudo Elements)</h2>
<ul>
<li>
<h3 id="common_pseudo_elements">常用的伪元素</h3>
<dl>
<dt>
<code>::before</code>
</dt>
<dd>
在选中的元素前添加样式声明
</dd>
<dt>
<code>::after</code>
</dt>
<dd>
在选中的元素后添加样式声明
</dd>
</dl>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> list = <span class="built_in">document</span>.querySelector(<span class="string">'#peseudo_elements_ul'</span>)</span><br><span class="line">list.addEventListener(<span class="string">'click'</span>,<span class="function"><span class="keyword">function</span>(<span class="params">current</span>) </span>{</span><br><span class="line"><span class="built_in">console</span>.log(current,<span class="string">'current'</span>,current.target)</span><br><span class="line"><span class="keyword">if</span>( current.target.tagName === <span class="string">'LI'</span>) {</span><br><span class="line">current.target.classList.toggle(<span class="string">'done'</span>)</span><br><span class="line">}</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<figure class="highlight css"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="selector-tag">li</span> {</span><br><span class="line"> <span class="attribute">list-style-type</span>: none;</span><br><span class="line"> <span class="attribute">position</span>: relative;</span><br><span class="line"> <span class="attribute">margin</span>: <span class="number">2px</span>;</span><br><span class="line"> <span class="attribute">padding</span>: <span class="number">0.5em</span> <span class="number">0.5em</span> <span class="number">0.5em</span> <span class="number">2em</span>;</span><br><span class="line"> <span class="attribute">background</span>: lightgrey;</span><br><span class="line"> <span class="attribute">font-family</span>: sans-serif;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">li</span><span class="selector-class">.done</span> {</span><br><span class="line"> <span class="attribute">background</span>: <span class="number">#CCFF99</span>;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">li</span><span class="selector-class">.done</span><span class="selector-pseudo">::before</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">''</span>;</span><br><span class="line"> <span class="attribute">position</span>: absolute;</span><br><span class="line"> <span class="attribute">border-color</span>: <span class="number">#009933</span>;</span><br><span class="line"> <span class="attribute">border-style</span>: solid;</span><br><span class="line"> <span class="attribute">border-width</span>: <span class="number">0</span> <span class="number">0.3em</span> <span class="number">0.25em</span> <span class="number">0</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">1em</span>;</span><br><span class="line"> <span class="attribute">top</span>: <span class="number">1.3em</span>;</span><br><span class="line"> <span class="attribute">left</span>: <span class="number">0.6em</span>;</span><br><span class="line"> <span class="attribute">margin-top</span>: -<span class="number">1em</span>;</span><br><span class="line"> <span class="attribute">transform</span>: <span class="built_in">rotate</span>(<span class="number">45deg</span>);</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">0.5em</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="selector-tag">li</span><span class="selector-class">.done</span><span class="selector-pseudo">::after</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">'再点击恢复'</span>;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">ul</span> <span class="attr">id</span>=<span class="string">"peseudo_elements_ul"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Buy milk<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Take the dog for a walk<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Exercise<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Write code<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Play music<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">li</span>></span>Relax<span class="tag"></<span class="name">li</span>></span></span><br><span class="line"><span class="tag"></<span class="name">ul</span>></span></span><br></pre></td></tr></table></figure>
<ul id="peseudo_elements_ul">
<li>Buy milk</li>
<li>Take the dog for a walk</li>
<li>Exercise</li>
<li>Write code</li>
<li>Play music</li>
<li>Relax</li>
</ul>
</li>
</ul>
</div>
</div>
<div>
<h1 id="selector_specificity">CSS选择器的优先级</h1>
<div>
<h2 id="compute_specificity">计算优先级</h2>
<p>CSS是通过进位制计算的优先级，<Strong>(ID，类，标签)</Strong>,为了好做计算，分别将其对应为（a,b,c）</p>