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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
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var NexT = window.NexT || {};
var CONFIG = {"hostname":"shiff.top","root":"/","scheme":"Muse","version":"7.8.0","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12,"onmobile":true},"copycode":{"enable":false,"show_result":false,"style":null},"back2top":{"enable":true,"sidebar":false,"scrollpercent":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"algolia":{"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"}},"localsearch":{"enable":true,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},"path":"search.xml"};
</script>
<meta name="description" content="千里之行，始于足下">
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<meta property="og:title" content="微弱的光">
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<meta property="og:description" content="千里之行，始于足下">
<meta property="og:locale" content="zh_CN">
<meta property="article:author" content="shiff">
<meta name="twitter:card" content="summary">
<link rel="canonical" href="http://shiff.top/">
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// https://hexo.io/docs/variables.html
CONFIG.page = {
sidebar: "",
isHome : true,
isPost : false,
lang : 'zh-CN'
};
</script>
<title>微弱的光</title>
<noscript>
<style>
.use-motion .brand,
.use-motion .menu-item,
.sidebar-inner,
.use-motion .post-block,
.use-motion .pagination,
.use-motion .comments,
.use-motion .post-header,
.use-motion .post-body,
.use-motion .collection-header { opacity: initial; }
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}
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</style>
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<body itemscope itemtype="http://schema.org/WebPage">
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<input autocomplete="off" autocapitalize="off"
placeholder="搜索..." spellcheck="false"
type="search" class="search-input">
</div>
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="http://shiff.top/2024/06/17/vue%E4%B8%AD%E7%9A%84%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E9%92%A9%E5%AD%90%E5%87%BD%E6%95%B0/">
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<meta itemprop="description" content="千里之行，始于足下">
</span>
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<meta itemprop="name" content="微弱的光">
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<h2 class="post-title" itemprop="name headline">
<a href="/2024/06/17/vue%E4%B8%AD%E7%9A%84%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E9%92%A9%E5%AD%90%E5%87%BD%E6%95%B0/" class="post-title-link" itemprop="url">vue中的生命周期钩子函数</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2024-06-17 13:27:59 / 修改时间：13:32:14" itemprop="dateCreated datePublished" datetime="2024-06-17T13:27:59+08:00">2024-06-17</time>
</span>
<span class="post-meta-item" title="本文字数">
<span class="post-meta-item-icon">
<i class="far fa-file-word"></i>
</span>
<span>690</span>
</span>
<span class="post-meta-item" title="阅读时长">
<span class="post-meta-item-icon">
<i class="far fa-clock"></i>
</span>
<span>1 分钟</span>
</span>
</div>
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<div class="post-body" itemprop="articleBody">
<h1 id="vue中的生命周期钩子函数"><a href="#vue中的生命周期钩子函数" class="headerlink" title="vue中的生命周期钩子函数"></a>vue中的生命周期钩子函数</h1><p>在 Vue 3 中，生命周期函数总体上经历了一些改变，并引入了 Composition API，与 Vue 2.x 中的选项 API 有所不同。以下是 Vue 3 中常用的生命周期函数：</p>
<ol>
<li><p><strong>setup</strong>：组件创建阶段的入口，在组件实例创建之前执行，用于设置组件的初始状态、逻辑以及副作用操作等。</p>
</li>
<li><p><strong>beforeCreate</strong>：与 Vue 2.x 中的 <code>beforeCreate</code> 类似，在组件实例初始化之后，数据观测之前被调用。</p>
</li>
<li><p><strong>created</strong>：与 Vue 2.x 中的 <code>created</code> 类似，在实例创建完成后被调用，实例已完成数据观测、属性和方法运算。</p>
</li>
<li><p><strong>beforeMount</strong>：与 Vue 2.x 中的 <code>beforeMount</code> 类似，在挂载开始之前被调用，相关的 render 函数首次调用。</p>
</li>
<li><p><strong>mounted</strong>：与 Vue 2.x 中的 <code>mounted</code> 类似，在挂载结束后被调用，实例已挂载到 DOM 上。</p>
</li>
<li><p><strong>beforeUpdate</strong>：当数据更改导致虚拟 DOM 重新渲染之前调用。</p>
</li>
<li><p><strong>updated</strong>：当数据更改导致虚拟 DOM 重新渲染和打补丁后调用。</p>
</li>
<li><p><strong>beforeUnmount</strong>：在卸载组件之前调用。</p>
</li>
<li><p><strong>unmounted</strong>：在卸载组件后调用。</p>
</li>
<li><p><strong>errorCaptured</strong>：捕获组件子树中任何错误的处理器。</p>
</li>
</ol>
<p>除了上述生命周期函数外，Vue 3 还引入了 Composition API，开发者可以使用 <code>onMounted</code>、<code>onUpdated</code>、<code>onUnmounted</code> 等函数来实现类似生命周期钩子的功能。Composition API 提供了更灵活的方式来组织组件的逻辑。请注意，Vue 3 中的生命周期钩子函数与 Vue 2.x 中可能略有差异，主要是由于引入了 Composition API 的改变。</p>
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<meta itemprop="name" content="微弱的光">
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<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2024/06/17/%E4%BD%BF%E7%94%A8%E7%BA%BF%E6%80%A7%E6%B8%90%E5%8F%98%E5%AE%9E%E7%8E%B0%E6%B8%90%E5%8F%98%E8%83%8C%E6%99%AF/" class="post-title-link" itemprop="url">使用线性渐变实现渐变背景</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2024-06-17 09:57:06 / 修改时间：11:18:49" itemprop="dateCreated datePublished" datetime="2024-06-17T09:57:06+08:00">2024-06-17</time>
</span>
<span class="post-meta-item" title="本文字数">
<span class="post-meta-item-icon">
<i class="far fa-file-word"></i>
</span>
<span>482</span>
</span>
<span class="post-meta-item" title="阅读时长">
<span class="post-meta-item-icon">
<i class="far fa-clock"></i>
</span>
<span>1 分钟</span>
</span>
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<h1 id="使用线性渐变实现渐变背景"><a href="#使用线性渐变实现渐变背景" class="headerlink" title="使用线性渐变实现渐变背景"></a>使用线性渐变实现渐变背景</h1><figure class="highlight css"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="attribute">background-image</span>: <span class="built_in">linear-gradient</span>(<span class="number">270deg</span>, <span class="number">#f66</span>, <span class="number">#ff9f9f</span>);</span><br></pre></td></tr></table></figure>
<p>这段CSS代码是用于设置元素的背景图片，但是这里使用的不是传统的图像文件，而是通过线性渐变（linear gradient）来实现背景效果。让我们来解释一下这段代码的含义：</p>
<ol>
<li><p><strong><code>background-image:</code></strong> 这是CSS属性，用于设置元素的背景图片。</p>
</li>
<li><p><strong><code>linear-gradient(270deg, #f66, #ff9f9f);</code></strong> 这是具体的背景图片值，表示使用线性渐变（从一个颜色过渡到另一个颜色）来创建背景。</p>
</li>
</ol>
<ul>
<li><p><strong><code>270deg</code></strong> 表示指定线性渐变的方向为270度，即从底部到顶部的垂直方向。</p>
</li>
<li><p><strong><code>#f66</code></strong> 和 <strong><code>#ff9f9f</code></strong> 是渐变的起始色和结束色。第一个颜色 <code>#f66</code> 代表浅红色，第二个是 <code>#ff9f9f</code> 代表淡红色。在这种情况下，从底部到顶部的背景将逐渐从浅红色过渡到淡红色。</p>
</li>
</ul>
<p>所以，这段代码的意思是设置元素的背景为从底部到顶部的垂直线性渐变，颜色过渡从浅红色（<code>#f66</code>）到淡红色（<code>#ff9f9f</code>）。这样的效果会创建一个具有渐变色的背景，使元素看起来更加丰富和动态。</p>
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<h1 id="Flex布局与Grid布局"><a href="#Flex布局与Grid布局" class="headerlink" title="Flex布局与Grid布局"></a>Flex布局与Grid布局</h1><p>Grid布局和Flex布局都是在CSS中用于进行页面布局的工具，它们各有优势和适用场景。以下是它们的一些异同点以及优缺点：</p>
<p><strong>异同点：</strong></p>
<ol>
<li><p><strong>相同点：</strong></p>
<ul>
<li>两者都是现代CSS布局工具，用于实现响应式布局和页面排版。</li>
<li>都支持对网格和弹性盒子进行灵活布局。</li>
<li>都可以在容器内部的子元素之间创建空间布局。</li>
</ul>
</li>
<li><p><strong>不同点：</strong></p>
<ul>
<li><p><strong>Flex布局（弹性布局）：</strong></p>
<ul>
<li>适用于一维布局，例如在一条水平或垂直的轴线上布局元素。</li>
<li>适合于构建灵活的、水平或垂直居中的布局。</li>
<li>可以根据内容的大小来调整元素的尺寸。</li>
</ul>
</li>
<li><p><strong>Grid布局（网格布局）：</strong></p>
<ul>
<li>适用于二维布局，可以在交叉轴上对元素进行定位，创建复杂的网格布局。</li>
<li>适用于规划复杂的网格结构，如页面布局的整体设计。</li>
<li>可以控制行与列交叉点的位置，实现更精确的布局设计。</li>
</ul>
</li>
</ul>
</li>
</ol>
<p><strong>优缺点：</strong></p>
<ol>
<li><p><strong>Flex布局优点：</strong></p>
<ul>
<li>简单实用，适合搭建基本的布局和页面结构。</li>
<li>支持响应式布局，更容易实现移动端适配，适合移动端开发。</li>
<li>配合弹性盒子布局的属性丰富，可以快速实现元素的排列和对齐。</li>
</ul>
<p><strong>缺点：</strong></p>
<ul>
<li>适用于相对简单布局，复杂的网格结构可能实现起来比较困难。</li>
<li>不太适合搭建复杂的多列布局。</li>
</ul>
</li>
<li><p><strong>Grid布局优点：</strong></p>
<ul>
<li>可以实现更复杂的网格布局，可以精确控制元素的位置和大小。</li>
<li>适合搭建大型网站和复杂的设计布局。</li>
<li>支持分区和定位，可以创建更灵活的页面结构。</li>
</ul>
<p><strong>缺点：</strong></p>
<ul>
<li>学习成本相对较高，语法相对复杂，初学者可能需要一定时间适应。</li>
<li>在一维布局方面不如Flex布局灵活，并不适用于所有布局场景。</li>
</ul>
</li>
</ol>
<p><strong>结论：</strong> </p>
<ul>
<li>如果页面结构相对简单，主要涉及到一维布局的元素排列和对齐，Flex布局是一个不错的选择。</li>
<li>如果需要实现复杂的二维布局，例如创建大型网格结构，Grid布局更适合用来实现。</li>
<li>在实际项目中，可以根据具体需求和布局复杂度来选择合适的布局方法，有时候也可以结合使用两者来实现更灵活和多样化的布局效果。</li>
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<h1 id="文本的截断和显示控制"><a href="#文本的截断和显示控制" class="headerlink" title="文本的截断和显示控制"></a>文本的截断和显示控制</h1><p>下面三个属性通常用于在Web开发中对文本进行截断和显示控制，主要用于控制文本在容器中的显示方式。具体含义如下：</p>
<ol>
<li><p><code>display: -webkit-box;</code>：这个属性用于指定元素应该生成一个块级容器框。在这种布局模型中，元素是一个块级容器，可以在内部容纳其他元素。在这种情况下，通常需要与其他属性结合使用。</p>
</li>
<li><p><code>-webkit-line-clamp: 2;</code>：这个属性用于指定显示的行数限制。在文本溢出时，只显示指定行数的文本内容。上面的例子中，只显示不超过两行的文本内容。</p>
</li>
<li><p><code> -webkit-box-orient: vertical;</code>：这个属性用于指定盒子的排列方向。在这种情况下，盒子内的元素垂直排列。</p>
</li>
</ol>
<p>这些属性通常与前缀 <code>-webkit-</code> 一起使用，表示这些属性是Webkit浏览器专有的CSS扩展。这些属性主要用于控制元素的显示方式，特别是在限制文本显示行数和盒子内元素排列方向方面。</p>
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<h1 id="text-overflow的用法"><a href="#text-overflow的用法" class="headerlink" title="text-overflow的用法"></a>text-overflow的用法</h1><p><code>text-overflow</code>是CSS样式属性，用于控制当文本溢出容器时如何显示。</p>
<p>常见的取值有：</p>
<ul>
<li><code>clip</code>：默认值，表示将溢出的部分隐藏。</li>
<li><code>ellipsis</code>：表示将溢出的文本显示为省略号（…）。</li>
<li><code>inherit</code>：继承父元素的文本溢出样式。</li>
</ul>
<p>示例：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.text-ellipsis</span> {</span><br><span class="line"> <span class="attribute">white-space</span>: nowrap; <span class="comment">/* 不换行 */</span></span><br><span class="line"> <span class="attribute">overflow</span>: hidden; <span class="comment">/* 溢出隐藏 */</span></span><br><span class="line"> <span class="attribute">text-overflow</span>: ellipsis; <span class="comment">/* 超出部分以省略号显示 */</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>在上面的示例中，当文本内容超出容器的宽度时，将以省略号的形式显示。需要注意的是，通常需要配合<code>white-space: nowrap;</code>和<code>overflow: hidden;</code>这两个样式属性一起使用，来确保省略号的效果正常显示。</p>
<p><code>text-overflow</code>通常用于单行文本或者内联元素，对于多行文本或块级元素，更适合使用<code>-webkit-line-clamp</code>结合<code>-webkit-box</code>来实现类似的效果。</p>
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<h1 id="less中的-amp-符号"><a href="#less中的-amp-符号" class="headerlink" title="less中的&符号"></a>less中的&符号</h1><p>在 Less 预处理器中，<code>&</code> 符号用于引用当前选择器的父级。这在嵌套规则中非常有用，可以帮助生成更复杂的选择器，而不需要重复父选择器的名称。</p>
<h3 id="基本用法"><a href="#基本用法" class="headerlink" title="基本用法"></a>基本用法</h3><p>在 Less 中，<code>&</code> 符号代表父选择器，可以用来构建更复杂的选择器规则。例如：</p>
<figure class="highlight less"><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">color</span>: black;</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-pseudo">:hover</span> {</span><br><span class="line"> <span class="attribute">color</span>: blue;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-pseudo">::before</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">"Prefix"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>编译后的 CSS 如下：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">color</span>: black;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.container</span><span class="selector-pseudo">:hover</span> {</span><br><span class="line"> <span class="attribute">color</span>: blue;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.container</span><span class="selector-pseudo">::before</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">"Prefix"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="具体示例"><a href="#具体示例" class="headerlink" title="具体示例"></a>具体示例</h3><p>以下是一些常见的 <code>&</code> 符号用法示例：</p>
<h4 id="1-伪类和伪元素"><a href="#1-伪类和伪元素" class="headerlink" title="1. 伪类和伪元素"></a>1. 伪类和伪元素</h4><figure class="highlight less"><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.button</span> {</span><br><span class="line"> <span class="attribute">background-color</span>: green;</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-pseudo">:hover</span> {</span><br><span class="line"> <span class="attribute">background-color</span>: darkgreen;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-pseudo">::after</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">" (hover me)"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>编译后的 CSS：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.button</span> {</span><br><span class="line"> <span class="attribute">background-color</span>: green;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.button</span><span class="selector-pseudo">:hover</span> {</span><br><span class="line"> <span class="attribute">background-color</span>: darkgreen;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.button</span><span class="selector-pseudo">::after</span> {</span><br><span class="line"> <span class="attribute">content</span>: <span class="string">" (hover me)"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="2-子选择器"><a href="#2-子选择器" class="headerlink" title="2. 子选择器"></a>2. 子选择器</h4><figure class="highlight less"><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.nav</span> {</span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-tag">-item</span> {</span><br><span class="line"> <span class="attribute">color</span>: red;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>编译后的 CSS：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.nav-item</span> {</span><br><span class="line"> <span class="attribute">color</span>: red;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="3-父选择器引用"><a href="#3-父选择器引用" class="headerlink" title="3. 父选择器引用"></a>3. 父选择器引用</h4><figure class="highlight less"><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.list</span> {</span><br><span class="line"> <span class="selector-class">.list-item</span> {</span><br><span class="line"> <span class="attribute">color</span>: blue;</span><br><span class="line"> </span><br><span class="line"> <span class="selector-tag">&</span><span class="selector-class">.active</span> {</span><br><span class="line"> <span class="attribute">color</span>: darkblue;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>编译后的 CSS：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.list</span> <span class="selector-class">.list-item</span> {</span><br><span class="line"> <span class="attribute">color</span>: blue;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.list</span> <span class="selector-class">.list-item</span><span class="selector-class">.active</span> {</span><br><span class="line"> <span class="attribute">color</span>: darkblue;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="4-嵌套媒体查询"><a href="#4-嵌套媒体查询" class="headerlink" title="4. 嵌套媒体查询"></a>4. 嵌套媒体查询</h4><figure class="highlight less"><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">100%</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">@media</span> (<span class="attribute">min-width</span>: <span class="number">768px</span>) {</span><br><span class="line"> <span class="selector-tag">&</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">50%</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>编译后的 CSS：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">100%</span>;</span><br><span class="line">}</span><br><span class="line"><span class="keyword">@media</span> (<span class="attribute">min-width</span>: <span class="number">768px</span>) {</span><br><span class="line"> <span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">50%</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p><code>&</code> 符号在 Less 中非常强大，可以帮助你避免重复代码，并使样式表更具可读性和可维护性。通过合理使用 <code>&</code> 符号，可以轻松创建复杂的选择器规则，提升 CSS 编写的效率和灵活性。</p>
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<h1 id="Overflow的用法"><a href="#Overflow的用法" class="headerlink" title="Overflow的用法"></a>Overflow的用法</h1><p><code>overflow</code> 是 CSS 中的一个属性，用于控制元素内容在水平方向和垂直方向上的溢出行为。它决定了当内容溢出元素的尺寸时，是否显示滚动条、截断内容或其他处理方式。</p>
<h3 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h3><figure class="highlight css"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="attribute">overflow</span>: visible | hidden | scroll | auto;</span><br></pre></td></tr></table></figure>
<h3 id="属性值"><a href="#属性值" class="headerlink" title="属性值"></a>属性值</h3><ul>
<li><code>visible</code>：默认值。内容不会被剪裁，会呈现在元素框之外。</li>
<li><code>hidden</code>：溢出内容会被剪裁（隐藏），不会显示滚动条。</li>
<li><code>scroll</code>：无论内容是否溢出，都会显示滚动条。</li>
<li><code>auto</code>：如果内容溢出，浏览器会自动显示滚动条。</li>
</ul>
<h3 id="示例"><a href="#示例" class="headerlink" title="示例"></a>示例</h3><p>假设有一个包含大量文本的容器：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"container"</span>></span></span><br><span class="line"> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse varius enim in eros elementum tristique.</span><br><span class="line"><span class="tag"></<span class="name">div</span>></span></span><br></pre></td></tr></table></figure>
<p>CSS 代码如下：</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow</span>: auto; <span class="comment">/* 自动显示滚动条 */</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>在这个例子中：</p>
<ul>
<li>当容器的内容宽度或高度超过 200px 或 100px 时，浏览器会自动显示水平或垂直滚动条，以便用户可以滚动查看内容。</li>
</ul>
<h3 id="各属性值示例"><a href="#各属性值示例" class="headerlink" title="各属性值示例"></a>各属性值示例</h3><ol>
<li><code>visible</code>：</li>
</ol>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow</span>: visible;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>内容会溢出容器，不会显示滚动条。</p>
<ol start="2">
<li><code>hidden</code>：</li>
</ol>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow</span>: hidden;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>内容会被剪裁，溢出部分不可见，不会显示滚动条。</p>
<ol start="3">
<li><code>scroll</code>：</li>
</ol>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow</span>: scroll;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>无论内容是否溢出，都会显示滚动条。</p>
<ol start="4">
<li><code>auto</code>：</li>
</ol>
<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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow</span>: auto;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>当内容溢出时，浏览器会自动显示滚动条。</p>
<h3 id="组合使用-overflow-x-和-overflow-y"><a href="#组合使用-overflow-x-和-overflow-y" class="headerlink" title="组合使用 overflow-x 和 overflow-y"></a>组合使用 <code>overflow-x</code> 和 <code>overflow-y</code></h3><p>有时你可能需要分别控制水平方向和垂直方向的溢出行为，这时可以使用 <code>overflow-x</code> 和 <code>overflow-y</code> 属性。</p>
<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-class">.container</span> {</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">200px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid black;</span><br><span class="line"> <span class="attribute">overflow-x</span>: auto; <span class="comment">/* 水平方向自动显示滚动条 */</span></span><br><span class="line"> <span class="attribute">overflow-y</span>: hidden; <span class="comment">/* 垂直方向隐藏溢出内容 */</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="注意事项"><a href="#注意事项" class="headerlink" title="注意事项"></a>注意事项</h3><ul>
<li><code>overflow</code> 属性仅在元素具有限定的宽度和高度时起作用。</li>
<li><code>overflow</code> 属性常用于创建滚动区域，特别是在布局响应式设计中。</li>
</ul>
<p>通过合理使用 <code>overflow</code> 属性，可以更好地控制元素内容在水平方向和垂直方向上的显示方式，提升页面的可读性和用户体验。</p>
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<h1 id="Axiso库"><a href="#Axiso库" class="headerlink" title="Axiso库"></a>Axiso库</h1><p><strong>官方介绍：</strong></p>