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fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">什么是BFC？它的作用是什么以及怎么创建BFC区域</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-08-22T13:23:40.000Z" title="发表于 2021-08-22 21:23:40">2021-08-22</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-08-05T08:52:22.231Z" title="更新于 2022-08-05 16:52:22">2022-08-05</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF/">前端</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF/%E9%9D%A2%E8%AF%95%E9%A2%98/">面试题</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">842</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>2分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="什么是BFC？它的作用是什么以及怎么创建BFC区域"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="啥是BFC"><a href="#啥是BFC" class="headerlink" title="啥是BFC"></a>啥是BFC</h2><h2 id="看不明白的定义："><a href="#看不明白的定义：" class="headerlink" title="看不明白的定义："></a><strong>看不明白的定义：</strong></h2><p>BFC (Block formatting context)直译为”块级格式化上下文”。它是一个独立的渲染区域，只有Block-level box参与， 它规定了内部的Block-level Box如何布局，并且与这个区域外部毫不相干。</p>
<p><strong>官方文档到中是这么介绍的</strong>：</p>
<blockquote>
<p><code>一个BFC区域包含创建该上下文元素的所有子元素，但是不包括创建了新的BFC的子元素的内部元素，BFC是一块块独立的渲染区域，可以将BFC看成是元素的一种属性，拥有了这种属性的元素就会使他的子元素与世隔绝，不会影响到外部其他元素。</code></p>
</blockquote>
<h2 id="代码理解"><a href="#代码理解" class="headerlink" title="代码理解"></a>代码理解</h2><p>还不是很清楚什么意思？上代码！</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><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"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"father"</span> <span class="attr">id</span>=<span class="string">"father"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"1"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"1"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"1"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"1"</span> <span class="attr">id</span>=<span class="string">"son"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"2"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"2"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"2"</span>></span><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">body</span>></span></span><br></pre></td></tr></table></figure>
<p>假设father和son盒子都是BFC区域<br>id=”father”这个BFC区域包含了所有 class=”1”的盒子但<strong>不包含</strong>class=”2”的盒子<br>id=”son”的这个BFC区域则包含了所以class=”2”的盒子。<br>那么总结下来可以得到如下结论：<br>1.每一个BFC区域只包括它的子元素，并不包括子元素的子元素。<br>2.每个BFC区域都是独立隔绝开来的，互相不会受到影响。</p>
<h2 id="怎么创建BFC？"><a href="#怎么创建BFC？" class="headerlink" title="怎么创建BFC？"></a>怎么创建BFC？</h2><ol>
<li>根元素</li>
<li>float属性不为none</li>
<li>overflow不为visible</li>
<li>position为absolute或fixed</li>
<li>display为inline-block， table-cell， table-caption， flex， inline-flex</li>
</ol>
<h2 id="BFC的作用"><a href="#BFC的作用" class="headerlink" title="BFC的作用"></a>BFC的作用</h2><p>既然知道了BFC是咋回事，也知道了怎么创建BFC，那么它的作用是什么呢？</p>
<h3 id="清除浮动"><a href="#清除浮动" class="headerlink" title="清除浮动"></a>清除浮动</h3><p>浮动会导致父元素高度塌陷，相信刚开始学html的同学们都记得overflow: hidden可以清除浮动，但是听说BFC之前却不清楚原理，经过上边的解释后就知道了是因为在BFC区域内子元素是不会影响到外部元素的。</p>
<h3 id="解决外边距塌陷"><a href="#解决外边距塌陷" class="headerlink" title="解决外边距塌陷"></a>解决外边距塌陷</h3><p>前端布局离不开margin，那么肯定会遇到外边距塌陷的问题</p>
<p><img src="https://s1.ax1x.com/2022/07/22/jOrC59.png" alt="外边距塌陷"></p>
<p>如图，我们给两个盒子分别设置了100px的外边距，两个盒子之间的外边距应该有200px，但是现在只有100px，那么根据刚开始我们的理解，只要给这两个盒子都加一个父盒子并设置为BFC区域就应该能解决这个问题，马上动手验证</p>
<p><img src="https://s1.ax1x.com/2022/07/22/jOrNVg.png" alt="解决外边距塌陷"></p>
<p>可以看到果然是正确的解决了外边距塌陷的问题。</p>
<h3 id="解决包含塌陷"><a href="#解决包含塌陷" class="headerlink" title="解决包含塌陷"></a>解决包含塌陷</h3><p><img src="https://s1.ax1x.com/2022/07/22/jOsdeO.png" alt="包含塌陷"></p>
<p>从上图可以看出我本来是给子盒子margin-top让他离父盒子顶部30px，但是却导致子盒子带着父盒子整体往下跑了30px，我们想要的效果却没有出来，要实现我们想要的效果有两个办法，一就是用padding，二就是把父盒子变成BFC区域，我们当然是选择第二种</p>
<p><img src="https://s1.ax1x.com/2022/07/22/jOs7pn.png" alt="解决包含塌陷"><br>完美解决！</p>
<h2 id="使用场景"><a href="#使用场景" class="headerlink" title="使用场景"></a>使用场景</h2><blockquote>
<p>解决塌陷问题，清除浮动，右边固定左边自适应。</p>
</blockquote>
<h3 id="暂时完结，后续再补充"><a href="#暂时完结，后续再补充" class="headerlink" title="暂时完结，后续再补充"></a>暂时完结，后续再补充</h3></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://lhx.zzux.com">Pride_Lee</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://lhx.zzux.com/fe-bfc.html">https://lhx.zzux.com/fe-bfc.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://lhx.zzux.com" target="_blank">小李の博客</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/%E9%9D%A2%E8%AF%95%E9%A2%98/">面试题</a><a class="post-meta__tags" 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class="toc-number">2.</span> <span class="toc-text">看不明白的定义：</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%A3%E7%A0%81%E7%90%86%E8%A7%A3"><span class="toc-number">3.</span> <span class="toc-text">代码理解</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%80%8E%E4%B9%88%E5%88%9B%E5%BB%BABFC%EF%BC%9F"><span class="toc-number">4.</span> <span class="toc-text">怎么创建BFC？</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#BFC%E7%9A%84%E4%BD%9C%E7%94%A8"><span class="toc-number">5.</span> <span class="toc-text">BFC的作用</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%B8%85%E9%99%A4%E6%B5%AE%E5%8A%A8"><span class="toc-number">5.1.</span> <span class="toc-text">清除浮动</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A7%A3%E5%86%B3%E5%A4%96%E8%BE%B9%E8%B7%9D%E5%A1%8C%E9%99%B7"><span class="toc-number">5.2.</span> <span 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