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class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style><header id="header" class="header" itemscope itemtype="//schema.org/WPHeader"><div class="header-inner"><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">Moorez</span><span class="logo-line-after"><i></i></span></a></div><p class="site-subtitle"></p></div><div class="site-nav-toggle"><button><span class="btn-bar"></span><span class="btn-bar"></span><span class="btn-bar"></span></button></div><nav class="site-nav"><ul id="menu" class="menu"><li class="menu-item menu-item-home"><a href="/" 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class="popup-btn-close">close</span></div></div></nav></div></header><main id="main" class="main"><div class="main-inner"><div class="content-wrap"><div id="content" class="content"><div id="posts" class="posts-expand"><article class="post post-type-normal" itemscope itemtype="http://schema.org/Article"><link itemprop="mainEntityOfPage" href="http://www.shenzekun.cn/浮动.html"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="name" content="shenzekun"><meta itemprop="description" content=""><meta itemprop="image" content="https://blog-1257878287.cos.ap-chengdu.myqcloud.com/avatar1.jpg"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Moorez"></span><header class="post-header"><h1 class="post-title" itemprop="name headline">浮动</h1><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 itemprop="dateCreated" datetime="2017-07-01T16:06:44+08:00" content="2017-07-01">2017-07-01</time></span> <span class="post-category"> | <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="https://schema.org/Thing"><a href="/categories/前端/" itemprop="url" rel="index"><span itemprop="name">前端</span></a></span></span> <span id="/浮动.html" class="leancloud_visitors" data-flag-title="浮动"> | <span class="post-meta-item-icon"><i class="fa fa-eye"></i></span> <span class="post-meta-item-text">热度</span><span class="leancloud-visitors-count"></span> <span>℃</span></span><div class="post-wordcount"><span class="post-meta-divider">|</span><span class="post-meta-item-icon"><i class="fa fa-file-word-o"></i></span> <span class="post-meta-item-text">字数统计</span> <span title="字数统计">880 字</span> <span class="post-meta-divider">|</span><span class="post-meta-item-icon"><i class="fa fa-clock-o"></i></span> <span class="post-meta-item-text">阅读时长</span> <span title="阅读时长">4 分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><hr><blockquote><p>最近在学浮动的知识，下面总结了一些浮动的一些特征</p></blockquote><a id="more"></a><p><strong>1. 块级元素浮动将并排显示，不再独占一行</strong></p><p>示例代码：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="meta"><!DOCTYPE html></span></div><div class="line"><span class="tag"><<span class="name">html</span> <span class="attr">lang</span>=<span class="string">"en"</span>></span></div><div class="line"><span class="tag"><<span class="name">head</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span> <span class="attr">content</span>=<span class="string">"width=device-width, initial-scale=1.0"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"X-UA-Compatible"</span> <span class="attr">content</span>=<span class="string">"ie=edge"</span>></span></div><div class="line"> <span class="tag"><<span class="name">title</span>></span>Document<span class="tag"></<span class="name">title</span>></span></div><div class="line"> <span class="tag"><<span class="name">style</span>></span><span class="css"></span></div><div class="line"> <span class="selector-class">.box2</span>{</div><div class="line"> <span class="attribute">width</span>: <span class="number">100px</span>;</div><div class="line"> <span class="attribute">height</span>: <span class="number">100px</span>;</div><div class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid <span class="number">#ccc</span>;</div><div class="line"> <span class="attribute">background-color</span>: skyblue;</div><div class="line"> }</div><div class="line"> <span class="tag"></<span class="name">style</span>></span></div><div class="line"><span class="tag"></<span class="name">head</span>></span></div><div class="line"><span class="tag"><<span class="name">body</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"box2"</span>></span><span class="tag"></<span class="name">div</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"box2"</span>></span><span class="tag"></<span class="name">div</span>></span></div><div class="line"><span class="tag"></<span class="name">body</span>></span></div><div class="line"><span class="tag"></<span class="name">html</span>></span></div></pre></td></tr></table></figure><p>效果：</p><p><img src="https://ws4.sinaimg.cn/large/006tKfTcly1fgtxa48pcyj306m0cowea.jpg" alt=""></p><p>修改：</p><figure class="highlight"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><style></div><div class="line"> .box2{</div><div class="line"> width: 100px;</div><div class="line"> height: 100px;</div><div class="line"> border: 1px solid #ccc;</div><div class="line"> background-color: skyblue;</div><div class="line"> float: left;/*新增*/</div><div class="line"> }</div><div class="line"></style></div></pre></td></tr></table></figure><p>修改效果：</p><p><img src="https://ws1.sinaimg.cn/large/006tKfTcly1fgtxbxfi9hj30c007gq2q.jpg" alt=""></p><p><strong>2. 内联样式浮动就可以设置宽高，不仅能够支持margin-left(right)，而且也支持margin-top(bottom)</strong></p><p>示例代码：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div></pre></td><td class="code"><pre><div class="line"><span class="meta"><!DOCTYPE html></span></div><div class="line"><span class="tag"><<span class="name">html</span> <span class="attr">lang</span>=<span class="string">"en"</span>></span></div><div class="line"><span class="tag"><<span class="name">head</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span> <span class="attr">content</span>=<span class="string">"width=device-width, initial-scale=1.0"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"X-UA-Compatible"</span> <span class="attr">content</span>=<span class="string">"ie=edge"</span>></span></div><div class="line"> <span class="tag"><<span class="name">title</span>></span>Document<span class="tag"></<span class="name">title</span>></span></div><div class="line"> <span class="tag"><<span class="name">style</span>></span><span class="css"></span></div><div class="line"> *{</div><div class="line"> <span class="attribute">margin</span>: <span class="number">0</span>;</div><div class="line"> <span class="attribute">padding</span>: <span class="number">0</span>;</div><div class="line"> }</div><div class="line"> <span class="selector-class">.box2</span>{</div><div class="line"> <span class="attribute">width</span>: <span class="number">20px</span>;<span class="comment">/*无效*/</span></div><div class="line"> <span class="attribute">height</span>: <span class="number">70px</span>;<span class="comment">/*无效*/</span></div><div class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid <span class="number">#ccc</span>;</div><div class="line"> <span class="attribute">margin-top</span>: <span class="number">20px</span>;<span class="comment">/*无效*/</span></div><div class="line"> <span class="attribute">padding</span>: <span class="number">100px</span> <span class="number">30px</span>;</div><div class="line"> <span class="attribute">background-color</span>: skyblue;</div><div class="line"> }</div><div class="line"> <span class="tag"></<span class="name">style</span>></span></div><div class="line"><span class="tag"></<span class="name">head</span>></span></div><div class="line"><span class="tag"><<span class="name">body</span>></span></div><div class="line"> <span class="tag"><<span class="name">span</span> <span class="attr">class</span>=<span class="string">"box2"</span>></span><span class="tag"></<span class="name">span</span>></span></div><div class="line"> <span class="tag"><<span class="name">span</span> <span class="attr">class</span>=<span class="string">"box2"</span>></span><span class="tag"></<span class="name">span</span>></span></div><div class="line"><span class="tag"></<span class="name">body</span>></span></div><div class="line"><span class="tag"></<span class="name">html</span>></span></div></pre></td></tr></table></figure><p>效果：</p><p><img src="https://ws3.sinaimg.cn/large/006tKfTcly1fgtyjzeb3dj307206w0si.jpg" alt=""></p><p>修改：</p><figure class="highlight"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line"><style></div><div class="line"> *{</div><div class="line"> margin: 0;</div><div class="line"> padding: 0;</div><div class="line"> }</div><div class="line"> .box2{</div><div class="line"> width: 20px;/*生效*/</div><div class="line"> height: 70px;/*生效*/</div><div class="line"> border: 1px solid #ccc;</div><div class="line"> margin-top: 20px;/*生效*/</div><div class="line"> padding: 100px 30px;</div><div class="line"> background-color: skyblue;</div><div class="line"> float: left;/*新增*/</div><div class="line"> }</div><div class="line"></style></div></pre></td></tr></table></figure><p>修改效果：</p><p><img src="https://ws4.sinaimg.cn/large/006tKfTcly1fgtyq0mmujj30920gk0sk.jpg" alt=""></p><p><strong>3. 浮动元素脱离正常的文档流,普通元素会占据浮动元素的位置</strong></p><p><img src="https://ws3.sinaimg.cn/large/006tKfTcly1fgu19u1pbaj31240bwaai.jpg" alt=""></p><p>从上图可以看出，默认三个设置了宽高的<code>block</code>元素，本来会格子独占一行；如果框1设置了向左/向右浮动，他会忽略框2和框3，直到碰到父元素；同时也存在盖住普通元素的风险。</p><p><strong>4. 浮动会导致父元素高度坍塌</strong></p><p>示例代码：</p><figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="meta"><!DOCTYPE html></span></div><div class="line"><span class="tag"><<span class="name">html</span> <span class="attr">lang</span>=<span class="string">"en"</span>></span></div><div class="line"><span class="tag"><<span class="name">head</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span> <span class="attr">content</span>=<span class="string">"width=device-width, initial-scale=1.0"</span>></span></div><div class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"X-UA-Compatible"</span> <span class="attr">content</span>=<span class="string">"ie=edge"</span>></span></div><div class="line"> <span class="tag"><<span class="name">title</span>></span>Document<span class="tag"></<span class="name">title</span>></span></div><div class="line"><span class="tag"></<span class="name">head</span>></span></div><div class="line"><span class="tag"><<span class="name">body</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">style</span>=<span class="string">"border: solid 5px #0e0; width:300px;"</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">style</span>=<span class="string">"height: 100px; width: 100px; background-color: Red; float:left;"</span>></span></div><div class="line"> <span class="tag"></<span class="name">div</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">style</span>=<span class="string">"height: 100px; width: 100px; background-color: Green; float:left;"</span>></span></div><div class="line"> <span class="tag"></<span class="name">div</span>></span></div><div class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">style</span>=<span class="string">"height: 100px; width: 100px; background-color: Yellow; float:left;"</span>></span></div><div class="line"> <span class="tag"></<span class="name">div</span>></span></div><div class="line"> <span class="tag"></<span class="name">div</span>></span></div><div class="line"><span class="tag"></<span class="name">body</span>></span></div><div class="line"><span class="tag"></<span class="name">html</span>></span></div></pre></td></tr></table></figure><p>效果：</p><p><img src="https://ws3.sinaimg.cn/large/006tKfTcly1fgu1fgr312j30hm07et8k.jpg" alt=""></p><p>如上图所示，浮动元素脱离了文档流，并不占据文档流的位置，自然父元素也就不能被撑开，所以没了高度，导致父元素高度坍塌。</p><blockquote><p>浮动元素对父元素的影响</p></blockquote><p>对父容器 若子元素都是浮动元素，则无法撑开父元素高度，父元素失去高度。</p><blockquote><p>浮动元素其他浮动元素的影响</p></blockquote><p>对其他浮动元素，如果包含块太窄，无法完全水平容纳浮动元素，那么其他浮动元素就会向下移动，直到有足够空间。如果浮动元素高度不同，那么向下移动时可能会被卡住。</p><p>示例代码1（块太窄，向下移动）：</p><figure class="highlight applescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><<span class="keyword">div</span> style=<span class="string">"border: solid 5px #0e0; width:250px;"</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 100px; width: 100px; background-color: Red; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 100px; width: 100px; background-color: Green; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 100px; width: 100px; background-color: Yellow; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"></<span class="keyword">div</span>></div></pre></td></tr></table></figure><p>效果：</p><p><img src="https://ws3.sinaimg.cn/large/006tKfTcly1fgu24kxrizj30eu0ccq2t.jpg" alt=""></p><p>示例代码2（卡住）:</p><figure class="highlight applescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><<span class="keyword">div</span> style=<span class="string">"border: solid 5px #0e0; width:250px;"</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 120px; width: 100px; background-color: Red; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 100px; width: 100px; background-color: Green; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"> <<span class="keyword">div</span> style=<span class="string">"height: 100px; width: 100px; background-color: Yellow; float:left;"</span>></div><div class="line"> </<span class="keyword">div</span>></div><div class="line"></<span class="keyword">div</span>></div></pre></td></tr></table></figure><p>效果：</p><p><img src="https://ws4.sinaimg.cn/large/006tKfTcly1fgu26lbnj9j30eq0cca9x.jpg" alt=""></p><blockquote><p>浮动元素对普通元素的影响</p></blockquote><p>普通元素会表现得当作浮动元素不存在一样，浮动元素可以覆盖普通元素，如果宽高合适，普通元素可以占据浮动元素原来的位置</p><blockquote><p>对文字的影响</p></blockquote><p>文字(既inline-level)级的元素会环绕浮动元素，表现的像是察觉到浮动元素一样。</p></div><div><div><div style="text-align:center;color:#ccc;font-size:14px">-------------本文结束<i class="fa fa-paw"></i>感谢您的阅读-------------</div></div></div><div><div class="my_post_copyright"><script src="//cdn.bootcss.com/clipboard.js/1.5.10/clipboard.min.js"></script><script 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