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2018-05-11-horizontalVerticalCenter.html
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<h1 id="水平垂直居中"><a href="#水平垂直居中" class="headerlink" title="水平垂直居中"></a>水平垂直居中</h1><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">div</span> <span class="attr">class</span>=<span class="string">"box1"</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">"box2"</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">"box3"</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">"box4"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</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 class="attr">class</span>=<span class="string">"box5"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"content"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"inner"</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">div</span>></span></span><br></pre></td></tr></table></figure>
<p>实现div水平垂直居中的几个方案<br>一、margin:auto实现绝对定位元素的居中，兼容性：ie7之前的版本不适用</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><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">.box1</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">200px</span>;</span><br><span class="line"> <span class="attribute">background</span>: green;</span><br><span class="line"> <span class="attribute">position</span>: absolute;</span><br><span class="line"> <span class="attribute">left</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">right</span>: <span class="number">0</span>;</span><br><span class="line"> <span class="attribute">bottom</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">top</span>: <span class="number">0</span>;</span><br><span class="line"> <span class="attribute">margin</span>: auto;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>二、margin负间距 </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><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.box2</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">200px</span>;</span><br><span class="line"> <span class="attribute">background</span>:red;</span><br><span class="line"> <span class="attribute">position</span>: absolute;</span><br><span class="line"> <span class="attribute">left</span>:<span class="number">50%</span>;</span><br><span class="line"> <span class="attribute">top</span>:<span class="number">50%</span>;</span><br><span class="line"> <span class="attribute">margin-left</span>: -<span class="number">100px</span>;</span><br><span class="line"> <span class="attribute">margin-top</span>: -<span class="number">100px</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>三、transforms 变形 兼容性：ie8不支持 </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">.box3</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">200px</span>;</span><br><span class="line"> <span class="attribute">background</span>:blue;</span><br><span class="line"> <span class="attribute">position</span>: absolute;</span><br><span class="line"> <span class="attribute">left</span>:<span class="number">50%</span>; <span class="comment">/*定位父级的50%*/</span></span><br><span class="line"> <span class="attribute">top</span>:<span class="number">50%</span>;</span><br><span class="line"> <span class="attribute">transform</span>:<span class="built_in">translate</span>(-50%,-50%);<span class="comment">/*自己的50%*/</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>四、css不定宽水平垂直居中（高要设置） </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><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.box4</span>{ </span><br><span class="line"> <span class="attribute">display</span>: flex;</span><br><span class="line"> <span class="attribute">justify-content</span>: center;</span><br><span class="line"> <span class="attribute">align-items</span>: center;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.box4</span>><span class="selector-tag">div</span>{</span><br><span class="line"> <span class="attribute">background</span>:<span class="number">#ff9</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">200px</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>五、table-cell布局<br>table-cell相当与表格的td，td为行内元素，无法设置宽和高，所以嵌套一层，嵌套一层必须设置display: inline-block;td的背景覆盖了橘黄色，不推荐使用</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><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></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.box5</span>{</span><br><span class="line"> <span class="attribute">background-color</span>: <span class="number">#FF8C00</span>;<span class="comment">/*橘黄色*/</span></span><br><span class="line"> <span class="attribute">width</span>: <span class="number">300px</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">300px</span>;</span><br><span class="line"> <span class="attribute">display</span>: table;</span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.content</span>{</span><br><span class="line"> <span class="attribute">background-color</span>: <span class="number">#F00</span>;<span class="comment">/*红色*/</span></span><br><span class="line"> <span class="attribute">display</span>: table-cell;</span><br><span class="line"> <span class="attribute">vertical-align</span>: middle;<span class="comment">/*使子元素垂直居中*/</span></span><br><span class="line"> <span class="attribute">text-align</span>: center;<span class="comment">/*使子元素水平居中*/</span></span><br><span class="line">}</span><br><span class="line"><span class="selector-class">.inner</span>{</span><br><span class="line"> <span class="attribute">background-color</span>: <span class="number">#000</span>;<span class="comment">/*黑色*/</span></span><br><span class="line"> <span class="attribute">display</span>: inline-block;</span><br><span class="line"> <span class="attribute">width</span>: <span class="number">20%</span>;</span><br><span class="line"> <span class="attribute">height</span>: <span class="number">20%</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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