用 CSS 实现元素垂直居中,有哪些好的办法?
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1.不<span style="color: black;">晓得</span>自己高度和父容器高度的<span style="color: black;">状况</span>下, 利用绝对定位只<span style="color: black;">必须</span>以下三行:</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">parentElement</span><span style="color: black;">{</span>
<span style="color: black;">position</span><span style="color: black;">:</span><span style="color: black;">relative</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: black;">childElement</span><span style="color: black;">{</span>
<span style="color: black;">position</span><span style="color: black;">:</span> <span style="color: black;">absolute</span><span style="color: black;">;</span>
<span style="color: black;">top</span><span style="color: black;">:</span> <span style="color: black;">50</span><span style="color: black;">%</span><span style="color: black;">;</span>
<span style="color: black;">transform</span><span style="color: black;">:</span> <span style="color: black;">translateY</span><span style="color: black;">(</span><span style="color: black;">-50</span><span style="color: black;">%</span><span style="color: black;">);</span>
<span style="color: black;">}</span>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.若父容器下<span style="color: black;">仅有</span>一个元素,且父元素设置了高度,则只<span style="color: black;">必须</span><span style="color: black;">运用</span>相对定位<span style="color: black;">就可</span></p>
<div style="color: black; text-align: left; margin-bottom: 10px;"> <span style="color: black;">parentElement</span><span style="color: black;">{</span>
<span style="color: black;">height</span><span style="color: black;">:</span><span style="color: black;">xxx</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: black;">.</span><span style="color: black;">childElement</span> <span style="color: black;">{</span>
<span style="color: black;">position</span><span style="color: black;">:</span> <span style="color: black;">relative</span><span style="color: black;">;</span>
<span style="color: black;">top</span><span style="color: black;">:</span> <span style="color: black;">50</span><span style="color: black;">%</span><span style="color: black;">;</span>
<span style="color: black;">transform</span><span style="color: black;">:</span> <span style="color: black;">translateY</span><span style="color: black;">(</span><span style="color: black;">-50</span><span style="color: black;">%</span><span style="color: black;">);</span>
<span style="color: black;">}</span>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">demo: </p><a style="color: black;">Edit fiddle - JSFiddle</a>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">Flex 布局:</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">不<span style="color: black;">思虑</span>兼容老式浏览器的话,用Flex布局简单直观一劳永逸:</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">parentElement</span><span style="color: black;">{</span>
</div>
</span></div>
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