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<title>利用定位来显示垂直局中的图片</title>

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<h1>固定高宽的容器中，图片垂直局中。</h1>

<p>绿色容器是span，目的是使自己的左上角与容器中心点对齐。红色是具体图片，再次设置负值使自己的中心点和父容器的中心点重合，最终达到垂直局中的目的。</p>

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