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FLEX 弹性布局 解决的问题 块元素的垂直居中, flex 可以轻松解决元素大小在容器中的自动伸缩,以适应容器的变化,特别适合移动端布局提醒:设为 Flex 布局后,子元素的 float、clear 和 vertical-align 属性将失效。...