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CSS 中重要的层叠概念

 5 years ago
source link: https://juejin.im/post/5ba4efe36fb9a05cf52ac192
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最近在项目的过程中遇到了一个问题，menu-bar希望始终显示在最上面，而在之后的元素都显示在它之下，当时设置了 z-index 也没有效果，不知道什么原因，因此找了一下css有关层叠方面的资料，解决了这个问题，这里记录一下~ 屏幕是一个二维平面，然而HTML

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