如何理解zindexHow-to-understand-the-property-of-zindex-in-css

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CSS 中的 z -index 属性管制重叠元素的垂直叠加程序，默认元素的 z -index 为 0，咱们能够批改 z -index 来管制元素的图层地位，而且 z -index 只能影响设置了 position 值的元素。

咱们能够把视图上的元素认为是一摞书的层叠，而人眼是仰视的视角，设置 z -index 的地位，就如同设置某一本书在这摞书中的地位。

顶部: 最靠近观察者
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0 层默认层
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底层: 间隔观察者最远

How to understand the property of `z-index` in css?

The z-index property in CSS controls the vertical stacking order of overlapping elements. The z-index of the default element is 0. We can modify the value of z-index to control the layer position of the element, and the property of z-index can only affect the element whose the value of position is set.

We can think of the elements on the view as a stack of books, and the human eye is the perspective of looking down. Setting the z-index position is like setting the position of a book in the stack of books.