爲什麼給元素添加了z-index卻沒有效果

原創 mini_1251861209 2020-06-30 23:52

要想給元素設置z-index樣式，必須先讓它變成定位元素，即要設置position屬性，值包括relative，absolute，fixed

如果不想給本元素設置，那麼可以給他的父元素設置position屬性，效果是一樣的

 

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