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in Technique[技术] by (71.8m points)

css高度上的过渡动画为什么不生效

li{
    .subnav{
        display: flex;
        flex-direction: column;
        transition:height 2s;//这个高度什么不生效
        padding: 10px 0;
        height: 0;
        overflow: hidden;
    }
}

#navmenu li:hover .subnav{
    height: auto;
}

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1 Answer

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by (71.8m points)

因为heigth:auto 不是具体值,无法触发过渡。
transition 必须满足是具体值,比如 opacity:0->opacity:1
可以将height:automax-height:xxx代替


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