Easing Function
A mathematical function that determines the distribution of an animation's speed along its timeline. Common types include linear, ease-out, ease-in, ease-in-out, and custom cubic-bezier curves.
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The easing function determines how speed is distributed along the animation's timeline; ease-out means fast first and slow later, suited to elements entering the viewport; ease-in is slow first and fast later, suited to elements leaving; ease-in-out decelerates at both ends, suited to position changes.
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Robert Penner在2001年提出的经典缓动函数集（ease-in、ease-out、ease-in-out等）至今仍是行业标准
85%UnverifiedThe easing function determines how speed is distributed along the animation's timeline; ease-out means fast first and slow later, suited to elements entering the viewport; ease-in is slow first and fast later, suited to elements leaving; ease-in-out decelerates at both ends, suited to position changes.
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