transition-timing-function

transition-timing-function: linear | ease | ease-in | ease-out | ease-in-out | cubic-bezier(<number>, <number>, <number>, <number>)[ ,linear | ease | ease-in | ease-out | ease-in-out | cubic-bezier(<number>, <number>, <number>, <number>) ]* ;设置动画执行的方式（缓动效果）。