animation

http://www.w3cplus.com/content/css3-animation

@-webkit-keyframes 'test' {

  0% {}

  50% {}

  100% {}

}

-webkit-animation:'test' 2s linear 1s infinite alternate

-webkit-animation:name duration timing-function delay iteration-count direction

animation-iteration-count:次数/infinite(无限次)

animation-direction:normal/alternate(偶数次向前，奇数次反方向)

animation-fill-mode:forwards(动画结束时的状态)

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animation-play-state:running(运动)、paused(暂停)   =>越少使用