CSS无法顺利进出动画

Question

div无法顺利进出脉冲动画？

https://jsfiddle.net/86gxLy2a/

CSS

div {
  width: 20px;
  height: 20px;
  border-radius: 10px;
  border: 2px solid black;
  transform: scale(.5);
  transition: all .3s ease-in-out;
}

div:hover {
  animation: pulse 1s infinite;
}

@keyframes pulse {
  from, to {
    transform: scale(1);
  }
  50% {
    transform: scale(.8);
  }
}

Answer 1

您可以延迟动画并在悬停时放大

更新：现在也可以在Chrome中顺利运行。现在唯一的问题是，脉冲动画将在页面加载时运行。

div {
  width: 20px;
  height: 20px;
  border-radius: 10px;
  border: 2px solid black;
  -webkit-transform: scale(.5);
  -moz-transform: scale(.5);
  -ms-transform: scale(.5);
  -o-transform: scale(.5);
  transform: scale(.5);
  transition: all .3s ease-in-out;
  animation: unpulse .3s;
}

div:hover {
  transform: scale(1);
  animation: pulse 1s infinite;
  animation-delay: .3s;
}

@keyframes pulse {
  to {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
  }
  50% {
    -webkit-transform: scale(.8);
    -moz-transform: scale(.8);
    -ms-transform: scale(.8);
    -o-transform: scale(.8);
    transform: scale(.8);
  }
}

@keyframes unpulse {
  0% {
    -webkit-transform: scale(.9);
    -moz-transform: scale(.9);
    -ms-transform: scale(.9);
    -o-transform: scale(.9);
    transform: scale(.9);
  }
  100% {
    -webkit-transform: scale(.5);
    -moz-transform: scale(.5);
    -ms-transform: scale(.5);
    -o-transform: scale(.5);
    transform: scale(.5);
  }
}

<div>  
</div>

Answer 2

你的div的比例需要等于动画的初始比例才能显得平滑

变换：scale（1）; - DIV

变换：scale（1）; - 动画第一个关键帧

＆＃13;

＆＃13;

div {
  width: 20px;
  height: 20px;
  border-radius: 10px;
  border: 2px solid black;

  transform: scale(1);
  transition: all .3s ease-in-out;
}

div:hover {
  animation: pulse 1s infinite;
}

@keyframes pulse {
  from, to {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
  }
  50% {
    -webkit-transform: scale(.8);
    -moz-transform: scale(.8);
    -ms-transform: scale(.8);
    -o-transform: scale(.8);
    transform: scale(.8);
  }
}

＆＃13;

<div>  
</div>

＆＃13;

＆＃13;

＆＃13;