CSS平滑弹跳动画 [英] CSS smooth bounce animation

问题描述

我需要使用纯CSS实现无限弹跳效果，因此我引用了此网站并最终做了此.

I needed to implement infinite bounce effect using pure CSS, so I referred this site and ended up doing this.

.animated {
  -webkit-animation-duration: 2.5s;
  animation-duration: 2.5s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  -webkit-animation-iteration-count: infinite;
} 

@-webkit-keyframes bounce {
  0%, 20%, 40%, 60%, 80%, 100% {-webkit-transform: translateY(0);}
  50% {-webkit-transform: translateY(-5px);}
} 

@keyframes bounce { 
  0%, 20%, 40%, 60%, 80%, 100% {transform: translateY(0);}
  50% {transform: translateY(-5px);}
} 

.bounce { 
  -webkit-animation-name: bounce;
  animation-name: bounce;
}

#animated-example {
    width: 20px;
    height: 20px;
    background-color: red;
    position: relative;
    top: 100px;
    left: 100px;
    border-radius: 50%;
}

hr {
    position: relative;
    top: 92px;
    left: -300px;
    width: 200px;
}

<div id="animated-example" class="animated bounce"></div>
<hr>

现在，我唯一的问题是弹跳元素需要更长的休息时间才能再次弹跳.像使用 jQuery.animate 所获得的弹跳效果一样，如何使其平滑弹跳?

Now, my only problem is the bouncing element takes a longer rest before it starts bouncing again. How can I make it bounce smoothly just like the bounce effect we get by using jQuery.animate?

推荐答案

之间的长时间休息归因于关键帧设置.您当前的关键帧规则意味着实际的反弹仅发生在动画持续时间的40％-60％之间(即动画的1s-1.5s标记之间).删除这些规则，甚至减少animation-duration以适合您的需求.

The long rest in between is due to your keyframe settings. Your current keyframe rules mean that the actual bounce happens only between 40% - 60% of the animation duration (that is, between 1s - 1.5s mark of the animation). Remove those rules and maybe even reduce the animation-duration to suit your needs.

.animated {
  -webkit-animation-duration: .5s;
  animation-duration: .5s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  -webkit-animation-iteration-count: infinite;
}
@-webkit-keyframes bounce {
  0%, 100% {
    -webkit-transform: translateY(0);
  }
  50% {
    -webkit-transform: translateY(-5px);
  }
}
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}
.bounce {
  -webkit-animation-name: bounce;
  animation-name: bounce;
}
#animated-example {
  width: 20px;
  height: 20px;
  background-color: red;
  position: relative;
  top: 100px;
  left: 100px;
  border-radius: 50%;
}
hr {
  position: relative;
  top: 92px;
  left: -300px;
  width: 200px;
}

<div id="animated-example" class="animated bounce"></div>
<hr>

以下是浏览器将如何解释您原始的keyframe设置:

Here is how your original keyframe settings would be interpreted by the browser:

• 在0％处(即在0s或动画开始时)-translate在Y轴上按0px.
• 在20％处(即在动画的0.5s处)-translate在Y轴上按0px.
• 达到40％(即动画1s时)-translate沿Y轴倾斜0像素.
• 50％(即动画1.25秒)-translate在Y轴上缩小5像素.这导致逐渐的向上运动.
• 达到60％(即动画1.5秒)-translate在Y轴上按0px.这导致逐渐的向下运动.
• 80％(即动画2秒)-translate在Y轴上按0px.
• 在100％处(即在2.5秒或动画结束时)-translate在Y轴上按0px.

• At 0% (that is, at 0s or start of animation) - translate by 0px in Y axis.
• At 20% (that is, at 0.5s of animation) - translate by 0px in Y axis.
• At 40% (that is, at 1s of animation) - translate by 0px in Y axis.
• At 50% (that is, at 1.25s of animation) - translate by 5px in Y axis. This results in a gradual upward movement.
• At 60% (that is, at 1.5s of animation) - translate by 0px in Y axis. This results in a gradual downward movement.
• At 80% (that is, at 2s of animation) - translate by 0px in Y axis.
• At 100% (that is, at 2.5s or end of animation) - translate by 0px in Y axis.

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