使用CSS3动画加速闪烁计时器

Question

我正在构建一个带有计时器的智力竞赛应用程序（从10s到0s）。当时间接近0时，我希望我的文本闪烁得越来越快。当计时器在10秒左右时，我希望在剩下的时间较少时减少2秒的过渡时间。

有没有办法用CSS3解决这个问题

Answer 1

您可以设置具有不同关键帧的动画，并将每个关键帧的持续时间设置得越来越短

div {
    font-size: 40px;
    -webkit-animation: blink 10s 2s;
    animation: blink 10s 2s;
}
@-webkit-keyframes blink {
    0%  {color: blue;}
   10%  {color: yellow;}
   20%  {color: blue;}
   29%  {color: yellow;}
   38%  {color: blue;}
   46%  {color: yellow;}
   54%  {color: blue;}
   61%  {color: yellow;}
   68%  {color: blue;}
   74%  {color: yellow;}
   80%  {color: blue;}
   85%  {color: yellow;}
   90%  {color: blue;}
   92%  {color: yellow;}
   94%  {color: blue;}
   96%  {color: yellow;}
   98%  {color: blue;}
  100%  {color: yellow;}
 }
@keyframes blink {
    0%  {color: blue;}
   10%  {color: yellow;}
   20%  {color: blue;}
   29%  {color: yellow;}
   38%  {color: blue;}
   46%  {color: yellow;}
   54%  {color: blue;}
   61%  {color: yellow;}
   68%  {color: blue;}
   74%  {color: yellow;}
   80%  {color: blue;}
   85%  {color: yellow;}
   90%  {color: blue;}
   92%  {color: yellow;}
   94%  {color: blue;}
   96%  {color: yellow;}
   98%  {color: blue;}
  100%  {color: yellow;}
 }

<div>TEST</div>

Answer 2

假设您使用的是带有以下"眨眼"的CSS动画

@keyframes blink{
  0% {
    opacity: 0 
  }
  50% {
    opacity: 1 
  }
  100% {
    opacity: 0 
  }
}

您可以指定类似ease-in和ease-out的CSS计时功能来提高和降低速度：https://developer.mozilla.org/en-US/docs/Web/CSS/animation-timing-function.自定义的边框计时将允许您微调速率。