html - 使用关键帧动画的文本 slider

Question

我有一个 slider ，其中包含 3 个元素，其中一切正常，如我所愿

这里是现场演示 working demo

包含 3 个元素的文本 slider

HTML

    <span class="item-1">FAST.</span>
    <span class="item-2">SIMPLE.</span>
    <span class="item-3">PERSONAL.</span>

CSS

body {
  font-family: 'Open Sans', 'sans-serif';
  color: #cecece;
  background: #222;
  overflow: hidden;
}

.item-1,
.item-2,
.item-3 {
  position: absolute;
  display: block;
  top: 2em;
  width: 60%;
  font-size: 2em;
  animation-duration: 20s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.item-1 {
  animation-name: anim-1;
}

.item-2 {
  animation-name: anim-2;
}

.item-3 {
  animation-name: anim-3;
}

@keyframes anim-1 {
  0%,
  8.3% {
    top: -100%;
    opacity: 0;
  }
  8.3%,
  25% {
    top: 25%;
    opacity: 1;
  }
  33.33%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-2 {
  0%,
  33.33% {
    top: -100%;
    opacity: 0;
  }
  41.63%,
 58.29%  {
    top: 25%;
    opacity: 1;
  }
  66.66%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-3 {
  0%,
  66.66% {
    top: -100%;
    opacity: 0;
  }
  74.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

现在我想在 slider 上添加两个元素

HTML

        <span class="item-1">FAST.</span>
        <span class="item-2">SIMPLE.</span>
        <span class="item-3">PERSONAL.</span>
        <span class="item-4">SOCIAL.</span>             
        <span class="item-5">LOUD.</span>  

CSS

body {
  font-family: 'Open Sans', 'sans-serif';
  color: #cecece;
  background: #222;
  overflow: hidden;
}

.item-1,
.item-2,
.item-3,
.item-4,
.item-5{
  position: absolute;
  display: block;
  top: 2em;
  width: 60%;
  font-size: 2em;
  animation-duration: 20s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.item-1 {
  animation-name: anim-1;
}

.item-2 {
  animation-name: anim-2;
}

.item-3 {
  animation-name: anim-3;
}
.item-4{
    animation-name: anim-4;
}
.item-5{
    animation-name: anim-5;
}

@keyframes anim-1 {
  0%,
  6.3% {
    top: -100%;
    opacity: 0;
  }
  6.3%,
  25% {
    top: 25%;
    opacity: 1;
  }
  13.33%,
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-2 {
  0%,
  23.33% {
    top: -100%;
    opacity: 0;
  }

  31.63%,
  48.29% {
    top: 25%;
    opacity: 1;
  }

  56.66%,
  100% {
    top: 110%;
    opacity: 0;
  }

}

@keyframes anim-3 {
  0%,
  56.66% {
    top: -100%;
    opacity: 0;
  }
  64.96%,
  71.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-4 {
  0%,
  71.66% {
    top: -100%;
    opacity: 0;
  }
  84.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }
  100% {
    top: 110%;
    opacity: 0;
  }
}

@keyframes anim-5 {
  0%,
  84.96% {
    top: -100%;
    opacity: 0;
  }

  94.96%,
  91.62% {
    top: 25%;
    opacity: 1;
  }

  100% {
    top: 110%;
    opacity: 0;
  }
}

这里有五个元素的演示

not working demo

我的代码需要更改什么？

Answer 1

问题是由于五种不同动画的百分比困惑所致。

为什么不重复使用相同的动画，比如:

@keyframes anim {
  0%, 33.33% {
    top: -100%;
    opacity: 0;
  }
  33.33%, 50% {
    top: 25%;
    opacity: 1;
  }
  50%, 100% {
    top: 110%;
    opacity: 0;
  }
}

然后在每个 span 上应用 animation-delay，例如:

.item-1 { animation-delay: 0s }
.item-2 { animation-delay: 4s }
.item-3 { animation-delay: 8s }
.item-4{ animation-delay: 12s }
.item-5{ animation-delay: 16s }

Here是一个工作示例。

提示 请记住，动画化 top 值并不是性能方面的最佳选择。尽可能尝试为 transform 和 opacity 值设置动画。