html - 如何仅从 css 更改图像？

Question

我有这个样本:

link

代码 HTML:

<div id="cf2" class="shadow">
  <img class="bottom" src="http://assets.sport.ro/assets/protv/2014/12/31/image_galleries/40908/cele-mai-frumoase-peisaje-din-lume-locurile-pe-care-trebuie-sa-le-vizitezi_1_size19.jpg" />
  <img class="top" src="http://assets.sport.ro/assets/protv/2014/12/31/image_galleries/40908/cele-mai-frumoase-peisaje-din-lume-locurile-pe-care-trebuie-sa-le-vizitezi.jpg" />
</div>

代码 CSS:

img{
  width:300px;
}
@keyframes cf3FadeInOut {
  0% {
    opacity:1;
  }
  45% {
    opacity:1;
  }
  55% {
    opacity:0;
  }
  100% {
    opacity:0;
  }
}

#cf3 img.top {
    animation-name: cf3FadeInOut;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-duration: 10s;
    animation-direction: alternate;
}

我想使用关键帧在它们之间交换图像。

我试图重现其中一个例子 here但有些东西不起作用。

你能告诉我我做错了什么吗？提前致谢!

Answer 1

您在 css 中访问了错误的 id

img{
  width:300px;
  /* added this position to make images overlap */
  position: absolute; 
}
@keyframes cf3FadeInOut {
  0% {
    opacity:1;
  }
  45% {
    opacity:1;
  }
  55% {
    opacity:0;
  }
  100% {
    opacity:0;
  }
}

/* here your name of id was wrong */
#cf2 img.top {
    animation-name: cf3FadeInOut;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-duration: 2s;
    animation-direction: alternate;
}

<div id="cf2" class="shadow">
  <img class="bottom" src="http://assets.sport.ro/assets/protv/2014/12/31/image_galleries/40908/cele-mai-frumoase-peisaje-din-lume-locurile-pe-care-trebuie-sa-le-vizitezi_1_size19.jpg" />
  <img class="top" src="http://assets.sport.ro/assets/protv/2014/12/31/image_galleries/40908/cele-mai-frumoase-peisaje-din-lume-locurile-pe-care-trebuie-sa-le-vizitezi.jpg" />
</div>