javascript - 复杂的 CSS 动画重复 - 使用 Javascript？

Question

我有一个相当复杂的 CSS 动画，即。它是分层的，或者引入两张图片，一张是背景图片，然后是 <img>在其中标记，以覆盖原始内容。

演示在这里:http://wdb.blazeoven.co.uk/

HTML:

  <div class="container">
<a href="services.php">
  <div class="col-sm-3 home-circle" id="one">
      <img class="bottom" id="five" src="/assets/img/prop-consultants.png" alt="residential block in grounds">
  </div>
</a>
<a href="services.php">
  <div class="col-sm-3 home-circle" id="two">
    <img class="bottom" id="six" src="/assets/img/chartered-surveyors.png" alt="old residential house doorways">
  </div>
</a>
<a href="services.php">
  <div class="col-sm-3 home-circle" id="three">
    <img class="bottom" id="seven" src="/assets/img/managing-agents.png" 
      alt="row of shops">
  </div>
</a>
<a href="services.php">
  <div class="col-sm-3 home-circle" id="four">
    <img class="bottom" id="eight" src="/assets/img/city-central.png" alt="City shop premises">
  </div>
</a>

CSS:

@-webkit-keyframes fadeOut { from { opacity:1; } to { opacity:0; } }
@-moz-keyframes fadeOut { from { opacity:1; } to { opacity:0; } }
@keyframes fadeOut { from { opacity:1; } to { opacity:0; } }
@-webkit-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@-moz-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }

.home-banner .container a .col-sm-3 {
   opacity:0; 
   -webkit-animation:fadeIn ease-in 1; 
   -moz-animation:fadeIn ease-in 1;
   animation:fadeIn ease-in 1;

   -webkit-animation-fill-mode:forwards; 
   -moz-animation-fill-mode:forwards;
   animation-fill-mode:forwards;

   -webkit-animation-duration:1s;
   -moz-animation-duration:1s;
   animation-duration:1s;
  }

.home-banner #one {
  background:url('/assets/img/propcons.svg') center no-repeat;
  background-size: 100%;

  -webkit-animation-delay: 0.4s;
  -moz-animation-delay: 0.4s;
  animation-delay: 0.4s;
}
.home-banner #two {
  background:url('/assets/img/charsurv.svg') center no-repeat;
  background-size: 100%;

  -webkit-animation-delay: 0.8s;
  -moz-animation-delay: 0.8s;
  animation-delay: 0.8s;
}
.home-banner #three {
  background:url('/assets/img/manage.svg') center no-repeat;
  background-size: 100%;

  -webkit-animation-delay: 1.4s;
  -moz-animation-delay: 1.4s;
  animation-delay: 1.4s;
}
.home-banner #four {
  background:url('/assets/img/citycen.svg') center no-repeat;
  background-size: 100%;

  -webkit-animation-delay: 1.8s;
  -moz-animation-delay: 1.8s;
  animation-delay: 1.8s;
}
.grey-banner img.bottom {
 opacity:1;
 -webkit-animation:fadeOut ease-in 1; 
 -moz-animation:fadeOut ease-in 1;
 animation:fadeOut ease-in 1;

 // -webkit-animation-direction: alternate;
 // -moz-animation-direction: alternate;
 // animation-direction: alternate;


 -webkit-animation-fill-mode:forwards; 
 -moz-animation-fill-mode:forwards;
 animation-fill-mode:forwards;

 -webkit-animation-duration:1s;
 -moz-animation-duration:1s;
 animation-duration:1s;
}
.grey-banner img#five {
-webkit-animation-delay: 6.8s;
-moz-animation-delay: 6.8s;
animation-delay: 6.8s;
}

.grey-banner img#six {
-webkit-animation-delay: 7.4s;
-moz-animation-delay: 7.4s;
animation-delay: 7.4s;
}

.grey-banner img#seven {
-webkit-animation-delay: 8s;
-moz-animation-delay: 8s;
animation-delay: 8s;
}
.grey-banner img#eight {
-webkit-animation-delay: 8.6s;
-moz-animation-delay: 8.6s;
animation-delay: 8.6s;
}

问题是，客户要求它再次重复。也就是说，它反向播放，然后重新开始。

我曾尝试使用 CSS 执行此操作但未成功，是否有一种简洁的方法可以使用 Javascript 执行此操作？

提前感谢您的评论。

本

Answer 1

您可以使用animation-iteration-count 重复动画:

-moz-animation-iteration-count: 3; /* Firefox 5 -> 15 */
-webkit-animation-iteration-count: 3; /* Chrome, Safari, Opera */
animation-iteration-count: 3; /* Firefox 16, IE 10 */

IE 9 及更早版本不支持。

您还可以使用值 infinite 来一遍又一遍地重复。

编辑:

正如我所说，您可以尝试使用 cubic-bezier:
不使用延迟，animation-duration:10s。您可以尝试在四个图像的动画计时函数上使用这些立方贝塞尔值:

animation-timing-function: cubic-bezier(0.2, 0.0, 0.0, 1.5);
animation-timing-function: cubic-bezier(0.4,-0.7, 0.4, 1.8);
animation-timing-function: cubic-bezier(0.7,-1.7, 0.7, 1.8);
animation-timing-function: cubic-bezier(0.9,-1.6, 0.8, 0.8);

我自己没有尝试过，我不确定它与 < 0 和 > 1(这不是标准值)的值配合得如何。

如果您想了解如何设置立方贝塞尔曲线，可以使用 http://cubic-bezier.com 上的工具。帮助找到有用的值。