如何在 CSS 和 HTML 中将动画分层放在另一个动画后面？答案

【问题标题】：How to layer animation behind another animation in CSS and HTML?如何在 CSS 和 HTML 中将动画分层放在另一个动画后面？
【发布时间】：2020-08-14 00:14:06
【问题描述】：

我正在努力弄清楚如何对 2 层不同的动画进行分层。我想在移动的月亮动画和网站瓷砖后面制作闪烁的星星动画（这样背景本质上就是闪烁的星星和移动的月亮）。现在，它只是叠加在月球动画和标题之上，完全覆盖它们，并且位置已关闭。我对 HTML 比较陌生，所以如果我的问题很明显，请原谅。 TIA

@keyframes moon {
  0% {
    box-shadow: -150px 0px 0px 0px white;
    transform: rotate(-10deg);
  }
  50% {
    box-shadow: 0px 0px 0px 0px white;
  }
  100% {
    box-shadow: 150px 0px 0px 0px white;
    transform: rotate(10deg);
  }
  z-index: -1;
  position: relative;
}

@keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-webkit-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-moz-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-ms-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

.stars,
.twinkling {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.stars {
  background: #000 url(http://www.script-tutorials.com/demos/360/images/stars.png) repeat top center;
  z-index: -1;
}

.twinkling {
  background: transparent url(http://www.script-tutorials.com/demos/360/images/twinkling.png) repeat top center;
  z-index: 0;
  -moz-animation: move-twink-back 200s linear infinite;
  -ms-animation: move-twink-back 200s linear infinite;
  -o-animation: move-twink-back 200s linear infinite;
  -webkit-animation: move-twink-back 200s linear infinite;
  animation: move-twink-back 200s linear infinite;
}

html {
  z-index: -1;
  position: relative;
  background-image: linear-gradient(black 80%, #041931, #fff);
  background-repeat: no-repeat;
  height: 45%;
}

body {
  font-family: 'Manrope', sans-serif;
  background: none;
}

div {
  background: none;
  z-index: 1;
}

.moon {
  z-index: -1;
  position: relative;
  width: 10rem;
  height: 10rem;
  background: #0a0a0a;
  margin: 1rem auto;
  animation: moon 20s linear infinite alternate;
  border-radius: 50%;
  box-shadow: inset -10rem 0 whitesmoke;
  transform: rotate(-10deg);
}

<html>
<style>
  div {
    margin: 10%;
  }
</style>

<body>
  <h1 id="text">
    <center> Welcome to my Site! </center>
  </h1>
  <div class="moon"></div>
  <div class="stars"></div>
  <div class="twinkling"></div>
  <div class="maintext">
    <h2>This is text below the animations</h2>
  </div>
  <script type="text/javascript">
    setTimeout(function() {
      $('.moon').css("animation-play-state", "paused");
    }, 20000)
  </script>
</body>

</html>

【问题讨论】：

标签： javascript html jquery css animation

【解决方案1】：

您不需要将z-index 添加到所有元素，因为定位看起来不规则。我刚刚删除了其他部分的 z-index 并将它们包含在相关部分中，即moon、stars 和twinkling。

我还必须删除 div 元素上设置的边距。以全屏模式查看演示。

@keyframes moon {
  0% {
    box-shadow: -150px 0px 0px 0px white;
    transform: rotate(-10deg);
  }
  50% {
    box-shadow: 0px 0px 0px 0px white;
  }
  100% {
    box-shadow: 150px 0px 0px 0px white;
    transform: rotate(10deg);
  }
  position: relative;
}

@keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-webkit-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-moz-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-ms-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

.stars,
.twinkling {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.stars {
  background: #000 url(http://www.script-tutorials.com/demos/360/images/stars.png) repeat top center;
  z-index: -3;
}

.twinkling {
  background: transparent url(http://www.script-tutorials.com/demos/360/images/twinkling.png) repeat top center;
  -moz-animation: move-twink-back 200s linear infinite;
  -ms-animation: move-twink-back 200s linear infinite;
  -o-animation: move-twink-back 200s linear infinite;
  -webkit-animation: move-twink-back 200s linear infinite;
  animation: move-twink-back 200s linear infinite;
  z-index: -2;
}

html, body {
  font-family: 'Manrope', sans-serif;
  height: 100%;
}

.moon {
  position: relative;
  width: 10rem;
  height: 10rem;
  background: #0a0a0a;
  margin: 1rem auto;
  animation: moon 20s linear infinite alternate;
  border-radius: 50%;
  box-shadow: inset -10rem 0 whitesmoke;
  transform: rotate(-10deg);
  z-index: -1;
}

#text, .maintext { color: white; text-align: center; margin-top: 25px; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<html>
<style>

</style>

<body>
  <div class="header">
    <h1 id="text">
      <center> Welcome to my Site! </center>
    </h1>
  </div>
  <div class="animation-part">
    <div class="twinkling"></div>
    <div class="moon"></div>
    <div class="stars"></div>
  </div>
  <div class="maintext">
    <h2>This is text below the animations</h2>
  </div>
  <script type="text/javascript">
    setTimeout(function() {
      $('.moon').css("animation-play-state", "paused");
    }, 20000)
  </script>
</body>

</html>

【讨论】：

这太棒了！ “欢迎来到我的网站！”有什么原因吗？不再可见？
那是因为造型不完美。我不得不删除 45% 的高度。为文本添加颜色。
谢谢！你认为有可能用闪烁的星星将渐变保持在底部吗？当我们把它放在月球后面时它就消失了
检查其他答案。这会很有帮助。我以为你想要一个全屏的身体背景。但我建议您使用响应式框架semantic-ui.com 来开发您的网页。为每个部分编写代码非常耗时。

【解决方案2】：

此 z-index 和 css 调整将解决您的问题。

@keyframes moon {
  0% {
    box-shadow: -150px 0px 0px 0px white;
    transform: rotate(-10deg);
  }
  50% {
    box-shadow: 0px 0px 0px 0px white;
  }
  100% {
    box-shadow: 150px 0px 0px 0px white;
    transform: rotate(10deg);
  }
  z-index: -1;
  position: relative;
}

@keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-webkit-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-moz-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

@-ms-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}

html {
  background-image: linear-gradient(black 80%, #041931, #fff);
  background-repeat: no-repeat;
  height: 45%;
}

body {
  font-family: 'Manrope', sans-serif;
  background: none;
  color: #fff;
  position: relative;
  margin:0;
  padding:0;
}

.stars,
.twinkling {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.stars {
  background: #000 url(http://www.script-tutorials.com/demos/360/images/stars.png) top center;
  background-size: cover;
  z-index: -1;
  width: 100%;
}

.twinkling {
  background: transparent url(http://www.script-tutorials.com/demos/360/images/twinkling.png) repeat top center;
  z-index: -1;
  -moz-animation: move-twink-back 200s linear infinite;
  -ms-animation: move-twink-back 200s linear infinite;
  -o-animation: move-twink-back 200s linear infinite;
  -webkit-animation: move-twink-back 200s linear infinite;
  animation: move-twink-back 200s linear infinite;
}

.moon {
  z-index: 1;
  position: relative;
  width: 10rem;
  height: 10rem;
  background: #000000;
  margin: 1rem auto;
  animation: moon 20s linear infinite alternate;
  border-radius: 50%;
  box-shadow: inset -10rem 0 whitesmoke;
  transform: rotate(-10deg);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <h1 id="text">
    <center> Welcome to my Site! </center>
  </h1>
  <div class="moon"></div>
  <div class="stars"></div>
  <div class="twinkling"></div>
  <div class="maintext">
    <h2>This is text below the animations</h2>
  </div>
  <script type="text/javascript">
    setTimeout(function() {
      $('.moon').css("animation-play-state", "paused");
    }, 20000)
  </script>
</body>
</html>

【讨论】：