纯CSS加载动画

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html

<style>body { --tan: 0.087; --m: 3 }.lyr:nth-child(1) { --c: 0 }.lyr:nth-child(2) { --c: 1 }.lyr:nth-child(3) { --c: 2 }
</style>
<div class="dot" style="--k: 0">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.028">
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</div>
<div class="dot" style="--k: 0.056">
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</div>
<div class="dot" style="--k: 0.083">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.111">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.139">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.167">
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</div>
<div class="dot" style="--k: 0.194">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.222">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.25">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.278">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.306">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.333">
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</div>
<div class="dot" style="--k: 0.361">
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</div>
<div class="dot" style="--k: 0.389">
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</div>
<div class="dot" style="--k: 0.417">
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</div>
<div class="dot" style="--k: 0.444">
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</div>
<div class="dot" style="--k: 0.472">
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</div>
<div class="dot" style="--k: 0.5">
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</div>
<div class="dot" style="--k: 0.528">
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</div>
<div class="dot" style="--k: 0.556">
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</div>
<div class="dot" style="--k: 0.583">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.611">
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</div>
<div class="dot" style="--k: 0.639">
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</div>
<div class="dot" style="--k: 0.667">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.694">
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</div>
<div class="dot" style="--k: 0.722">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.75">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.778">
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.806">
  <div class="lyr"></div>
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.833">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.861">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.889">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.917">
  <div class="lyr"></div>
  <div class="lyr"></div>
  <div class="lyr"></div>
</div>
<div class="dot" style="--k: 0.944">
  <div class="lyr"></div>
  <div class="lyr"></div>
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</div>
<div class="dot" style="--k: 0.972">
  <div class="lyr"></div>
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</div>

css

#btn--yp {
  box-sizing: content-box;
  position: fixed;
  z-index: 9;
  bottom: 1em;
  right: 1em;
  border: solid 1em transparent;
  width: 4.625em;
  height: 3.25em;
  background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/2017/icon-yp.svg) 50%/cover content-box;
  font: 16px/ 1.25 trebuchet ms, sans-serif;
  text-indent: 200vw;
  text-shadow: none;
  filter: grayscale(1) drop-shadow(0 0 1px #e8e0e0);
  transition: .5s;
  white-space: nowrap;
}
#btn--yp:before {
  box-sizing: inherit;
  position: absolute;
  left: 0;
  bottom: 100%;
  margin: 1em -.5em;
  padding: .5em;
  width: 100%;
  border-radius: 5px;
  background: #e8e0e0;
  color: #000;
  text-align: center;
  text-decoration: none;
  text-indent: 0vw;
  white-space: normal;
  animation: float 1s ease-in-out infinite alternate;
  content: attr(data-txt);
}
#btn--yp:hover, #btn--yp:focus {
  outline: none;
  filter: grayscale(0) drop-shadow(0 0 1px crimson);
}

@keyframes float {
  to {
    transform: translateY(0.75em);
  }
}
body {
  display: grid;
  margin: 0;
  height: 100vh;
  background: #000;
}

div {
  grid-area: 1/1;
}

.dot {
  display: grid;
  place-self: center;
  transform: rotate(calc(var(--k)*1turn)) translate(calc(0.5em/var(--tan)));
}

@keyframes a {
  to {
    transform: scale(0);
  }
}
.lyr {
  --t: calc((1 + var(--c))*1s);
  padding: 0.5em;
  border-radius: 50%;
  background: hsl(calc(var(--c)/var(--m)*360), 100%, 50%);
  mix-blend-mode: screen;
  animation: a var(--t) ease-in-out calc(var(--k)*-2*var(--t)) infinite alternate;
}

JavaScript

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