纯CSS加载程动画

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html

css

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html

css

body {
  display: grid;
  overflow: hidden;
  margin: 0;
  height: 100vh;
  background: #000;
}
body::before {
  padding: 7.25em;
  background: radial-gradient(#e56589 3.25em, #6c97c3 4.25em);
  content: "";
}
body::after {
  position: absolute;
  top: calc(50% + 6.25em);
  left: 50%;
  transform: translate(-50%);
  color: rgba(255, 255, 255, 0.5);
  font: 200 1.5em/ 1.25 sans-serif;
  letter-spacing: 1px;
  text-transform: uppercase;
  animation: f 1s ease-in-out infinite alternate;
  content: "loading";
}

@keyframes f {
  to {
    opacity: 0;
  }
}
div, ::before, ::after {
  place-self: center;
  grid-column: 1;
  grid-row: 1;
}

.loader {
  display: grid;
  padding: 2em;
  background: inherit;
  filter: contrast(9);
  mix-blend-mode: multiply;
}
.loader::before, .loader::after {
  padding: 6.25em;
  --stops: #fff calc(1em - 1px), transparent 1em;
  background: radial-gradient(circle at 1em, var(--stops)), radial-gradient(circle at 50% 1em, var(--stops)), radial-gradient(circle at calc(100% - 1em), var(--stops)), radial-gradient(circle at 50% calc(100% - 1em), var(--stops));
  filter: blur(9px);
  animation: a .875s ease-in-out infinite;
  content: "";
}
.loader::before {
  animation-name: b;
}

@keyframes a {
  33.33%, 66.67% {
    padding: 1em;
  }
}
@keyframes b {
  33.33% {
    transform: rotate(0deg);
  }
  66.67%, 100% {
    transform: rotate(90deg);
  }
}

JavaScript

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