跳跃预加载动画

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html

css

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html

css

* {
  border: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}

body {
  background: #1f1f1f;
  display: grid;
  font: 1em/1.5 sans-serif;
  place-items: center;
  height: 100vh;
}

.pl {
  width: 6em;
  height: 6em;
}
.pl__ring {
  animation: ringA 2s linear infinite;
}
.pl__ring--a {
  stroke: #f42f25;
}
.pl__ring--b {
  animation-name: ringB;
  stroke: #f49725;
}
.pl__ring--c {
  animation-name: ringC;
  stroke: #255ff4;
}
.pl__ring--d {
  animation-name: ringD;
  stroke: #f42582;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  body {
    background: #17181c;
  }
}
/* Animations */
@keyframes ringA {
  from, 4% {
    stroke-dasharray: 0 660;
    stroke-width: 20;
    stroke-dashoffset: -330;
  }
  12% {
    stroke-dasharray: 60 600;
    stroke-width: 30;
    stroke-dashoffset: -335;
  }
  32% {
    stroke-dasharray: 60 600;
    stroke-width: 30;
    stroke-dashoffset: -595;
  }
  40%, 54% {
    stroke-dasharray: 0 660;
    stroke-width: 20;
    stroke-dashoffset: -660;
  }
  62% {
    stroke-dasharray: 60 600;
    stroke-width: 30;
    stroke-dashoffset: -665;
  }
  82% {
    stroke-dasharray: 60 600;
    stroke-width: 30;
    stroke-dashoffset: -925;
  }
  90%, to {
    stroke-dasharray: 0 660;
    stroke-width: 20;
    stroke-dashoffset: -990;
  }
}
@keyframes ringB {
  from, 12% {
    stroke-dasharray: 0 220;
    stroke-width: 20;
    stroke-dashoffset: -110;
  }
  20% {
    stroke-dasharray: 20 200;
    stroke-width: 30;
    stroke-dashoffset: -115;
  }
  40% {
    stroke-dasharray: 20 200;
    stroke-width: 30;
    stroke-dashoffset: -195;
  }
  48%, 62% {
    stroke-dasharray: 0 220;
    stroke-width: 20;
    stroke-dashoffset: -220;
  }
  70% {
    stroke-dasharray: 20 200;
    stroke-width: 30;
    stroke-dashoffset: -225;
  }
  90% {
    stroke-dasharray: 20 200;
    stroke-width: 30;
    stroke-dashoffset: -305;
  }
  98%, to {
    stroke-dasharray: 0 220;
    stroke-width: 20;
    stroke-dashoffset: -330;
  }
}
@keyframes ringC {
  from {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: 0;
  }
  8% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -5;
  }
  28% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -175;
  }
  36%, 58% {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: -220;
  }
  66% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -225;
  }
  86% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -395;
  }
  94%, to {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: -440;
  }
}
@keyframes ringD {
  from, 8% {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: 0;
  }
  16% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -5;
  }
  36% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -175;
  }
  44%, 50% {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: -220;
  }
  58% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -225;
  }
  78% {
    stroke-dasharray: 40 400;
    stroke-width: 30;
    stroke-dashoffset: -395;
  }
  86%, to {
    stroke-dasharray: 0 440;
    stroke-width: 20;
    stroke-dashoffset: -440;
  }
}

JavaScript

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