教你怎么使用css3给图片添加渐变效果（代码详解）

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linear-gradient([ [ [| to [top | bottom] || [left | right] ],]?[,]+);

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linear-gradient(#fff, #333);
linear-gradient(to bottom, #fff, #333);
linear-gradient(to top, #333, #fff);
linear-gradient(180deg, #fff, #333);
linear-gradient(to bottom, #fff 0%, #333 100%);

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<div style="width: 200px; height: 200px;"></div>
<style>
  div {
    background: linear-gradient(
      to right,
      red,
      orange,
      yellow,
      green,
      blue,
      indigo,
      violet
    );
  }
</style>

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<div class="g"></div>
<style>
  .g {
    background: repeating-linear-gradient(
      -45deg,
      transprent,
      transprent 25px,
      #fff 25px,
      #fff50px
    );
  }
</style>

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radial-gradient( [ circle ||][ at]? , | [ ellipse || [|]{2}][ at]? , | [ [ circle | ellipse ] ||][ at]? , | at,[ ,]+ )

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radial-gradient(circle, #f00, #ff0, #080);
radial-gradient(circle at center, #f00, #ff0, #080);
radial-gradient(circle at 50%, #f00, #ff0, #080);
radial-gradient(circle farthest-corner, #f00, #ff0, #080);

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<style>
  div {
    width: 200px;
    height: 100px;
    margin-top: 10px;
    border: 1px solid #ddd;
  }
  .g1 {
    background: radial-gradient(circle at center, #f00, #ff0, #080);
  }
  .g2 {
    background: radial-gradient(circle closest-side, #f00, #ff0, #080);
  }
  .g3 {
    background: radial-gradient(farthest-side, #f00 20%, #ff0 50%, #080 80%);
  }
  .g4 {
    background: radial-gradient(at top right, #f00, #ff0, #080);
  }
  .g5 {
    background: radial-gradient(farthest-side at top right, #f00, #ff0, #080);
  }
  .g6 {
    background: radial-gradient(
        farthest-side at top right,
        #f00,
        #ff0,
        #080,
        transparent
      ), radial-gradient(60px at top left, #f00, #ff0, #080);
  }
</style>
<div class="g1"></div>
<div class="g2"></div>
<div class="g3"></div>
<div class="g4"></div>
<div class="g5"></div>
<div class="g6"></div>

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<style>
  div {
    width: 200px;
    height: 100px;
    border: 1px solid #ddd;
    float: left;
    margin: 10px;
  }
  .g1 {
    background: repeating-radial-gradient(circle, #f00 0, #ff0 10%, #f00 15%);
  }
  .g2 {
    background: repeating-radial-gradient(
      at top left,
      #f00,
      #ff0 10%,
      #080 15%,
      #ff0 20%,
      #f00 25%
    );
  }
  .g3 {
    background: repeating-radial-gradient(
      circle closest-corner at 20px 50px,
      #f00,
      #ff0 10%,
      #080 20%,
      #ff0 30%,
      #f00 40%
    );
  }
</style>

<div class="g1"></div>
<div class="g2"></div>
<div class="g3"></div>

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<style>
  @keyframes up {
    0% {
      top: 100%;
    }
    100% {
      top: -100px;
    }
  }
  .blister {
    position: absolute;
    width: 80px;
    height: 80px;
    display: block;
    border-radius: 50%;
    // left: 300px;
    overflow: hidden;
    animation: up 20s linear infinite;
    bottom: -100%;
    background: rgba(255, 255, 255, 0.1);
    cursor: pointer;
    &:hover {
      animation-play-state: paused;
    }
    &::before {
      content: "";
      left: 0;
      top: 0;
      height: 100%;
      width: 100%;
      box-shadow: 0 0 20px #fff inset;
      position: absolute;
      border-radius: 50%;
    }
    .light {
      border-radius: 50%;
      width: 75px;
      height: 54px;
      transform: rotate(140deg);
      top: -24px;
      position: absolute;
      left: -18px;
      display: block;
      background: radial-gradient(farthest-side, #fff, rgba(255, 255, 255, 0));
    }
    .light2 {
      width: 24px;
      height: 15px;
      position: absolute;
      bottom: 9px;
      right: 15px;
      transform: rotate(-25deg);
      border-radius: 50%;
      display: block;
      background: radial-gradient(farthest-side, #fff, rgba(255, 255, 255, 0));
    }
  }
</style>

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<span class="blister">
  <span class="light"></span>
  <span class="light2"></span>
</span>