css3几个常用动效

1.放大的圈

@keyframes zoom3 {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  70% {
    opacity: 1;
  }
  100% {
    opacity: 0.7;
    transform: scale(1);
  }
}

.play {
  position: absolute;
  left: 14.62rem;
  top: 4.12rem;
  margin: 1rem auto;
  width: 0.38rem;
  height: 0.43rem;
  cursor: pointer;
  background: url(./images/play.png) no-repeat center / 100% 100%;

  &::after {
    content: "";
    .size(0.7rem, 0.7rem);
    animation: zoom3 2s ease-in-out infinite;
    border: 1px solid hsla(0, 0%, 100%, 0.6);
    border-radius: 100%;
    position: absolute;
    transform-origin: center;
    right: -0.12rem;
    bottom: -0.12rem;
  }
  &::before {
    content: "";
    .size(0.6rem, 0.6rem);
    animation: zoom3 2s ease-in-out 0.4s infinite;
    right: -0.08rem;
    bottom: -0.08rem;
    border: 1px solid hsla(0, 0%, 100%, 0.6);
    border-radius: 100%;
    position: absolute;
    transform-origin: center;
  }
}

2.呼吸（忽大忽小）

.play {
  position: absolute;
  left: 14.62rem;
  top: 4.12rem;
  margin: 1rem auto;
  width: 0.38rem;
  height: 0.43rem;
  cursor: pointer;
  background: url(./images/play.png) no-repeat center / 100% 100%;

  animation: zoom2 2s ease-in-out infinite alternate;
}

@keyframes zoom2 {
  from {
    transform: scale(1);
  }

  to {
    transform: scale(0.8);
  }
}

3.小圈旋转

.play {
  position: absolute;
  left: 14.62rem;
  top: 4.12rem;
  margin: 1rem auto;
  width: 0.38rem;
  height: 0.43rem;
  cursor: pointer;
  background: url(./images/play.png) no-repeat center / 100% 100%;

  &::before {
    content: "";
    .size(0.6rem, 0.6rem);
    background: url(./images/circle2.png) no-repeat center / 100% 100%;
    position: absolute;
    right: -0.08rem;
    bottom: -0.08rem;
    pointer-events: none;
    animation: circle 6s linear infinite;
  }
  &::after {
    content: "";
    .size(0.66rem, 0.66rem);
    background: url(./images/circle2.png) no-repeat center / 100% 100%;
    position: absolute;
    right: -0.11rem;
    bottom: -0.11rem;
    pointer-events: none;
    animation: circle2 6s linear infinite;
  }
}

@keyframes circle {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(-360deg);
  }
}

@keyframes circle2 {
  0% {
    transform: rotate(-315deg);
  }
  100% {
    transform: rotate(45deg);
  }
}