落雪飘落动画

下载代码

html

css

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html

css

body {
  background-color: #9dc0ca;
  padding: 0px;
  margin: 0px;
}

#snowbanner {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  pointer-events: none;
  background-image: url("https://waveciou.github.io/FrontEndDesign/snow-fall/img/mountains.svg");
  background-size: cover;
  background-position: center bottom;
  background-repeat: repeat no-repeat;
}
#snowbanner .snow {
  background-image: url("https://waveciou.github.io/FrontEndDesign/snow-fall/img/snow.png");
  background-repeat: repeat;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  transition: opacity 3s;
}
#snowbanner .snow.snow-1 {
  -webkit-animation-name: animateone;
          animation-name: animateone;
  background-size: 500px 500px;
}
#snowbanner .snow.snow-2 {
  -webkit-animation-name: animatetwo;
          animation-name: animatetwo;
  background-size: 300px 300px;
}

@-webkit-keyframes animateone {
  0% {
    background-position: 0px 0px;
  }
  100% {
    background-position: 500px 500px;
  }
}

@keyframes animateone {
  0% {
    background-position: 0px 0px;
  }
  100% {
    background-position: 500px 500px;
  }
}
@-webkit-keyframes animatetwo {
  0% {
    background-position: 0px 0px;
  }
  100% {
    background-position: 300px 900px;
  }
}
@keyframes animatetwo {
  0% {
    background-position: 0px 0px;
  }
  100% {
    background-position: 300px 900px;
  }
}
.snow-speed-wrapper {
  position: fixed;
  width: 100%;
  bottom: 20px;
  z-index: 1000;
}
.snow-speed-wrapper .snow-speed-range {
  width: calc(100% - 40px);
  margin: auto;
  max-width: 500px;
  padding: 10px 30px;
  background: rgba(0, 0, 0, 0.3);
  transition: background 0.5s ease;
  border-radius: 5px;
  box-sizing: border-box;
}
.snow-speed-wrapper .snow-speed-range:hover {
  background: rgba(0, 0, 0, 0.5);
}

#range-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 10px;
  border-radius: 5px;
  background: #d7dcdf;
  outline: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
}
#range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
          appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 100%;
  background-color: #fff;
}

JavaScript

(function() {
  let speedSlider = document.querySelector("#range-slider");
  let speedValue = speedSlider.value;
  let snow = document.querySelectorAll("#snowbanner .snow");
  let snowSwitch = true;

speedSlider.addEventListener("input", function() {
    speedValue = speedSlider.value;
    setSeconds();
  });

function setSeconds() {
    let seconds = (100 - speedValue) * 0.2;
    if (seconds < 0.5) {
      seconds = 0.5;
    }

seconds >= 20 ? (snowSwitch = false) : (snowSwitch = true);

snow.forEach(element => {
      element.style.WebkitAnimationDuration = `${seconds}s`;
      element.style.animationDuration = `${seconds}s`;

if (snowSwitch) {
        element.style.WebkitAnimationIterationCount = "infinite";
        element.style.animationIterationCount = "infinite";
        element.style.opacity = "1";
      } else {
        element.style.WebkitAnimationIterationCount = "1";
        element.style.animationIterationCount = "1";
        element.style.opacity = "0";
      }
    });
  }
  setSeconds();
})();

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