全页视差滚动效果

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html

css

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html

css

@import url(https://fonts.googleapis.com/css?family=Montserrat);
html, body {
  overflow: hidden;
}

.background {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  overflow: hidden;
  will-change: transform;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  height: 130vh;
  position: fixed;
  width: 100%;
  transform: translateY(30vh);
  transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
}
.background:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
}
.background:first-child {
  background-image: url(https://images.unsplash.com/photo-1595856984276-8f6d5e979f4d?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2500&q=80);
  transform: translateY(-15vh);
}
.background:first-child .content-wrapper {
  transform: translateY(15vh);
}
.background:nth-child(2) {
  background-image: url(https://images.unsplash.com/photo-1614812863983-eac2f4ef4810?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2415&q=80);
}
.background:nth-child(3) {
  background-image: url(https://images.unsplash.com/photo-1617720148181-fa706b09d045?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2434&q=80);
}

/* Set stacking context of slides */
.background:nth-child(1) {
  z-index: 3;
}

.background:nth-child(2) {
  z-index: 2;
}

.background:nth-child(3) {
  z-index: 1;
}

.content-wrapper {
  height: 100vh;
  display: flex;
  justify-content: center;
  text-align: center;
  flex-flow: column nowrap;
  color: #fff;
  font-family: Montserrat;
  text-transform: uppercase;
  transform: translateY(40vh);
  will-change: transform;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  transition: all 1.7s cubic-bezier(0.22, 0.44, 0, 1);
}
.content-title {
  font-size: 12vh;
  line-height: 1.4;
}

.background.up-scroll {
  transform: translate3d(0, -15vh, 0);
}
.background.up-scroll .content-wrapper {
  transform: translateY(15vh);
}
.background.up-scroll + .background {
  transform: translate3d(0, 30vh, 0);
}
.background.up-scroll + .background .content-wrapper {
  transform: translateY(30vh);
}

.background.down-scroll {
  transform: translate3d(0, -130vh, 0);
}
.background.down-scroll .content-wrapper {
  transform: translateY(40vh);
}
.background.down-scroll + .background:not(.down-scroll) {
  transform: translate3d(0, -15vh, 0);
}
.background.down-scroll + .background:not(.down-scroll) .content-wrapper {
  transform: translateY(15vh);
}

JavaScript

// ------------- VARIABLES ------------- //
var ticking = false;
var isFirefox = (/Firefox/i.test(navigator.userAgent));
var isIe = (/MSIE/i.test(navigator.userAgent)) || (/Trident.*rv\:11\./i.test(navigator.userAgent));
var scrollSensitivitySetting = 30; //Increase/decrease this number to change sensitivity to trackpad gestures (up = less sensitive; down = more sensitive) 
var slideDurationSetting = 600; //Amount of time for which slide is "locked"
var currentSlideNumber = 0;
var totalSlideNumber = $(".background").length;

// ------------- DETERMINE DELTA/SCROLL DIRECTION ------------- //
function parallaxScroll(evt) {
  if (isFirefox) {
    //Set delta for Firefox
    delta = evt.detail * (-120);
  } else if (isIe) {
    //Set delta for IE
    delta = -evt.deltaY;
  } else {
    //Set delta for all other browsers
    delta = evt.wheelDelta;
  }

if (ticking != true) {
    if (delta <= -scrollSensitivitySetting) {
      //Down scroll
      ticking = true;
      if (currentSlideNumber !== totalSlideNumber - 1) {
        currentSlideNumber++;
        nextItem();
      }
      slideDurationTimeout(slideDurationSetting);
    }
    if (delta >= scrollSensitivitySetting) {
      //Up scroll
      ticking = true;
      if (currentSlideNumber !== 0) {
        currentSlideNumber--;
      }
      previousItem();
      slideDurationTimeout(slideDurationSetting);
    }
  }
}

// ------------- SET TIMEOUT TO TEMPORARILY "LOCK" SLIDES ------------- //
function slideDurationTimeout(slideDuration) {
  setTimeout(function() {
    ticking = false;
  }, slideDuration);
}

// ------------- ADD EVENT LISTENER ------------- //
var mousewheelEvent = isFirefox ? "DOMMouseScroll" : "wheel";
window.addEventListener(mousewheelEvent, _.throttle(parallaxScroll, 60), false);

// ------------- SLIDE MOTION ------------- //
function nextItem() {
  var $previousSlide = $(".background").eq(currentSlideNumber - 1);
  $previousSlide.removeClass("up-scroll").addClass("down-scroll");
}

function previousItem() {
  var $currentSlide = $(".background").eq(currentSlideNumber);
  $currentSlide.removeClass("down-scroll").addClass("up-scroll");
}

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