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!function(e,n){"function"==typeof define&&define.amd?define(["ScrollMagic","TweenMax","TimelineMax"],n):"object"==typeof exports?(require("gsap"),n(require("scrollmagic"),TweenMax,TimelineMax)):n(e.ScrollMagic||e.jQuery&&e.jQuery.ScrollMagic,e.TweenMax||e.TweenLite,e.TimelineMax||e.TimelineLite)}(this,function(e,n,o){"use strict";var t=window.console||{},r=Function.prototype.bind.call(t.error||t.log||function(){},t);e||r("(animation.gsap) -> ERROR: The ScrollMagic main module could not be found. Please make sure it's loaded before this plugin or use an asynchronous loader like requirejs."),n||r("(animation.gsap) -> ERROR: TweenLite or TweenMax could not be found. Please make sure GSAP is loaded before ScrollMagic or use an asynchronous loader like requirejs."),e.Scene.addOption("tweenChanges",!1,function(e){return!!e}),e.Scene.extend(function(){var e,t=this,r=function(){t._log&&(Array.prototype.splice.call(arguments,1,0,"(animation.gsap)","->"),t._log.apply(this,arguments))};t.on("progress.plugin_gsap",function(){i()}),t.on("destroy.plugin_gsap",function(e){t.removeTween(e.reset)});var i=function(){if(e){var n=t.progress(),o=t.state();e.repeat&&-1===e.repeat()?"DURING"===o&&e.paused()?e.play():"DURING"===o||e.paused()||e.pause():n!=e.progress()&&(0===t.duration()?n>0?e.play():e.reverse():t.tweenChanges()&&e.tweenTo?e.tweenTo(n*e.duration()):e.progress(n).pause())}};t.setTween=function(a,s,l){var c;arguments.length>1&&(arguments.length<3&&(l=s,s=1),a=n.to(a,s,l));try{(c=o?new o({smoothChildTiming:!0}).add(a):a).pause()}catch(e){return r(1,"ERROR calling method 'setTween()': Supplied argument is not a valid TweenObject"),t}if(e&&t.removeTween(),e=c,a.repeat&&-1===a.repeat()&&(e.repeat(-1),e.yoyo(a.yoyo())),t.tweenChanges()&&!e.tweenTo&&r(2,"WARNING: tweenChanges will only work if the TimelineMax object is available for ScrollMagic."),e&&t.controller()&&t.triggerElement()&&t.loglevel()>=2){var u=n.getTweensOf(t.triggerElement()),p=t.controller().info("vertical");u.forEach(function(e,n){var o=e.vars.css||e.vars;if(p?void 0!==o.top||void 0!==o.bottom:void 0!==o.left||void 0!==o.right)return r(2,"WARNING: Tweening the position of the trigger element affects the scene timing and should be avoided!"),!1})}if(parseFloat(TweenLite.version)>=1.14)for(var g,d,f=e.getChildren?e.getChildren(!0,!0,!1):[e],w=function(){r(2,"WARNING: tween was overwritten by another. To learn how to avoid this issue see here: https://github.com/janpaepke/ScrollMagic/wiki/WARNING:-tween-was-overwritten-by-another")},h=0;h<f.length;h++)g=f[h],d!==w&&(d=g.vars.onOverwrite,g.vars.onOverwrite=function(){d&&d.apply(this,arguments),w.apply(this,arguments)});return r(3,"added tween"),i(),t},t.removeTween=function(n){return e&&(n&&e.progress(0).pause(),e.kill(),e=void 0,r(3,"removed tween (reset: "+(n?"true":"false")+")")),t}})});
	


var html = document.documentElement;
	var body = document.body;

	var scroller = {
	  target: document.querySelector(".scroll-container"),
	  ease: 0.09, // <= scroll speed
	  endY: 0,
	  y: 0,
	  resizeRequest: 1,
	  scrollRequest: 0,
	};

	var requestId = null;

	TweenLite.set(scroller.target, {
	  rotation: 0.01,
	  force3D: true
	});

	window.addEventListener("load", onLoad);

	function onLoad() {    
	  updateScroller();  
	  window.focus();
	  window.addEventListener("resize", onResize);
	  document.addEventListener("scroll", onScroll); 
	}

	function updateScroller() {
	  
	  var resized = scroller.resizeRequest > 0;
	    
	  if (resized) {    
	    var height = scroller.target.clientHeight;
	    body.style.height = height + "px";
	    scroller.resizeRequest = 0;
	  }
	      
	  var scrollY = window.pageYOffset || html.scrollTop || body.scrollTop || 0;

	  scroller.endY = scrollY;
	  scroller.y += (scrollY - scroller.y) * scroller.ease;

	  if (Math.abs(scrollY - scroller.y) < 0.05 || resized) {
	    scroller.y = scrollY;
	    scroller.scrollRequest = 0;
	  }
	  
	  TweenLite.set(scroller.target, { 
	    y: -scroller.y 
	  });
	  
	  requestId = scroller.scrollRequest > 0 ? requestAnimationFrame(updateScroller) : null;
	}

	function onScroll() {
	  scroller.scrollRequest++;
	  if (!requestId) {
	    requestId = requestAnimationFrame(updateScroller);
	  }
	}

	function onResize() {
	  scroller.resizeRequest++;
	  if (!requestId) {
	    requestId = requestAnimationFrame(updateScroller);
	  }
	}	


	const controller = new ScrollMagic.Controller();

	var forEach = function(array, callback, scope) {
		for (var i = 0; i < array.length; i++) {
			callback.call(scope, i, array[i]);
		}
	};

	var myNodeList = document.querySelectorAll(".img-loader");

	forEach(myNodeList, function(index, value) {
		const tween = TweenMax.to(value, 2, { borderTopLeftRadius:"100%", borderTopRightRadius:"100%", delay:0.3, height: 0, ease: Power2.easeOut });
		
		const itemScene = new ScrollMagic.Scene({
			triggerElement: value,
			triggerHook: 0.6,
			reverse: false
		})
		.setTween(tween)
		.addTo(controller);
	});
<a href="https://ivang-design.com/" class="logo hover-target" target=”_blank”>
		<img src="https://assets.codepen.io/1462889/logo_1.svg" alt="">
	</a>

<main class="viewport">
		<div class="scroll-container">
			<div class="section over-hide full-height">	
				<div class="section-center">	
					<div class="container">
						<div class="row">
							<div class="col-12 text-center">
								<h1 class="mb-0">scroll</h1>	
							</div>
						</div>
					</div>	
				</div>			
			</div>	
			<div class="section over-hide">	
				<div class="container">
					<div class="row">
						<div class="col-lg-7 py-5">
							<div class="section over-hide img-wrap">
								<img src="https://assets.codepen.io/1462889/nature.jpg" alt="about">
								<div class="img-loader"></div>
							</div>
						</div>
					</div>
					<div class="row justify-content-end">
						<div class="col-lg-7 py-5">
							<div class="section over-hide img-wrap">
								<img src="https://assets.codepen.io/1462889/travel.jpg" alt="about">
								<div class="img-loader"></div>
							</div>
						</div>
					</div>
					<div class="row">
						<div class="col-lg-7 py-5">
							<div class="section over-hide img-wrap">
								<img src="https://assets.codepen.io/1462889/business.jpg" alt="about">
								<div class="img-loader"></div>
							</div>
						</div>
					</div>
					<div class="row justify-content-end pb-5">
						<div class="col-lg-7 py-5">
							<div class="section over-hide img-wrap">
								<img src="https://assets.codepen.io/1462889/animals.jpg" alt="about">
								<div class="img-loader"></div>
							</div>
						</div>
					</div>
				</div>	
			</div>	
		</div>	
	</main>
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@700;900&display=swap');

:root {
	font-size: 20px;
	--dark-blue: #102770;
	--white-gr: #c4c3ca;
	--yellow: #ffeba7;
}
body{
	color: var(--white-gr);
	background-color: var(--dark-blue);
	overflow-x: hidden;
}
h1{
	font-family: 'Lato', sans-serif;
	font-weight: 900;
	color: var(--yellow);
	font-size: 12vw;
}
.section {
    position: relative;
	width: 100%;
	display: block;
	z-index: 2;
}
.over-hide {
    overflow: hidden;
}
.full-height {
	height: 100vh;
}
.z-bigger {
    z-index: 10 !important;
}
.section-center {
	position: absolute;
	top: 50%;
	left: 0;
	width: 100%;
	z-index: 10;
	transform: translateY(-50%);
}
main {
    position: relative;
	width: 100%;
	display: block;
	z-index: 2;
	-webkit-transition: all 200ms linear;
	transition: all 200ms linear;
}
.viewport {
  	overflow: hidden;
  	position: fixed;
  	height: 100%;
  	width: 100%;
  	top: 0;
  	left: 0;
  	right: 0;
  	bottom: 0;
}
.scroll-container {  
  	position: absolute;  
  	width: 100%;
  	top: 0;
  	left: 0;
  	z-index: 10;
	overflow: hidden;
 	transform-style: preserve-3d;
}
.img-loader {
  	position: absolute;
  	bottom: -25%;
  	left: -25%;
  	width: 150%;
  	height: 150%;
  	background-color: var(--dark-blue);
}
.img-wrap img{
    width: 100%;
    height: auto;
    display: block;
  border-radius: 6px;
}
.logo {
	position: fixed;
	bottom: 30px;
	right: 30px;
	display: block;
	z-index: 200000;
	transition: all 250ms linear;
}
.logo img {
	height: 40px;
	width: auto;
	display: block;
	mix-blend-mode: difference;
}

本项目引用的自定义外部资源