也许这个例子会帮助你解决这个问题。CodePen使用了AnimeJS + ScrollMagic。
简而言之：

// Add scrollmagic controller
let controller = new ScrollMagic.Controller();

// Add timeline
let tl1 = anime.timeline({autoplay: false});

//Then add some animation ... and

//Add first scrollmagic scene
let scene1 = new ScrollMagic.Scene({
 triggerElement: "#one",
 triggerHook: 0.5,
 reverse: false
})

//Play 
// Trigger animation timeline
.on("enter", function (event) {
 tl1.play();
})
 
.addTo(controller);