终于把ScrollTrigger的滚动视差搞定了，卡了两天的滚动触发顺序问题原来是个小bug，加个refreshInterval就通了
ScrollTrigger.create({
trigger: ".box",
start: "top center",
end: "bottom top",
scrub: true,
onUpdate: self => console.log(self.progress)
});
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