<section>
  <img 
  class="logo"
  width="40"        src="https://cdn.worldvectorlogo.com/logos/gsap-greensock.svg" />
</section>

<section>
    <img 
  class="logo"
  width="40"        src="https://cdn.worldvectorlogo.com/logos/gsap-greensock.svg" />
</section>

<section>  <img 
  class="logo"
  width="40"        src="https://cdn.worldvectorlogo.com/logos/gsap-greensock.svg" /></section>

<section>  <img 
  class="logo"
  width="40"        src="https://cdn.worldvectorlogo.com/logos/gsap-greensock.svg" /></section>

* {
  padding: 0;
  margin: 0;
}
section {
  height: 100vh;
  display: flex;
  justify-content: start;
  algin-item: center
  position: relative;
}
section:nth-child(1) {
  background: lightblue;
}
section:nth-child(1)::after {
  content: '直接播放';
  position: absolute;
  opacity: .2;
  z-index: 1;
}
section:nth-child(1)::before {
  content: 'A';
  position: absolute;
  font-size: 80px;
  opacity: .2;
  height: 100vh;
  display: flex;
  align-items: center;
  z-index: 1;
}
section:nth-child(2) {
  background: lightgreen;
}
section:nth-child(2)::after {
  content: '向下進入(播放) / 向下離開 (暫停) / 向上進入 (恢復播放) / 向上離開 (倒轉)';
  position: absolute;
  opacity: .2;
  z-index: 1;
}
section:nth-child(2)::before {
  content: 'B';
  position: absolute;
  font-size: 80px;
  opacity: .2;
  height: 100vh;
  display: flex;
  align-items: center;
  z-index: 1;
}
section:nth-child(3) {
  background: pink;
}
section:nth-child(3)::after {
  content: '進入區塊後，依滾動 播放與倒轉';
  position: absolute;
  opacity: .2;
  z-index: 1;
}
section:nth-child(3)::before {
  content: 'C';
  position: absolute;
  font-size: 80px;
  opacity: .2;
  height: 100vh;
  display: flex;
  align-items: center;
  z-index: 1;
}
section:nth-child(4) {
  background: orange;
}
section:nth-child(4)::after {
  content: '進入區塊，才觸發 (播放)';
  position: absolute;
  opacity: .2;
  z-index: 1;
}
section:nth-child(4)::before {
  content: 'D';
  position: absolute;
  font-size: 80px;
  opacity: .2;
  height: 100vh;
  display: flex;
  align-items: center;
  z-index: 1;
}
img {
  z-index: 2;
}

const logo = document.querySelectorAll('.logo')
const a = logo[0]
const b = logo[1]
const c = logo[2]
const d = logo[3]
const sectionA = 'section:nth-child(1)'
const sectionB = 'section:nth-child(2)'
const sectionC = 'section:nth-child(3)'
const sectionD = 'section:nth-child(4)'

gsap.to(a, {
  duration: 5,
  xPercent: 1000,
  rotation: 360
})

gsap.to(b, {
  scrollTrigger: {
    trigger: sectionB,
    toggleActions: 'play pause resume reverse',
  },
  duration: 5,
  xPercent: 1000,
  rotation: 360
})

gsap.to(c, {
  scrollTrigger: {
    trigger: sectionC,
    scrub: true,  // 依滾動 播放/倒帶 (druation 將無效)
  },
  xPercent: 1000,
  rotation: 360
})

gsap.to(d, {
  scrollTrigger: sectionD,
  duration: 3,
  xPercent: 1000,
  rotation: 360
})