change opacity when scrolling the page

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Mon Nov 01 2021 11:31:48 GMT+0000 (Coordinated Universal Time)

function changeStickyOpacity() {
  	const sticky = document.querySelector('.sticky-bar');
    const range = 200;

    window.addEventListener('scroll', function () {

      const scrollTop = window.pageYOffset;
      const height = sticky.offsetHeight;
      const offset = height / 2;
      let calc = 1 - (scrollTop - offset + range) / range;
      header.style.cssText = `will-change: opacity; opacity: ${calc};`;

      if (calc > '1') {
        sticky.style.opacity = 0;
      } else if ( calc < '0' ) {
        sticky.style.opacity = 1;
      }
    });
  }

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change opacity when scrolling the page

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