如何在网页中创建触摸式导航栏？在javascript中触摸移动

Question

像web.dev网站中的一个一样（在移动视图中）

我尝试过

let lastScale = 0;
backdrop.addEventListener("touchstart", e => {
  lastScale = e.touches[0].pageX;
});

backdrop.addEventListener("touchmove", e => {
  presentScale = e.touches[0].pageX - lastScale;
  if(presentScale > 0){
    nav.style.transform = `translateX(${presentScale}px)`;
  }
});

backdrop.addEventListener("touchend", e => {
  lastScale = 0;
  presentScale = 0;
});

这不能正常工作。