DS给出的兼容移动端代码建议：

let startX;

function handleStart(e) {
  const event = e.type === 'touchstart' ? e.touches[0] : e;
  startX = event.clientX;
}

function handleMove(e) {

  const event = e.type === 'touchmove' ? e.touches[0] : e;
  const deltaX = event.clientX - startX;
  console.log(`位移：${deltaX}px`);
}

element.addEventListener('mousedown', handleStart);

element.addEventListener('mousemove', handleMove);

element.addEventListener('touchstart', handleStart);

element.addEventListener('touchmove', handleMove);