如何从IOS safari中的touchmove事件检测滚动画布

document.addEventListener('touchmove', handleTouchMove, { passive: false });

function handleTouchMove(event) {
  var touch = event.touches[0];
  var x = touch.clientX;
  var y = touch.clientY;
  
  // 在这里进行滚动画布的检测和相应的处理逻辑
}

var lastX = 0;
var lastY = 0;

function handleTouchMove(event) {
  var touch = event.touches[0];
  var x = touch.clientX;
  var y = touch.clientY;
  
  var deltaX = x - lastX;
  var deltaY = y - lastY;
  
  // 根据deltaX和deltaY的值进行滚动检测和处理逻辑
  
  lastX = x;
  lastY = y;
}

var element = document.getElementById('scrollable-element');

function handleTouchMove(event) {
  var touch = event.touches[0];
  var x = touch.clientX;
  var y = touch.clientY;
  
  var deltaX = x - lastX;
  var deltaY = y - lastY;
  
  // 根据deltaX和deltaY的值进行滚动检测和处理逻辑
  
  element.scrollTop += deltaY;
  element.scrollLeft += deltaX;
  
  lastX = x;
  lastY = y;
}