移动端滑动方向判断，主要是判断利用x,y轴方向的增量，哪个轴增的快，就是哪个方向。
在touchstart中获取初始点，startX, startY;
在touchmove中获取移动点，moveX, moveY
计算两者的差 deltaX = moveX - startX; deltaY = moveY - startY;
之后累加deltaX和deltaY：
distX += Math.abs(deltaX)
distY += Math.abs(deltaY)
if (distX > distY && deltaX > 0) {
console.log(‘右滑‘)
}
if (distX > distY && deltaX < 0) {
console.log(‘左滑‘)
}
if (distX < distY && deltaY < 0) {
console.log(‘上滑‘)
}
if (distX < distY && deltaY > 0) {
console.log(‘下滑‘)
}
思路就是这样，代码如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<title>滑动方向判断</title>
<style>
#box{
width: 100%;
height: 500px;
background: orange;
}
</style>
</head>
<body>
<div id="box"></div>
<script>
let startX,startY,moveX,moveY,deltaX,deltaY;
let distX = 0
let distY = 0
let box = document.getElementById(‘box‘)
box.addEventListener(‘touchstart‘, function(e) {
let point = e.touches ? e.touches[0] : e
startX = point.pageX
startY = point.pageY
distX = 0
distY = 0
})
box.addEventListener(‘touchmove‘, function(e) {
let point = e.touches ? e.touches[0] : e
moveX = point.pageX
moveY = point.pageY
deltaX = moveX - startX
deltaY = moveY - startY
distX += Math.abs(deltaX)
distY += Math.abs(deltaY)
console.log(distX, distY)
if (distX > distY && deltaX > 0) {
console.log(‘右滑‘)
}
if (distX > distY && deltaX < 0) {
console.log(‘左滑‘)
}
if (distX < distY && deltaY < 0) {
console.log(‘上滑‘)
}
if (distX < distY && deltaY > 0) {
console.log(‘下滑‘)
}
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/lonfate/p/9157327.html