案例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
position: relative;
left: 0;
100px;
height: 100px;
background-color: pink;
}
</style>
</head>
<body>
<div></div>
<script>
var div = document.querySelector('div');
// 手指的初始坐标
var startX = 0;
var startY = 0;
// 盒子的初始位置
var x = 0;
var y = 0;
div.addEventListener('touchstart', function(e) {
startX = e.targetTouches[0].pageX;
startY = e.targetTouches[0].pageY;
x = this.offsetLeft;
y = this.offsetTop;
});
div.addEventListener('touchmove', function(e) {
// 计算手指的移动距离
var moveX = e.targetTouches[0].pageX - startX;
var moveY = e.targetTouches[0].pageY - startY;
// 移动盒子 盒子原来的位置 + 手指移动的距离
this.style.left = x + moveX + 'px';
this.style.top = y + moveY + 'px';
// 阻止屏幕滚动的默认行为
e.preventDefault();
});
</script>
</body>
</html>