- A+
所属分类：Web前端
代码实现：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> body { background-color: #1cee89; } div { position: absolute; left: 0; width: 100px; height: 100px; background-color: #8294ff; border-radius: 20px; } </style> </head> <body> <div></div> <script> var div = document.querySelector('div'); var startX = 0; // 获取手指初始坐标 var startY = 0; var x = 0; // 获得盒子原来的位置 var y = 0; // 手指触摸 div.addEventListener('touchstart', function(e) { // 获取手指初始坐标 startX = e.targetTouches[0].pageX; startY = e.targetTouches[0].pageY; x = this.offsetLeft; y = this.offsetTop; this.style.boxShadow = '0 0 15px rgba(0, 0, 0, .6)'; }); // 手指离开 div.addEventListener('touchend', function(e) { this.style.boxShadow = ''; }); // 手指按住移动 div.addEventListener('touchmove', function(e) { // 计算手指的移动距离：手指移动之后的坐标减去手指初始的坐标 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'; e.preventDefault(); // 阻止屏幕滚动的默认行为 }); </script> </body> </html> 
