预览地址
代码
html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div id="xxx"></div>
</body>
</html>
css
div{
border: 1px solid red;
width: 100px;
height: 100px;
position: absolute;
left: 0;
top: 0;
}
js
var dragging = false
var position = null
xxx.addEventListener('mousedown', function(e){
dragging = true
position = [e.clientX, e.clientY]
})
document.addEventListener('mousemove', function(e){
if(!dragging){ return }
const x = e.clientX
const y = e.clientY
const deltaX = x - position[0]
const deltaY = y - position[1]
const left = parseInt(xxx.style.left || 0)
const top = parseInt(xxx.style.top || 0)
xxx.style.left = left + deltaX + 'px'
xxx.style.top = top + deltaY + 'px'
position = [x, y]
})
document.addEventListener('mouseup', function(e){
dragging = false
})
