实现一个可以拖拽的DIV
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style>
#xxx {
position: fixed;
width: 150px;
height: 150px;
background: red
}
</style>
<body>
<div id="xxx"></div>
<script type="text/javascript">
var xxx = document.getElementById('xxx')
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 === false) return null
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
})
</script>
</body>
</html>
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