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实现一个可以拖拽的div

2020-08-08 0条评论 1.8k次阅读 JavaScript


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>
🏷️ #拖拽

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