可拖拽的div
2019-08-20 本文已影响0人
大脸猫_2e21
<html>
<head lang="en">
<meta charset="UTF-8">
<title>拖动</title>
<style>
div{
border: 1px solid red;
position: absolute;
top: 0;
left: 0;
width: 100px;
height: 100px;
}
</style>
</head>
<body>
<div id="xxx"></div>
<script>
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 }
const x = e.clientX
const y = e.clientY
const deltaX = x - position[0] //相对于client移动的位置
const deltaY = y - position[1] //相对于client移动的位置
const left = parseInt(xxx.style.left || 0)
const top = parseInt(xxx.style.top || 0)
xxx.style.left = left + deltaX + 'px' //更新坐标位置
xxx.style.top = top + deltaY + 'px' //更新坐标位置
position = [x, y] //更新初始的client位置
})
document.addEventListener('mouseup', function (e) {
dragging = false
})
</script>
</body>
</html>``
