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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
#app {
width: 100px;
height: 100px;
background-color: red;
position: relative;
}
.drag {
background-color: yellow;
height: 20px;
cursor: all-scroll;
}
</style>
</head>
<body>
<div id="app" style="left: 0; top: 0">
<div class="drag"></div>
</div>
<script>
var lastPageX, lastPageY
var drag = document.querySelector('.drag')
drag.addEventListener(
'mousedown',
function (e) {
e.stopPropagation()
var pageX = e.pageX
var pageY = e.pageY
lastPageX = pageX
lastPageY = pageY
document.addEventListener('mousemove', documentMouseMove)
document.addEventListener('mouseup', function () {
document.removeEventListener('mousemove', documentMouseMove)
})
},
false
)
drag.addEventListener('mouseup', function (e) {
document.removeEventListener('mousemove', documentMouseMove)
})
function documentMouseMove(e) {
var pageX = e.pageX
var pageY = e.pageY
var deltaPageX = pageX - lastPageX
var deltaPageY = pageY - lastPageY
lastPageX = pageX
lastPageY = pageY
var left = parseFloat(app.style.left) + deltaPageX
var top = parseFloat(app.style.top) + deltaPageY
if (left < -8 || top < -8) {
return
}
app.style.left = left + 'px'
app.style.top = top + 'px'
}
</script>
</body>
</html>