<!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>
#box{
width: 400px;
height: 300px;
background-color: azure;
position: absolute;
}
</style>
</head>
<body>
<div id="box"><img src="./images01.jpg" width="400px"></div>
<script>
let box=document.querySelector("#box")
box.onmousedown = function(e){
let ox = e.offsetX
let oy = e.offsetY
document.onmousemove = function(e2){
let cx = e2.clientX
let cy = e2.clientY
let dx = cx - ox
let dy = cy - oy
box.style.left=dx + "px"
box.style.top = dy + "px"
}
}
document.onmouseup = function(){
document.onmoussemove = null;
}
</script>
</body>
</html>
