<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
div {
width: 200px;
height: 200px;
background-color: orange;
position: absolute;
left: 200px;
top: 200px;
}
</style>
</head>
<body>
<div></div>
</body>
<script>
var div = document.querySelector('div')
document.onkeydown = function (e) {
console.log(e.keyCode);
switch (e.keyCode) {
case 37:
div.style.left = parseInt(document.defaultView.getComputedStyle(div)['left']) - 3 + 'px'
break;
case 38 :
div.style.top = parseInt(document.defaultView.getComputedStyle(div)['top']) - 3 + 'px'
break;
case 39:
div.style.left = parseInt(document.defaultView.getComputedStyle(div)['left']) + 3 + 'px'
break;
case 40:
div.style.top = parseInt(document.defaultView.getComputedStyle(div)['left']) + 3 + 'px'
break;
}
}
</script>
</html>