<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#div1{
width:100px;
height:100px;
background:#ccc;
position:absolute;
left:0;
top:0;
}
</style>
</head>
<body>
<div id="div1"></div>
<script>
document.onkeydown=function(ev){
var oEve=window.event||ev;
var oDiv=document.getElementById('div1');
if(oEve.keyCode===37){
oDiv.style.left=oDiv.offsetLeft-10+'px';
}else if(oEve.keyCode===39){
oDiv.style.left=oDiv.offsetLeft+10+'px';
}
// alert(oEve.keyCode);
}
</script>
</body>
</html>