前端ABC<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>qdabc.cn</title>
<style type="text/css">
div{
width: 200px;
height: 200px;
background-color: greenyellow;
border-radius: 50%;
position: absolute;
left: 0;
top: 0;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
<script type="text/javascript">
window.onload=function(){
var myDiv=document.getElementsByTagName("div")[0];
var dis=100;
var x=0;
var y=0;
document.onkeydown=function(event){
var tempCode=event.keyCode;
switch(tempCode){
case 37:
x-=100;
break;
case 38:
y-=100;
break;
case 39:
x+=100;
break;
case 40:
y+=100;
break;
}
myDiv.style.left=x+"px";
myDiv.style.top=y+"px";
}
}
</script>
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