<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>推箱子</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style>
#gg{
width:50px;
height:50px;
background:red;
left:0;
top:0;
position:absolute;
}
</style>
<script>
//封装一个函数获取指定id的DOM对象
function $(id){
//返回一个获取的对象
return document.getElementById(id);
} //定义变量
var x=0,y=0;
window.onload=function(){
//功能键按下触发事件
document.onkeydown=function(event){
var cold;
//判断兼容性并保存值
if(window.event){
code=window.event.keyCode;
}else{
cold=event.keyCode;
}
//判断是什么键
switch(cold){
case 37:
x-=5;
break;
case 38:
y-=5;
break;
case 39:
x+=5;
break;
case 40:
y+=5;
break;
}
//保存值
$('gg').style.left=x+'px';
$('gg').style.top=y+'px';
}
}
</script>
</head>
<body>
<div id='gg'></div>
</body>
</html>
