用javascript做一个简单的弹球游戏，如何实现功能四、判断球是否被木板接住或落地。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
var x=10,y=10,dx=5,dy=5;
function f(){
if(x<0|| x>250) dx=-dx;
if(y<0||y>450) dy=-dy;
x+=dx;
y+=dy;
qiu.style.left= x;
qiu.style.top= y;
}
window.setInterval("f()",10);
function mubanMove(){
if(event.keyCode==37)
muban.style.pixelLeft-=20;
if(event.keyCode==39)
muban.style.pixelLeft+=20;
}
</script>
</head>
<body onkeydown="mubanMove()" onclick="a()">
<div style="width:300px;height:500px;margin:auto;border:#000 solid 1px;position:absolute;">
<img id="qiu" src="1.jpg" style="position:absolute;width:50px;height:50px"/>
<P id="gameover" style="margin:300px 100px 200px 100px;display:none">GAMEOVER</P>
<img id="muban" src="2.jpg"/ style="position:absolute;top:400px;width:70px;height:10px;">
</div>
</body>
</html>
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