javascript實(shí)現(xiàn)小球的自由移動(dòng)代碼
用javascript實(shí)現(xiàn)小球的自由移動(dòng)是不是很神奇啊?下面小編交給大家實(shí)現(xiàn)的方法，歡迎閱讀以下代碼，更多詳情請(qǐng)關(guān)注應(yīng)屆畢業(yè)生考試網(wǎng)。
代碼如下：
<!DOCTYPE HTML PUBLIC "-/pic/pic/pic/p>
<html>
<head>
<title>javascript實(shí)現(xiàn)小球的自由移動(dòng)-www.javaweb.cc</title>
<link rel="stylesheet" type="text/css" href="">
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script type="text/javascript">
/pic/p>
/pic/p>
ballX=0;
ballY=0;
/pic/p>
directX=1;
directY=1;
/pic/p>
function ballMove(){
/pic/p>
ballX+=2*directX;
ballY+=2*directY;
/pic/p>
p2.style.top=ballY+'px';
p2.style.left=ballX+'px';
/pic/p>
/pic/p>
/pic/p>
/pic/p>
if(ballX+p2.offsetWidth>=p1.offsetWidth || ballX<=0){
directX=-directX;
}
if(ballY+p2.offsetHeight>=p1.offsetHeight || ballY<=0){
directY=-directY;
}
}
/pic/p>
var i=setInterval("ballMove()",10);
</script>
</head>
<body>
<p id="p1" style="width:400px;height:300px;border:1px solid silver;POSITION: absolute; TOP: 100px">
<p id="p2" style="position:absolute;left:0px;top:0px;">
<img src="ball.png">
</p>
</p>
</body>
</html>
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