<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>ggggg</title>
<link rel="stylesheet" type="text/css" href="">
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<!--js code can be placed in any position and executed in sequence in sequence. It is usually placed between the head tags-->
<script type="text/javascript">
//Define global variables
//Ball coordinates
ballX=0;
ballY=0;
//The direction of the ball moving in the x and y axis
directX=1;
directY=1;
//The ball moves
function ballMove(){
//The ball moves
ballX+=2*directX;
ballY+=2*directY;
//Change the top and width of the ball at the same time
=ballY+'px';
=ballX+'px';
//();//offsetwidth is used to obtain the width of the element in JS, and the corresponding offsetHeight is also used.
//Judge the direction
//learInterval(i);
if(ballX+>= ||ballX<=0){
directX=-directX;
}
if(ballY+>= || ballY<=0){
directY=-directY;
}
}
//Timer
var i=setInterval("ballMove()",10);
</script>
</head>
<body>
<div style="width:400px;height:300px;border:1px solid silver;POSITION: absolute; TOP: 100px">
<div style="position:absolute;left:0px;top:0px;"><img src=""></div>
</div>
</body>
</html>