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反弹球

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名称：

 反弹球

实例：

　
教程： <script language="JavaScript">
<!-- hide script from old browsers



//Configure the below three variables (BallSpeed from 1 to 50, larger is faster)
var ballWidth = 40;
var ballHeight = 40;
var BallSpeed = 11;

var maxBallSpeed = 50;
var xMax;
var yMax;
var xPos = 0;
var yPos = 0;
var xDir = 'right';
var yDir = 'down';
var superballRunning = true;
var tempBallSpeed;
var currentBallSrc;
var newXDir;
var newYDir;

function initializeBall() {
if (document.all) {
xMax = document.body.clientWidth
yMax = document.body.clientHeight
document.all("superball").style.visibility = "visible";
}
else if (document.layers) {
xMax = window.innerWidth;
yMax = window.innerHeight;
document.layers["superball"].visibility = "show";
}
setTimeout('moveBall()',400);
}

function moveBall() {
if (superballRunning == true) {
calculatePosition();
if (document.all) {
document.all("superball").style.left = xPos + document.body.scrollLeft;
document.all("superball").style.top = yPos + document.body.scrollTop;
}
else if (document.layers) {
document.layers["superball"].left = xPos + pageXOffset;
document.layers["superball"].top = yPos + pageYOffset;
}
setTimeout('moveBall()',30);
}
}

function calculatePosition() {
if (xDir == "right") {
if (xPos > (xMax - ballWidth - BallSpeed)) { 
xDir = "left";
}
}
else if (xDir == "left") {
if (xPos < (0 + BallSpeed)) {
xDir = "right";
}
}
if (yDir == "down") {
if (yPos > (yMax - ballHeight - BallSpeed)) {
yDir = "up";
}
}
else if (yDir == "up") {
if (yPos < (0 + BallSpeed)) {
yDir = "down";
}
}
if (xDir == "right") {
xPos = xPos + BallSpeed;
}
else if (xDir == "left") {
xPos = xPos - BallSpeed;
}
else {
xPos = xPos;
}
if (yDir == "down") {
yPos = yPos + BallSpeed;
}
else if (yDir == "up") {
yPos = yPos - BallSpeed;
}
else {
yPos = yPos;
}
}

if (document.all||document.layers)
window.onload = initializeBall;
window.onresize = new Function("window.location.reload()");

// end hiding from old browsers -->
</script>

<style type="text/css">

#superball {
position:absolute;
left:0;
top:0;
visibility:hide;
visibility:hidden;
width:40;
height:40;
}

</style>

第二步：

<span id="superball"><a href="http://go.to/hass"><img name="superballImage" src="superball.gif" height="40px" width="40px" border="0"></a></span>
说明： 　
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