为嘛我的图片不移动。。。。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
</head>
<body onload= "initSoccerBall(); ">
<img src= "20073315204866045.jpg " width= "200 " height= "150 " id= "soccerBall " />
</body>
<script language= "javascript ">
function initSoccerBall()
{
document.getElementById( "soccerBall ").animationTimer = setInterval( 'moveObject(document.getElementById( "soccerBall "),500,0,25) ',50);
}
function moveObject(target,destinationLeft,destinationTop,maxSpeed)
{
var currentLeft = parseInt(retrieveComputedStyle(target, "left "));
var currentTop = parseInt(retrieveComputedStyle(target, "top "));
if(isNaN(currentLeft))
{
currentLeft = 0;
}
if(isNaN(currentTop))
{
currentTop = 0;
}
if(currentLeft < destinationLeft)
{
currentLeft += maxSpeed;
if(currentLeft > destinationLeft)
{
currentLeft = destinationLeft;
}
}
else
{
currentLeft -= maxSpeed;
if (currentLeft < destinationLeft)
{
currentLeft = destinationLeft;
}
}
if(currentTop < destinationTop)
{
currentTop += maxSpeed;
if(currentTop > destinationTop)
{
currentTop = destinationTop;
}
}
else
{
currentTop -= maxSpeed
if(currentTop < destinationTop)
{
currentTop = destinationTop;
}
}
target.style.left = eval(currentLeft + "px ");
target.style.top = eval(currentTop + "px ");
if(currentLeft == destinationLeft && currentTop == destinationTop)
{
clearInterval(target.animationTimer);
}
}
function retrieveComputedStyle(target,position)
{
var num = null;
if (position == "left ")
{
num = target.offsetLeft;
}
else
{
num = target.offsetTop;
}
return num;
}
</script>
</html>
[解决办法]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
<script language= "javascript ">
function initSoccerBall()
{
document.getElementById( "soccerBall ").animationTimer = setInterval( 'doit() ',50);
}
function doit(){
moveObject(document.getElementById( "soccerBall "),500,0,25)
}
function moveObject(target,destinationLeft,destinationTop,maxSpeed)
{
var currentLeft = parseInt(retrieveComputedStyle(target, "left "));
var currentTop = parseInt(retrieveComputedStyle(target, "top "));
if(isNaN(currentLeft))
{
currentLeft = 0;
}
if(isNaN(currentTop))
{
currentTop = 0;
}
if(currentLeft < destinationLeft)
{
currentLeft += maxSpeed;
if(currentLeft > destinationLeft)
{
currentLeft = destinationLeft;
}
}
else
{
currentLeft -= maxSpeed;
if (currentLeft < destinationLeft)
{
currentLeft = destinationLeft;
}
}
if(currentTop < destinationTop)
{
currentTop += maxSpeed;
if(currentTop > destinationTop)
{
currentTop = destinationTop;
}
}
else
{
currentTop -= maxSpeed
if(currentTop < destinationTop)
{
currentTop = destinationTop;
}
}
target.style.left = parseInt(currentLeft);
target.style.top = parseInt(currentTop);
if(currentLeft == destinationLeft && currentTop == destinationTop)
{
clearInterval(target.animationTimer);
}
}
function retrieveComputedStyle(target,position)
{
var num = null;
if (position == "left ")
{
num = target.offsetLeft;
}
else
{
num = target.offsetTop;
}
return num;
}
</script>
</head>
<body onload= "initSoccerBall(); ">
<img src= "20073315204866045.jpg " width= "200 " height= "150 " id= "soccerBall " style= "position:absolute;z-index:2;left:15px;top:150px; "/>
</body>
</html>
