Question

求网页图片飘动的效果代码

gif格式的图片在网页里面自由的飘动，我找了几个，都不能随着网页的滚动条移动而移动，我想要那种，它只在显示的区域飘动，不是整个网页区域，滚动条向上向下移动时，它也要向上向下移动的效果

Answer 1

<div id="img" style="position:absolute; left:35px; top:556px; width:120; background-color:#FFFFFF;" class="fudong">
这里面加你自己的东西
</div>
<SCRIPT LANGUAGE="JavaScript">
var xPos = 15;
var yPos = document.body.clientHeight;
var step = 1;
var delay = 30;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img.style.top = yPos;
function changePos() {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = img.offsetHeight;
Woffset = img.offsetWidth;
img.style.left = xPos + document.body.scrollLeft;
img.style.top = yPos + document.body.scrollTop;
if (yon) {
yPos = yPos + step;
}
else {
yPos = yPos - step;
}
if (yPos < 0) {
yon = 1;
yPos = 0;
}
if (yPos >= (height - Hoffset)) {
yon = 0;
yPos = (height - Hoffset);
}
if (xon) {
xPos = xPos + step;
}
else {
xPos = xPos - step;
}
if (xPos < 0) {
xon = 1;
xPos = 0;
}
if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
}
}
function start() {
img.visibility = "visible";
interval = setInterval('changePos()', delay);
}
start();
</script>