我們在打開網頁的時候，我們會發現不管是什麼網頁都會有很多漂浮的廣告，有很多人都會在想，這樣的效果是怎麼實現的呢？今天我們就帶大家詳細介紹下JavaScript實作漂浮廣告程式碼的實例總結！
第一種 漂浮廣告 不符合W3C
JavaScript漂浮廣告程式碼，很不錯，程式碼精簡，不過一次只有漂一個，複製就能用了。希望站長朋友喜歡。
<html>
<head>
<title>漂浮广告</title>
<body>
<div id="codefans_net" style="position:absolute">
<!--链接地址--><a href="#" target="_blank">
<!--图片地址--><img src="/images/logo.gif" border="0">
</a>
</div>
<script>
var x = 50,y = 60
var xin = true, yin = true
var step = 1
var delay = 10
var obj=document.getElementById("codefans_net")
function float() {
var L=T=0
var R= document.body.clientWidth-obj.offsetWidth
var B = document.body.clientHeight-obj.offsetHeight
obj.style.left = x + document.body.scrollLeft
obj.style.top = y + document.body.scrollTop
x = x + step*(xin?1:-1)
if (x < L) { xin = true; x = L}
if (x > R){ xin = false; x = R}
y = y + step*(yin?1:-1)
if (y < T) { yin = true; y = T }
if (y > B) { yin = false; y = B }
}
var itl= setInterval("float()", delay)
obj.onmouseover=function(){clearInterval(itl)}
obj.onmouseout=function(){itl=setInterval("float()", delay)}
</script>
</body>
</html>第二種漂浮廣告不符合標準
Js漂浮廣告代碼，比較經典的浮動廣告，到現還很實用，如果你是一位站長的話，這種程式碼是必備的，希望對你有用。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>漂浮广告</title>
</head>
<body>
<DIV id=img1 style="Z-INDEX: 100; LEFT: 2px; WIDTH: 59px; POSITION: absolute; TOP: 43px; HEIGHT: 61px;
visibility: visible;"><a href="http://sc.jb51.net" target="_blank"><img src="/images/logo.gif" width="80" height="80" border="0"></a></DIV>
<SCRIPT>
var xPos = 300;
var yPos = 200;
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;
img1.style.top = yPos;
function changePos()
{
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = img1.offsetHeight;
Woffset = img1.offsetWidth;
img1.style.left = xPos + document.body.scrollLeft;
img1.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()
{
img1.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume()
{
if(pause)
{
clearInterval(interval);
pause = false;}
else
{
interval = setInterval('changePos()',delay);
pause = true;
}
}
start();
</SCRIPT>
</body>
</html>上面兩個都是不支援標準宣告的
第三種符合W3C的漂浮廣告程式碼
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>符合W3C的漂浮广告代码-脚本之家</title>
</head>
<body>
<script>
document.write ("<DIV id=img1 style='Z-INDEX: 100; LEFT: 2px; WIDTH: 252px; POSITION: absolute; TOP: 43px; HEIGHT: 172px; ")
document.write (" visibility: visible;'> ")
document.write (" <a href='http://s.jb51.net' target='_blank'> ")
document.write (" <img src='/upload/201204/20120411210123566.gif'style=border:none;/> ")
document.write (" </a></DIV> ")
var xPos = 300;
var yPos = 200;
var step = 1;
var delay = 8;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img1.style.top = yPos;
function changePos()
{
width = document.documentElement.clientWidth;
height = document.documentElement.clientHeight;
Hoffset = img1.offsetHeight;
Woffset = img1.offsetWidth;
img1.style.left = xPos + document.documentElement.scrollLeft;
img1.style.top = yPos + document.documentElement.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()
{
img1.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume()
{
if(pause)
{
clearInterval(interval);
pause = false;}
else
{
interval = setInterval('changePos()',delay);
pause = true;
}
}
start();
</script>
</body>
</html>總結：
本文介紹了JavaScript實作漂浮廣告的幾種方法，每個方法使用都不一樣，小夥伴們可以根據自己的需求在選擇適合自己的，希望對你的工作有所幫助！
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