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javascript 上下banner替换具体实现

复制代码 代码如下:

<!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=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">

</script>
<script type="text/javascript">
var x=400;
function dianji(){
    document.getElementById(yincang).style.height=x+px;
    x--;
    var time=setTimeout(dianji(),10);
    if(x==200){   
    clearTimeout(time);   
    //document.body.bgColor=red;
    document.getElementById(yincang).style.display=none;
    document.getElementById(xianshi).style.display=block;

    }
    }
</script>
<script type="text/javascript">

</script>
<style type="text/css">{ display:block}</style>
</head>

<body onload="dianji()" >

<div id="yincang" style=" background:#CCC; height:400px;"></div>
<div id="xianshi" style="background:#0F0; height:200px; display:none;">fdafda</div>
<div style="background:#666; height:2000px;"></div>

</body>
</html>