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javascript图片随滚动条置顶

2015-09-26 10:41 447 查看
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function cp(){
	var n=document.documentElement.scrollTop;
	s1.innerHTML=n;
	document.getElementById("i1").style.top=n+"px";
	setTimeout("cp();", 2);
}
onload=cp;
</script>
</head>
<body>

<img id="i1" alt="" src="ph/2.jpg" width="300" height="200" style="left:0px;top: 0px;position: absolute;">

<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<div>
<span id="s1"></span>
</div>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
</body>
</html>
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