<!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>
<title>scroll Demo</title>
<style>
body
{
margin:0px;
padding:0px;
height:900px;
}
#tip
{
position:absolute;
right:0px;
width:200px;
height:200px;
border:1px solid red;
}
</style>
<script src="../js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
var tipObj = $("#tip");
var tipHeight = tipObj.height();
//可视化高度
var clientHeight = $(window).height();
var height = clientHeight-tipHeight;
//window scroll事件
$(window).scroll(function(){
//alert("window scroll事件！！！");
var scrollTop = $(this).scrollTop();
var currentHeight = (height + scrollTop)/2;
tipObj.css("top",currentHeight+"px");
}).trigger("scroll");
});
</script>
</head>
<body>
<div id="tip">
</div>
</body>
</html>
w3c scroll事件：
http://www.w3school.com.cn/tiy/t.asp?f=jquery_event_scroll
时间： 2024-08-30 10:09:58