jQuery实现侧边栏随窗口滚动
<!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" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript">???
$(function() {
??? var $sidebar?? = $("#sidebar"),???
??????? $window??? = $(window),???
??????? offset???? = $sidebar.offset(),???
??????? topPadding = 15;???
??
??? $window.scroll(function() {???
??????? if ($window.scrollTop() > offset.top) {???
??????????? $sidebar.stop().animate({???
??????????????? marginTop: $window.scrollTop() - offset.top + topPadding???
??????????? });???
??????? } else {???
??????????? $sidebar.stop().animate({???
??????????????? marginTop: 0???
??????????? });???
??????? }???
??? });???
??
});???
</script>??
</head>
<body>
<div style="width:300px; float:left; height:2500px; background:#930;"></div>
<div id="sidebar" style="width:300px; float:right; height:500px; background:#999;"></div>
</body>
</html>
