<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>单页切换</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
</head>
<body>
<script>
$(function(){
$("#control a").click(function(){
var rel=$(this).attr("href");
var pos=$(rel).offset().top;
$("html,body").animate({scrollTop:pos}, 800);
})
})
</script>
<div id="control" style="position:fixed;top:0px;">
<a href="#top">head</a><br/><a href="#center">middle</a><br/><a href="#bottom">bottom</a>
</div>
<div id="top" style="height:700px;background:#f00">
</div>
<div id="center" style="height:700px;background:#ff0">
</div>
<div id="bottom" style="height:700px;background:#0ff">
</div>
</body>
</html>