用JS操作，body元素的scrollTop
var getTop = document.getElementById("get-top");
var head = document.getElementById("head");
getTop.onclick = function () {
var time = setInterval(function () {
document.body.scrollTop = document.body.scrollTop - ;
if (document.body.scrollTop === ) {
clearInterval(time);
}
}, );
};下面不确定，网上找的没实验;
$(window).scroll(function(){
if ($(window).scrollTop()>){
$("#backTop").fadeIn();
}
else
{
$("#backTop").fadeOut();
}
});
//当点击跳转链接后，回到页面顶部位置
$("#backTop").click(function(){
$('body,html').animate({scrollTop:},);
return false;
});
});点击页面回到底部或者指定位置：
// $(window).scroll(function () {
// var scrollTop = $(this).scrollTop();
// var scrollHeight = $(document).height();
// var windowHeight = $(this).height();
// console.log(scrollTop+','+scrollHeight+','+windowHeight)
// if ((scrollTop + windowHeight) / scrollHeight > 0.99) {
// $("#callMe").css("display", 'none')
// } else {
// $("#callMe").css("display", 'block')
// }
// });
$(".order").click(function(){
var height=document.body.offsetHeight;
// $(window).scrollTop(height,3000);
$('html,body').animate({scrollTop: height}, )
})滚动到顶部：
$('.scroll_top').click(function(){$('html,body').animate({scrollTop: '0px'}, );});滚动到指定位置：
$('.scroll_a').click(function(){$('html,body').animate({scrollTop:$('.a').offset().top}, );});完整事例：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js平滑滚动到顶部、底部、指定地方</title>
<script type="text/javascript" src="http://cdn.staticfile.org/jquery/2.1.1-rc2/jquery.min.js"></script>
<style>
.box{ height:200px; width:%; background:#ccc; margin:10px ;}
.location{ position:fixed; right:; bottom:10px; width:20px; background:#FFC; padding:5px; cursor:pointer;color:#};
</style>
</head>
<body>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box a">产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍</div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box bottom"></div>
<div class="location">
<p class="scroll_top">返回顶部</p>
<p class="scroll_a">产品介绍</p>
<p class="scroll_bottom">滑到底部</p>
</div>
<script type="text/javascript">
jQuery(document).ready(function($){
$('.scroll_top').click(function(){$('html,body').animate({scrollTop: '0px'}, );});
$('.scroll_a').click(function(){$('html,body').animate({scrollTop:$('.a').offset().top}, );});
$('.scroll_bottom').click(function(){$('html,body').animate({scrollTop:$('.bottom').offset().top}, );});
});
</script>
</body>
</html>