如何用js控制当点击页面下面一个部分时让它跳到页面最上面显示啊
展开全部
<!DOCTYPE HTML>
<html>
<head>
<meta charset=UTF-8>
<title>SCROLL</title>
<style type="text/css">
</style>
<script type="text/javascript">
var goToWhere = function (where)
{
var me = this;
clearInterval (me.interval);
me.site = [];
var dom = !/.*chrome.*/i.test (navigator.userAgent) ? document.documentElement : document.body;
var height = !!where ? dom.scrollHeight : 0;
me.interval = setInterval (function ()
{
var speed = (height - dom.scrollTop) / 16;
if (speed == me.site[0])
{
clearInterval (me.interval);
return null;
}
dom.scrollTop += speed;
me.site.unshift (speed);
}, 16);
};
</script>
</head>
<body>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">5</div>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">4</div>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">3</div>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">2</div>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">1</div>
<div style="height: 1000px; text-align: center; font-size: 200px; font-weight: bold;">0</div>
<div id="back-up" onclick="goToWhere(0)"
style="border: 1px solid red; height: 100px; width: 15px; position: fixed; cursor: pointer; right: 10px; bottom: 150px;">返回顶部</div>
<div id="back-up" onclick="goToWhere(1)"
style="border: 1px solid red; height: 100px; width: 15px; position: fixed; cursor: pointer; right: 10px; bottom: 30px;">返回底部</div>
</body>
</html>
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