/**
* JavaScript脚本实现回到页面顶部示例
* @param acceleration 速度
* @param stime 时间间隔 (毫秒)
**/
function gotoTop(acceleration,stime) {
acceleration = acceleration || 0.1;
stime = stime || 10;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
var x3 = 0;
var y3 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
var x3 = window.scrollX || 0;
var y3 = window.scrollY || 0;
// 滚动条到页面顶部的水平距离
var x = Math.max(x1, Math.max(x2, x3));
// 滚动条到页面顶部的垂直距离
var y = Math.max(y1, Math.max(y2, y3));
// 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
var speeding = 1 + acceleration;
window.scrollTo(Math.floor(x / speeding), Math.floor(y / speeding));
// 如果距离不为零, 继续调用函数
if(x > 0 || y > 0) {
var run = "gotoTop(" + acceleration + ", " + stime + ")";
window.setTimeout(run, stime);
}
}
HTML
<!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=gb2312" /> <title>带平滑效果的js返回顶部特效 - 站长素材</title> <link href="css/top.css" type="text/css" rel="stylesheet" /> <script type="text/javascript" src="js/top.js"></script> </head> <body> <h1 style="text-align:center;padding:35px;">先拖动滚动条，再查看右下角的小火箭，并点击试试</h1> <a href="#" onclick="gotoTop();return false;" class="totop"></a> <div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';"> <p>适用浏览器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. </p> <p>来源：<a href="http://sc.chinaz.com/" target="_blank">站长素材</a></p> </div> </body> </html><!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=gb2312" /> <title>带平滑效果的js返回顶部特效 - 站长素材</title> <link href="css/top.css" type="text/css" rel="stylesheet" /> <script type="text/javascript" src="js/top.js"></script> </head> <body> <h1 style="text-align:center;padding:35px;">先拖动滚动条，再查看右下角的小火箭，并点击试试</h1> <a href="#" onclick="gotoTop();return false;" class="totop"></a> <div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';"> <p>适用浏览器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. </p> <p>来源：<a href="http://sc.chinaz.com/" target="_blank">站长素材</a></p> </div> </body> </html>
Css
/* CSS Document */
*{margin:0;padding:0;list-style:none;border:none;}
body{height:2000px;background:#fafafa;}
.totop{position:fixed;right:25px;bottom:25px;display:block;width:26px;height:62px;background:url(../images/rocket.png) no-repeat 0 0;-webkit-transition: all 0.2s ease-in-out;}
.totop:hover{background:url(../images/rocket.png) no-repeat 0 -62px;}
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