js 回到顶部

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<!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回到顶部</title><script type="text/javascript" language="javascript">function goTop(acceleration, time) {acceleration = acceleration || 0.1;time = time || 16; 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 speed = 1 + acceleration;window.scrollTo(Math.floor(x / speed), Math.floor(y / speed)); // 如果距离不为零, 继续调用迭代本函数if(x > 0 || y > 0) {var invokeFunction = "goTop(" + acceleration + ", " + time + ")";window.setTimeout(invokeFunction, time);}}</script></head><body><br />Top<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><a href="#" onclick="goTop();return false;">TOP</a></body></html>