<!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>无标题文档</title> <style type="text/css"> *{ margin:0px auto; padding:0px} </style> </head> <body> <div style="width:100%; height:100px; background-color:#63F"></div> <div id="menu" style="width:100%; height:50px; background-color:#F36;"></div> <input type="button" value="滚动" onclick="gun()" /> <div style="width:100%; height:1000px; background-color:#FF6"></div> </body> <script type="text/javascript"> window.onscroll = function(){ var d = document.getElementById("menu"); if(window.scrollY >= 100) { d.style.position = "fixed"; d.style.top = "0px"; } else { d.style.position = "relative"; } } function gun() { window.scrollTo(0,100); } </script> </html>
点击滚动按钮后
原文：http://www.cnblogs.com/binbinyouli123/p/6534731.html