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<!DOCTYPE HTML><!----><html><head><meta charset="utf-8"><title></title><style>#div1{width:100px;height:150px;background:red;position:absolute;right:0;bottom:0;}</style> <script>window.onscroll=function (){var oDiv=document.getElementById('div1');var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;//做相容startMove(document.documentElement.clientHeight-oDiv.offsetHeight+scrollTop);};var timer=null;function startMove(iTarget){var oDiv=document.getElementById('div1');clearInterval(timer);timer=setInterval(function (){var speed=(iTarget-oDiv.offsetTop)/4;speed=speed>0?Math.ceil(speed):Math.floor(speed);if(oDiv.offsetTop==iTarget){clearInterval(timer);}else{oDiv.style.top=oDiv.offsetTop+speed+'px';}},30);}</script></head><body style="height:2000px;"> <div id="div1"></div></body></html>
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