html====<html><head><meta charset="UTF-8"><title>Document</title><link rel="stylesheet" href="style/main.css"></head><body><div id="box"></div><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> </body></html><script src="js/jquery-1.11.2.js"></script><script src="js/demo.js"></script> css===*{margin: 0;padding: 0;}#box{width: 100px;height: 100px;background: red;position: absolute;right: 0;bottom: 0;}js=====window.onscroll=function () {var box=document.getElementById('box');var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;box.style.top=document.documentElement.clientHeight-box.offsetHeight+scrollTop+"px";}为什么不行？
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