浮动div，回到顶部

<div style="height: 5000px">这是顶部</div>
<div id="FloatDIV" style="position: absolute;top: 0px; z-index:9999; background: #fff000;cursor: pointer"onclick="window.scrollTo(0,0);">回到顶部
</div><script type="text/javascript"> var MarginLeft = 10;    //浮动层离浏览器右侧的距离var MarginTop = document.body.clientHeight - 80;   //浮动层离浏览器顶部的距离(浏览器高度-div高度)var Width = 25;            //浮动层宽度var Heigth= 80;           //浮动层高度//设置浮动层宽、高function Set(){document.getElementById("FloatDIV").style.width = Width + 'px';document.getElementById("FloatDIV").style.height = Heigth + 'px';}//实时设置浮动层的位置function Move(){var b_top = window.pageYOffset  || document.documentElement.scrollTop  || document.body.scrollTop  || 0;var b_width= document.body.clientWidth;document.getElementById("FloatDIV").style.top = b_top + MarginTop + 'px';document.getElementById("FloatDIV").style.left = b_width - Width - MarginLeft + 'px';setTimeout("Move();",100);}Set();Move();</script> 

 

回到顶部