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<body>
<div id="myDiv" >
</div>
<a href="#top" target="_self" alt="返回顶部" id="scrollUp"></a>
</body>
#scrollUp {
bottom:12px;
right: 12px;
position:fixed;
width: 50px;
height: 50px;
background: url(http://images2015.cnblogs.com/blog/326714/201512/326714-20151209104220808-1661789039.png) no-repeat;
}
<SCRIPT language="JavaScript">
var myVar；
function TopFunc(){
myVar=setInterval(EachScrollBy,10);
}
function EachScrollBy(eachHeight){
if(document.documentElement.scrollTop<=0){
clearInterval(myVar);
}else{
window.scrollBy(0,-30);
}
}
</SCRIPT>
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原文地址：http://www.cnblogs.com/Areas/p/5032130.html
