//-----------点击事件---------------

οnclick="Topfun()"

 

 

//-----------js代码---------------

<script type="text/javascript">

var four;

function Topfun(){

four=setInterval(FourscrollBy,10);

}

function FourscrollBy(eachHeight){

if(document.documentElement && document.documentElement.scrollTop) //IE

{

if(document.documentElement.scrollTop<=0){

clearInterval(four);

}else{

window.scrollBy(0,-30);

}

}else{ //Chrome不支持documentElement.scrollTop

if(document.body.scrollTop<=0){

clearInterval(four);

}else{

window.scrollBy(0,-30);

}

}

}

</script>

 

 

 

来源:http://blog.csdn.net/tc_16_zl/article/details/78684545