<script type="text/javascript">
window.onscroll=function(){
var a = document.documentElement.scrollTop==0? document.body.clientHeight : document.documentElement.clientHeight;
var b = document.documentElement.scrollTop==0? document.body.scrollTop : document.documentElement.scrollTop;
var c = document.documentElement.scrollTop==0? document.body.scrollHeight : document.documentElement.scrollHeight;
if(a+b==c){
//这里可写操作代码
}
}
</script>