判断滚动条已经滚动毕竟部 方法收集

1.window.onscroll=function()
{
//alert(document.body.clientHeight +" " + document.documentElement.clientHeight +"\n"+document.documentElement.scrollTop +" "+document.body.scrollTop);
if(Math.abs(document.body.clientHeight - document.documentElement.clientHeight) <= (document.documentElement.scrollTop || document.body.scrollTop)){
alert("滚到底部");
}
}

?

2.

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html xmlns ="http://www.w3.org/1999/xhtml" >
< head >
??? < title ></ title >
??? < script src ="../demo/jquery-1.3.2.min.js" type ="text/javascript" ></ script >
</ head >
< body style ="height:2800px;" >
*DIV开始固定在一个位置，当下拉条下拉的高度超过这个DIV 1px的时候，这个DIV变浮动*
< div id ="top" style ="position:fixed; top:50px; left:50px;" >
???
</ div >
< div id ="pan" style ="width:160px; height:300px; border:dashed 1px black; position:absolute; right:0px; top:300px;" >
???
</ div >
< script type ="text/javascript" >
??? $(document).ready( function () {
??????? window.onscroll = function () {
??????????? var t = $(document).scrollTop();
??????????? document.getElementById( " top " ).innerHTML = t;

??????????? if (t > 301 ) {
??????????????? // 当滚动条下拉到一定位置（301）时，怎么怎么地。。。。???????????????
??????????????? $( " #pan " ).css({ " position " : " fixed " , " top " : " 0 " });
??????????? }
??????????? else {
??????????????? $( " #pan " ).css({ " position " : " absolute " , " top " : " 300 " });
??????????? }

??????? }
??? });
</ script >
</ body >
</ html >

?

3.原理:做一个监听用的JS，监听对象为页面页面的所在位置，如果下标记和页面大小的高相等，就出发时间。

以上是基本原理。

< script >
??? if ( true ){
??????? jQuery( function (){
?????????? var m = window.location.search.match( / p=(\d+) / );
?????????? var curPage = m ? parseInt(m[ 1 ]) : 1 ;
?????????? var loading = false ;

?????????? jQuery( " #content " ).scroll( function (){
?????????????? if ( curPage >= 1 && ! loading && this .scrollHeight -
?????????????????????? this .scrollTop - this .offsetHeight < this .offsetHeight ) {
?????????????????? loading = true ;
?????????????????? if (( 25 * curPage) < 79346 ) {
??????????????????????? DWRUtil.setValue( " scrollStats " , 25 * (curPage + 1 ) + " of " + 79346 );
??????????????????? } else {
??????????????????????? DWRUtil.setValue( " scrollStats " , 79346 ); } $( " progressIndicator " ).style.display = " block " ;
?????????????????? jQuery.ajax({
?????????????????????? type: " GET " ,
?????????????????????? dataType: " html " ,
?????????????????????? url: window.location + (window.location.search != '' ? " & " : " ? " ) + " type=html&p= " + ( ++ curPage ),
?????????????????????? success: function ( html ){
?????????????????????????? html = jQuery.trim( html );

?????????????????????????? if ( html ) {
?????????????????????????????? jQuery( " #content-inner " ).append( html );
??????????????????????????????
// ???????????????????????????? }
?????????????????????????? } else
?????????????????????????????? curPage = 0 ;
?????????????????????? },
?????????????????????? complete: function (){
?????????????????????????? loading = false ;
// ???????????????????????? alert(window.location.pathname + (window.location.search != '' ? ""+ window.location.search +"&" : "?") + "p=" + ( curPage ))
?????????????????????????? pageTracker._trackPageview(window.location.pathname + (window.location.search != '' ? "" + window.location.search + " & " : " ? " ) + " p= " + ( curPage ));
?????????????????????????? _qacct = " p-ebK_XdQH1HeLo " ; quantserve();
?????????????????????????? $( " progressIndicator " ).style.display = " none " ;
?????????????????????? }
?????????????????? });
?????????????? }
?????????? });
??????? });
??? }
</ script >