3种方法实现列表自动滚动

　　　　//javascript原生自动滚动
function startmarquee(lh,speed,delay,marqueeObj) {  //lh---每行列表的高度，speed---滚动的速度，delay---间隔多久滚动一次,marqueeObj---需要实现这个效果的id
var p=false;
var t;
var o=document.getElementById(marqueeObj);
o.innerHTML+=o.innerHTML;
o.style.marginTop=0;
o.onmouseover=function(){p=true;} //鼠标移入，停止滚动
o.onmouseout=function(){p=false;}//鼠标移出，继续滚动

function start(){
t=setInterval(scrolling,speed); //定时器，自动滚动
if(!p) o.style.marginTop=parseInt(o.style.marginTop)-1+"px";
}

function scrolling(){
if(parseInt(o.style.marginTop)%lh!=0){
o.style.marginTop=parseInt(o.style.marginTop)-1+"px";
if(Math.abs(parseInt(o.style.marginTop))>=o.scrollHeight/2) o.style.marginTop=0;
}else{
clearInterval(t);
setTimeout(start,delay);
}
}
setTimeout(start,delay);
}
startmarquee(48,20,1000,"marqueebox"); //引用函数

　　　　　//列表自动滚动
function scrollNews() {
var $news = $('#marqueebox table');
var $lineHeight = $news.find('tr:first').height();
$news.animate({ 'marginTop': -$lineHeight + 'px' }, 1000, function () {
$news.css({ margin: 0 }).find('tr:first').appendTo($news);
});
}

var scrollTimer = null;
var delay = 2000;
scrollTimer = setInterval(function () {
scrollNews();
}, delay);

　　　　function ScrollImgLeft(start,end,wrap){
var speed=40;
var scroll_begin = document.getElementById(start);
var scroll_end = document.getElementById(end);
var scroll_div = document.getElementById(wrap);
scroll_end.innerHTML=scroll_begin.innerHTML;
function Marquee(){
if(scroll_end.offsetWidth-scroll_div.scrollLeft<=0){
scroll_div.scrollLeft-=scroll_begin.offsetWidth;
}else{
scroll_div.scrollLeft++;
}
}
var MyMar=setInterval(Marquee,speed);
scroll_div.onmouseover=function() {clearInterval(MyMar);}
scroll_div.onmouseout=function() {MyMar=setInterval(Marquee,speed);}
}