目前支持的是豎向與橫向滾動
http://lgyweb.com/marScroll/
現在分析下無間縫實現的基本思路（豎向例子）：
HTML結構：
複製代碼代碼如下:
<div id="marScroll">
<ul>
<li>01</li>
<li>02</li>
<li>03</li>
<li>04</li>
<li>05</li>
</ul>
</div>
CSS：
複製代碼代碼如下:
<style type="text/css">
ul,li{padding: 0;margin: 0;}
#marScroll{height: 60px;overflow: hidden;}
#marScroll li{height: 20px;line-height: 20px;font-size: 14px;}
</style>
（1）首先需要判斷裡面的內容高度ul結構是否高於外層div#marScrolll，則才進行無間縫滾動：
複製代碼代碼如下:
// 寫在匿名函數里面，防止全局變量污染
(function(){
var target = document.getElementById('marScroll'),
oUl = target.getElementsByTagName('ul')[0];
// 內容少，則直接退出此函數
if(oUl.offsetHeight<target.offsetHeight) return;
})();
（2）無間縫就是內容的無限滾動展示，那麼先需要復制裡面的內容，然後通過外層的scrollTop++屬性，用setInterval 函數進行循環執行
複製代碼代碼如下:
target.innerHTML += target.innerHTML;
/* 判斷每次滾動的距離等於第一個ul的高度時，設置scrollTop為0，然後如此的循環操作就是無間滾動了
-------------------------------------------------- -------------------------------------------*/
// 把功能函數抽離出來，方便調用
var fn = function(){
if(target.scrollTop == oUl_h){
target.scrollTop = 0;
}else{
target.scrollTop++;
}
}
// setInterval 循環
var timer = setInterval(function(){
fn();
},30);
（3）鼠標經過此內容塊時，就停止滾動
複製代碼代碼如下:
// hover
target.onmouseover = function(){
clearTimeout(timer);
}
target.onmouseout = function(){
timer = setInterval(function(){
fn();
},30);
}
例子JS總代碼：
複製代碼代碼如下:
// 寫在匿名函數里面，防止全局變量污染
(function(){
var target = document.getElementById('marScroll'),
oUl = target.getElementsByTagName('ul')[0],
oUl_h = oUl.offsetHeight;
// 內容少，則直接退出此函數
if(oUl_h<target.offsetHeight) return;
target.innerHTML += target.innerHTML;
/* 判斷每次滾動的距離等於第一個ul的高度時，設置scrollTop為0，然後如此的循環操作就是無間滾動了
-------------------------------------------------- -------------------------------------------*/
// 把功能函數抽離出來，方便調用
var fn = function(){
if(target.scrollTop == oUl_h){
target.scrollTop = 0;
}else{
target.scrollTop++;
}
}
// setInterval 循環
var timer = setInterval(function(){
fn();
},30);
// hover
target.onmouseover = function(){
clearTimeout(timer);
}
target.onmouseout = function(){
timer = setInterval(function(){
fn();
},30);
}
})();
已經完成了個簡單的豎向無間縫，為了滿足更多的需求，建議封裝成可以，豎向，橫向，多次調用的函數。
以下是個人的封裝，線上例子：
http://lgyweb.com/marScroll/
複製代碼代碼如下:
function GyMarquee(opt){
this.opt = opt;
if(!document.getElementById(this.opt.targetID)) return;
this.target = document.getElementById(this.opt.targetID);
this.dir = this.opt.dir == 'crosswise'?'crosswise':'vertical';
this.effect = this.opt.effect == 'scroll'?'scroll':'marque';
this.scrollHeight = this.opt.scrollHeight;
this.init();
}
GyMarquee.prototype = {
marquee:function(){
var _that = this,
direction = 'scrollTop',
judge = this.target.scrollHeight,
timer = null;
if(this.dir == 'crosswise'){
direction = 'scrollLeft';
judge = this.itemLen*this.opt.itemWidth;
this.targetChild.style.width = this.itemLen*this.opt.itemWidth*2 + 'px';
}
var doFn = function(){
if(_that.target[direction] == judge){
_that.target[direction] = 0;
}
_that.target[direction]++;
}
timer = setInterval(function(){
doFn();
},38);
this.target.onmouseover = function(){
if(timer) clearTimeout(timer);
}
this.target.onmouseout = function(){
timer = setInterval(function(){
doFn();
},38);
}
},
scrollDo:function(){
var can = true,
_that = this;
this.target.onmouseover=function(){can=false};
this.target.onmouseout=function(){can=true};
new function (){
var stop=_that.target.scrollTop%_that.scrollHeight==0&&!can;
if(!stop)_that.target.scrollTop==parseInt(_that.target.scrollHeight/2)?_that.target.scrollTop=0:_that.target.scrollTop++;
setTimeout(arguments.callee,_that.target.scrollTop%_that.scrollHeight?20:2500);
};
},
getByClassName:function(className,parent){
var elem = [],
node = parent != undefined&&parent.nodeType==1?parent.getElementsByTagName('*'):document.getElementsByTagName('*'),
p = new RegExp("(^|//s)"+className+"(//s|$)");
for(var n=0,i=node.length;n<i;n++){
if(p.test(node[n].className)){
elem.push(node[n]);
}
}
return elem;
},
init:function(){
var val = 0;
if(this.dir =='crosswise'&&this.effect=='marque'&&this.opt.itemName!=''){
this.itemLen = this.target.getElementsByTagName(this.opt.itemName).length;
val = this.itemLen*this.opt.itemWidth;
}else{
val = this.target.scrollHeight;
}
var holderHTML = this.target.innerHTML;
this.target.innerHTML = '<div>'+holderHTML+'</div>';
this.targetChild = this.getByClassName('J_scrollInner',this.target)[0];
var attr = this.dir == 'vertical'?'offsetHeight':'offsetWidth';
if(val>this.target[attr]){
if(this.effect == 'scroll'){
this.scrollDo();
}else{
this.marquee();
}
this.targetChild.innerHTML += this.targetChild.innerHTML;
}
}
}