无缝滚动+定时器

<html>
   <head>
       <meta charset="UTF-8">
           <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
       <title></title>
       <style>
           #demo {
/*background: #FFF;*/
overflow:hidden;
border: 1px dashed #CCC;
width: 830px;//width=100%；
height:150px;
}
#demo img {
border: 3px solid #F2F2F2;
}
#indemo {
float: left;
width: 400%;//越大越好
}
#demo1 {
float: left;
}
#demo2 {
float: left;
}
img{
    float: left;
    width: 320px;
    height: 150px;
}
</style>
   </head>
   <body>

<div id="demo">
<div id="indemo">
<div id="demo1">
<a href="#"><img src="img/1106628.jpg" border="0" /></a>
<a href="#"><img src="img/1106914.jpg" border="0" /></a>
<a href=""><img src="img/1111588.jpg"/>
</a>
<a href=""><img src="img/1113230.jpg"/></a>
</div>
<div id="demo2"></div>
</div>
</div>
   </body>
   <script>
var speed=10;
var tab=document.getElementById("demo");
var tab1=document.getElementById("demo1");
var tab2=document.getElementById("demo2");
tab2.innerHTML=tab1.innerHTML;

function Marquee(){
if(tab2.offsetWidth-tab.scrollLeft==0){
tab.scrollLeft=0;
}
else{
// alert(tab2.offsetWidth);alert(tab.scrollLeft)
tab.scrollLeft++;

}
}

var MyMar=setInterval(Marquee,speed);

//鼠标事件

tab.onmouseover=function() {clearInterval(MyMar)};
tab.onmouseout=function() {MyMar=setInterval
(Marquee,speed)};
</script>

</html>

注释：

tab2.offsetWidth:是指整个demo2的宽度；

tab.scrollLeft：指对象（#demo）的左边界和窗口中目前可见内容（#demo和#demo2)的最左端的距离；

无缝滚动+定时器

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