<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#div1 ul li img{
width: 200px;
height: 100px;
}
#div1{
position: relative;
width: 800px;
height: 100px;
margin:100px auto;
overflow: hidden;
}
#div1 ul{
position: absolute;
left: 0;
top: 0;
overflow: hidden;
}
#div1 ul li{
list-style: none;
width: 200px;
height: 100px;
float: left;
}
</style>
<script>
window.onload = function(){
var oDiv = document.getElementById("div1");
var oUl = oDiv.getElementsByTagName("ul")[0];
var aLi = oUl.getElementsByTagName("li");
var timer = null;
var speed;
oUl.innerHTML += oUl.innerHTML;
oUl.style.width = aLi[0].offsetWidth * aLi.length +"px";//动态改变oUl的宽度
function move(){
//因为向左走所以为ul left为负数 当走到ul长度一半的时候
if(oUl.offsetLeft<-oUl.offsetWidth/2)
{
oUl.style.left = "0";
}
//向右移动判断
if(oUl.offsetLeft > 0)
{
oUl.style.left = -oUl.offsetWidth/2+"px";
}
oUl.style.left = oUl.offsetLeft +speed +"px";
}
timer = setInterval(move,30)
//放上去暂停
oDiv.onmouseover = function(){
clearInterval(timer);
}
//离开右继续滚动
oDiv.onmouseout = function(){
timer = setInterval(move,30);
}
document.getElementsByTagName("a")[0].onclick = function(){
speed = -2;
};
document.getElementsByTagName("a")[1].onclick = function(){
speed = 2;
}
}
</script>
</head>
<body>
<a href="javascript:;">向左走</a>
<a href="javascript:;">向右走</a>
<div id="div1">
<ul>
<li><img src="img/bg1.jpg" alt="" /></li>
<li><img src="img/bg2.jpg" alt="" /></li>
<li><img src="img/bg3.jpg" alt="" /></li>
<li><img src="img/bg4.jpg" alt="" /></li>
</ul>
</div>
</body>
</html>
