不多说，直接贴代码了
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>无缝滚动</title>
<style type="text/css">
.wrap{
width: 500px;
height: 280px;
border: 10px red solid;
margin: 100px auto;
position: relative;
overflow: hidden;
}
.box{
width: 2500px;
height: 280px;
background-color: gray;
position: absolute;
}
.item{
width: 500px;
height: 280px;
float: left;
line-height: 280px;
font-size: 100px;
text-align: center;
color: white;
}
.item1{
background-color: pink;
}
.item2{
background-color: blue;
}
.item3{
background-color: yellow;
}
.item4{
background-color: green;
}
</style>
</head>
<body>
<div class="wrap" >
<div class="box" style="left:0;">
<div class="item item1">1</div>
<div class="item item2">2</div>
<div class="item item3">3</div>
<div class="item item4">4</div>
<div class="item item1">1</div>
</div>
</div>
</body>
<script type="text/javascript">
var wrap = document.getElementsByClassName('wrap')[0];
var box = document.getElementsByClassName('box')[0];
var moveTimer = setInterval(function(){
var boxLeft = parseInt(box.style.left);
box.style.left=boxLeft-5+"px";
if(boxLeft<=-2000){
box.style.left="0px";
}
},30);
wrap.onmouseover = function(){
clearInterval(moveTimer);
}
wrap.onmouseout = function(){
moveTimer = setInterval(function(){
var boxLeft = parseInt(box.style.left);
box.style.left=boxLeft-5+"px";
if(boxLeft<=-2000){
box.style.left="0px";
}
},30);
}
</script>
</html>
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