实现效果：
完整代码
：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.banner {
width: 1000px;
border: 1px solid red;
margin: 0 auto;
position: relative;
/* 隐藏溢出的图片 */
overflow: hidden;
}
.item img {
width: 200px;
height: 300px;
vertical-align: top;
}
.item {
width: 200px;
height: 300px;
}
.banner .wrap {
width: 2000px;
height: 300px;
border: 1px solid green;
display: flex;
/* flex-grow: 1; */
margin-left: 0px;
}
</style>
</head>
<body>
<div class="banner">
<div class="wrap">
<div class="item">
<img src="img/1.jpg" alt="">
</div>
<div class="item">
<img src="img/2.jpg" alt="">
</div>
<div class="item">
<img src="img/3.jpg" alt="">
</div>
<div class="item">
<img src="img/4.jpg" alt="">
</div>
<div class="item">
<img src="img/5.jpg" alt="">
</div>
<!-- 添加一组相同的图片来填充空白 -->
<div class="item">
<img src="img/1.jpg" alt="">
</div>
<div class="item">
<img src="img/2.jpg" alt="">
</div>
<div class="item">
<img src="img/3.jpg" alt="">
</div>
<div class="item">
<img src="img/4.jpg" alt="">
</div>
<div class="item">
<img src="img/5.jpg" alt="">
</div>
</div>
</div>
<script>
// 无缝滚动
//移动初始量
var leftOffsetx = 0;
var wrap = document.querySelector(".wrap");
function movingImg() {
//判断要超出边界返回初始位置
if (leftOffsetx >= 1000) {
leftOffsetx = 0;
} else {
leftOffsetx++;
}
// wrap.style.transition ="margin-left 0.7s ease-in-out 0.2s"
wrap.style.marginLeft = (-leftOffsetx) + "px"
}
//添加定时器自动滚动
var t1 = setInterval("movingImg()", 10)
wrap.onmouseover = function(){
//鼠标划入停止定时器
clearInterval(t1);
}
wrap.onmouseout = function(){
//鼠标划出滚动继续
t1=setInterval("movingImg()",10);
}
</script>
</body>
</html>