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原理：设置图片层的总长=单张图片长度*张数；在轮播层中利用overflow只留出一张图片的显示； 通过图片层的left来显示轮播的每一张图，第一张为0，为了后面的图片显示，left的值左移为负数。 
轮播图
*{
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
a{
text-decoration: none;
}
#container{
position: relative;
width: 500px;
height: 260px;
margin: 20px auto;
overflow: hidden; /*溢出隐藏：只显示一张图片*/
}
#container .parent{
position: absolute;
width: 2500px; /*整个图片层长度：500*5=2500*/
height: 260px;
}
#container .parent li{
float: left;
width: 500px;
height: 100%;
}
#container .parent li img{
width: 100%;
height: 100%;
}
#container .btnLeft,
#container .btnRight{
width: 30px;
height: 30px;
background-color: #9E9E9E;
border-radius: 20%;
opacity: 80%;
position: absolute; /*包含块为图片显示层container*/
top: 0;
bottom: 0;
margin: auto;
font-size: 20px;
color: #f40;
text-align: center;
line-height: 30px;
}
#container .btnLeft{
left: 10px;
}
#container .btnRight{
right: 10px;
}
#container .btnLeft:hover,
#container .btnRight:hover{
opacity: 90%;
cursor: pointer;
}
/*蒙层*/
#container .modal{
width: 100%;
height: 40px;
background: rgba(0,0,0,.3);
position: absolute;
left: 0;
bottom: 0;
line-height: 40px;
padding: 0 40px;
box-sizing: border-box;
}
#container .modal .title{
float: left;
color: #fff;
font-size: 12px;
}
#container .modal .dots{
float: right;
position: absolute;
bottom: 10px;
left: 340px;
}
#container .modal .dots li{
width: 15px;
height: 15px;
border-radius: 50%;
float: left;
/*可以使用行块盒*/
/*display: inline-block;*/
margin: 0 5px;
cursor: pointer;
}
.clearfix::after{
content: "";
display: block;
clear: both;
}
.on{
background-color: red;
}
.off{
background-color: gray;
}
;
;
轮播图
var imgShow = document.getElementsByClassName('parent')[0],
dotList = document.querySelectorAll('.dots >.clearfix > li');
var btnLeft = document.getElementsByClassName('btnLeft')[0],
btnRight = document.getElementsByClassName('btnRight')[0];
var dotLen = dotList.length,
index = 0; //轮播层的图片索引，0表示第一张
//圆点显示
function showRadius() {
for(var i = 0; i |