html部分：
1 <!-- html部分 --> 2 <!doctype html> 3 <html> 4 <head> 5 <meta charset="utf-8"> 6 <title>轮播图</title> 7 <link rel="stylesheet" type="text/css" href="css/demo06.css"/> 8 <script src="js/demo06.js"></script> 9 </head> 10 <body> 11 <div class="container"> 12 <!-- 轮播图区域 --> 13 <ul class="lbimg"> 14 <li class="on" style="background-color: #898989;">轮播图1</li> 15 <li style="background-color: #cd282b;">轮播图2</li> 16 <li style="background-color: pink;">轮播图3</li> 17 <li style="background-color: peachpuff;">轮播图4</li> 18 <li style="background-color: palegoldenrod;">轮播图5</li> 19 </ul> 20 <ol class="btn"> 21 <li class="active">第1张</li> 22 <li>第2张</li> 23 <li>第3张</li> 24 <li>第4张</li> 25 <li>第5张</li> 26 </ol> 27 </div> 28 </body> 29 </html>
css部分
1 *{
2 margin: 0;
3 padding: 0;
4 list-style: none;
5 }
6 .container{
7 width: 600px;
8 height: 400px;
9 border: 4px double #ff6633;
10 margin: 0 auto;
11 }
12
13 /* 轮播图 */
14 .lbimg li{
15 width: 100%;
16 height: 350px;
17 text-align: center;
18 line-height: 350px;
19 display: none;
20 font-size: 25px;
21 color: #ff6633;
22 }
23 .lbimg .on{
24 display: block;
25 }
26
27 .btn{
28 width: 100%;
29 height: 50px;
30 background-color: #3cbdff;
31 display: flex;
32 }
33 .btn li{
34 flex: 1;
35 color: #fff;
36 font-weight: bold;
37 line-height: 50px;
38 text-align: center;
39 font-family: "楷体";
40 cursor: pointer;
41
42 }
43 .btn .active{
44 background-color: rgba(0,0,0,0.2);
45 transition: all ease-in-out 0.25s;
46 }
javascript部分
1 window.onload=function(){
2 var lbimg=document.queryselector(".lbimg");
3 var lbimgs=lbimg.queryselectorall("li");
4 var btn=document.queryselector(".btn");
5 var btns=btn.queryselectorall("li");
6
7 for (var i = 0; i < btns.length; i++) {
8
9 btns[i].index=i;
10 btns[i].onclick=function(){
11 clearinterval(timer);
12 for (var j = 0; j < lbimgs.length; j++) {
13 lbimgs[j].classname="";
14 }
15 // 按钮颜色跟着变化
16 for(var k=0;k<btns.length;k++){
17 btns[k].classname="";
18 }
19 // 轮播同步，点击后图片的位置从点击的地方开始轮播
20 index=this.index;
21 btns[this.index].classname="active";
22 lbimgs[this.index].classname="on";
23 timer=setinterval(autoplay,1000);
24 }
25 }
26 var index=0;
27 // 自动轮播
28 index++;
29 var timer=setinterval(autoplay,1000);
30 function autoplay(){
31 for (var i = 0; i < lbimgs.length; i++) {
32 lbimgs[i].classname="";
33 }
34 for (var j = 0; j < btns.length; j++) {
35 btns[j].classname="";
36 }
37 if(index==lbimgs.length-1){
38 index=0;
39 }else{
40 index++;
41 }
42 btns[index].classname="active";
43 lbimgs[index].classname="on";
44 }
45
46 // 鼠标移动时清除定时器
47 lbimg.onmouseover=function(){
48 clearinterval(timer);
49 }
50 lbimg.onmouseout=function(){
51 timer=setinterval(autoplay,1000);
52 }
53
54 }
