基于JavaScript实现轮播图效果

本文实例为大家分享了JavaScript实现轮播图效果的具体代码，供大家参考，具体内容如下
学习笔记（学校的课设），实现了左右切换，按指示点切换、按小图标切换和自动切换，但是还有某些功能没完善，如：切换到某张图片后，左右并没有切换到前后相应的图片。
先看实现效果：
代码仅供参考：
<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 <style>
 .div0{
 height: 100px;
    width: 100%;
    background-color:black;
    opacity:0.75;
 }
 .div1{
 background-image: url(img/bg2.png);
    height: 400px;
    width: 100%;
    
 }
 .div2{
 height: 200px;
    width: 100%;
    background-color:black;
    opacity:0.75;
    position: absolute;
    
    
 }
 .spot{
 position: absolute;
 left: 10%;
 }
 .spot_list1{
 float: left;
 border:3px solid wheat;
    transform:rotate(-30deg);
    -ms-transform:rotate(-30deg);
    -moz-transform:rotate(-30deg);
    -webkit-transform:rotate(-30deg);
    -o-transform:rotate(-30deg);
     opacity:0.5;
 }
 .spot_list2{
 float: left;
 border:3px solid wheat;
    transform:rotate(-15deg);
    -ms-transform:rotate(-15deg);
    -moz-transform:rotate(-15deg);
    -webkit-transform:rotate(-15deg);
    -o-transform:rotate(-15deg);
    opacity:0.5;
 }
 .spot_list3{
 float: left;
 border:3px solid wheat;
    transform:rotate(28deg);
    -ms-transform:rotate(28deg);
    -moz-transform:rotate(28deg);
    -webkit-transform:rotate(28deg);
    -o-transform:rotate(28deg);
    opacity:0.5;
 }
 .div1_1{
 border: 10px solid gainsboro;
 width: 830px;
 height: 300px;
 left: 10%;
 top: 10%;
 position: relative;
 overflow: hidden;
 }
 .btn {
   width: 100%;
   height: 80px;
   position: absolute;
   margin: 0 auto;
   top: 120px;
  }
  .box_big {
   position: absolute;
   height: 400px;
   vertical-align: middle

  }
  #imgList{
 list-style: none;
 position: absolute; 
 }
 
 #imgList li{
 float: left;
 margin: 0 10px;
 }
  .left_btn, .right_btn {
   width: 30px;
   height: 80px;
   background:gray;
   line-height: 90px;
   border-radius: 10px;

  }

  .left_btn {
   float: left;
  }

  .right_btn {
   float: right;
  }
  #navDiv{
  position: absolute;
 left: 300px; 
 }
 #navDiv a{
 float: left;
 width: 15px;
 height: 15px;
 border-radius:50%;
 background-color: black;
 margin: 0 10px;
 opacity: 0.5;
 filter: alpha(opacity=50); 
 }

 #navDiv a:hover{
 background-color: red;
 }
 </style>
 </head>
 <body>
 <div class="div0"></div>
 <div class="div1">
 <div class="div1_1">
 <div id="navDiv">
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
 </div>
 <div class="box_big"> 
 <ul id="imgList">
 <li><img src="img/1.jpg" id="1" ></li>
 <li><img src="img/2.jpg" id="2></li>
 <li><img src="img/3.jpg" id="3"/></li>
 <li><img src="img/4.jpg" id="4"/></li>
 <li><img src="img/5.jpg" id="5"/></li>
 <li><img src="img/6.jpg" id="6"/></li>
 </ul>
 </div> 
 
 <div class="btn">
  <div class="left_btn"><img src="img/prev.png"></div>
  <div class="right_btn"><img src="img/next.png"></div>
  </div>
 </div>
 </div>
 
 <!--小标图片-->
 <div class="div2" onmouseleave="m1()">
 <div class="spot">
 <img src="img/thumbs/1.jpg" class="spot_list1" id="spot_list1" onmouseover="mouseover(1)" onmouseout="mouseout(1)">
 <img src="img/thumbs/2.jpg" class="spot_list2" id="spot_list2" onmouseover="mouseover(2)" onmouseout="mouseout(2)">
 <img src="img/thumbs/3.jpg" class="spot_list3" id="spot_list3" onmouseover="mouseover(3)" onmouseout="mouseout(3)">
 <img src="img/thumbs/4.jpg" class="spot_list1" id="spot_list4" onmouseover="mouseover(4)" onmouseout="mouseout(4)">
 <img src="img/thumbs/5.jpg" class="spot_list2" id="spot_list5" onmouseover="mouseover(5)" onmouseout="mouseout(5)">
 <img src="img/thumbs/6.jpg" class="spot_list3" id="spot_list6" onmouseover="mouseover(6)" onmouseout="mouseout(6)">
 </div>
 </div>
 </body>
 <script>
 
 var box=document.getElementById("1");
 //var spot = document.getElementsByClassName("spot_list");
 var left_btn=document.getElementsByClassName("left_btn")[0];
 var right_btn=document.getElementsByClassName("right_btn")[0];
 var time = null;
  var count = 0;
 var ids=document.getElementsByTagName("a");
 ids[0].style.backgroundColor="red";
 var spot_list1=document.getElementById("spot_list1");
 spot_list1.setAttribute("class","spot_list3");
 spot_list1.style.opacity="0.98";
 
 //左按钮
 left_btn.onclick=function(){ 
 count--;
 if(count<1){
 count=6
 }
 box.src="img/" + count + ".jpg";
 for(var i=0;i<ids.length;i++){
 ids[i].style.backgroundColor="black";
 }
 ids[count - 1].style.backgroundColor="red";
 for(var i=1;i<=6;i++){
 var img=document.getElementById("spot_list"+i);
 if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list2");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.5";
 
 }
 }
 
 var img=document.getElementById("spot_list"+count);
  if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.98";
 }
 }
 
 //右按钮
 right_btn.onclick=function(){
 changeImg();
 }
 //
 var x=1;
 var changeImg = function(){
 x++;
 if(x > 6){
 x = 1;
 }
 box.src = "img/" + x + ".jpg";
 for(var i=0;i<ids.length;i++){
 ids[i].style.backgroundColor="black";
 }
 ids[x - 1].style.backgroundColor="red";
 for(var i=1;i<=6;i++){
 var img=document.getElementById("spot_list"+i);
 if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list2");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.5";
 
 }
 }
 
 var img=document.getElementById("spot_list"+x);
  if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.98";
 }
 }
 
 //设置计时器
 var show;
 show=setInterval(changeImg, 3000);
 
 //图片切换
 function mouseover(n){
 clearInterval(show);
 var img=document.getElementById("spot_list"+n);
 if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.98";
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.98";
 }
 box.src="img/"+n+".jpg";
 for(var i=0;i<ids.length;i++){
 ids[i].style.backgroundColor="black";
 }
 ids[n-1].style.backgroundColor="red"; 
 }
 
 for(let i=0;i<ids.length;i++){
 ids[i].onclick=function(){
 clearInterval(show);
 for(var n=0;n<ids.length;n++){
  ids[n].style.backgroundColor="black";
  }
 box.src="img/"+(i+1)+".jpg";
 ids[i].style.backgroundColor="red";
 }
 }
 
 //离开小图标时
 function mouseout(n){
 
 var img=document.getElementById("spot_list"+n);
 ids[n-1].style.backgroundColor="black"; 
 if(img.id=="spot_list1" || img.id=="spot_list4"){
 img.setAttribute("class","spot_list1");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list2" || img.id=="spot_list5"){
 img.setAttribute("class","spot_list2");
 img.style.opacity="0.5";
 
 }else if(img.id=="spot_list3" || img.id=="spot_list6"){
 img.setAttribute("class","spot_list3");
 img.style.opacity="0.5";
 
 }
 
 }
  
 function m1(){
  //启动计时器
 show=setInterval(changeImg, 3000); 
 }
 
 

 </script>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自学编程网。
编程技巧