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：
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<!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:;" ></a> <a href="javascript:;" ></a> <a href="javascript:;" ></a> <a href="javascript:;" ></a> <a href="javascript:;" ></a> <a href="javascript:;" ></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服务器之家。
原文链接：https://blog.csdn.net/qq_46601555/article/details/110880707
