js實現幻燈片輪播圖
阿新 • • 發佈：2020-08-13
本文例項為大家分享了js實現幻燈片輪播圖的具體程式碼，供大家參考，具體內容如下
1.html
選取了五張圖片 放入div中，然後是左右箭頭，以及按鈕，程式碼如下
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>輪播圖</title> <link href="../css/輪播圖.css" rel="stylesheet"> </head> <body> <div id="box"> <img src="../image/car-1.jpg"> <img src="../image/car-2.jpg"> <img src="../image/car-3.jpg"> <img src="../image/car-4.jpg"> <img src="../image/car-5.jpg"> <div class="arrow"> <a class="left" href="javacript:void(0);" ><</a> <a class="right" href="javacript:void(0);" >></a> </div> <ul class="btn"> <li class="on" slideIndex="1">1</li> <li slideIndex="2">2</li> <li slideIndex="3">3</li> <li slideIndex="4">4</li> <li slideIndex="5">5</li> </ul> </div> <script src="../js/輪播圖.js"> </script> </body> </html>
2.css給div設定居中
將所有圖片隱藏，設定箭頭和小圓點的樣式
程式碼如下
*{
margin:0;
padding:0;
text-decoration: none;
list-style: none;
}
#box{
width:800px;
height: 500px;
margin:50px auto 0px;
position: relative;
}
#box img{
width:800px;
height: 500px;
display: none;
animation:fade 3s;
}
#box .arrow{
width:800px;
height: 80px;
position: absolute;
top:50%;
margin-top: -40px;
}
#box .arrow .left,.right{
display: inline-block;
line-height: 80px;
width: 50px;
height:80px;
}
#box .arrow .left:hover{
background:rgba(0,0.8);
}
#box .arrow .right:hover{
background:rgba(0,0.8);
}
#box .arrow .right{
text-align: right;
position: absolute;
right:0;
}
#box .arrow a{
font-size: 50px;
color: #ffffff;
}
#box .btn{
position: absolute;
bottom: 10px;
left:50%;
margin-left: -98.47px;
text-align: center;
}
#box .btn li{
text-align: center;
margin:0 5px;
padding: 10px;
float:left;
background:white;
border-radius:20%;
cursor: pointer;
transition: background 2s ease;
}
#box .btn .on{
background: #000;
color:white;
}
@keyframes fade{
from{
opacity:.4;
}
to{
opacity:1;
}
}3.js部分
js設定讓當前圖片顯示display：block，其他圖片隱藏display：none；
js程式碼如下
window.onload=function () {
var left=document.getElementsByClassName("left")[0];
var right=document.getElementsByClassName("right")[0];
var btn=document.getElementsByClassName("btn")[0].getElementsByTagName("li");
var box=document.getElementById("box");
var slideIndex=1;
var index=1;
var timer;
//圖片切換函式
showSlides(slideIndex);
function showSlides(n) {
var slides=document.getElementById("box").getElementsByTagName("img");
for(var i=0;i<slides.length;i++){
slides[i].style.display="none";
btn[i].className="";
}
slides[slideIndex-1].style.display="block";
btn[slideIndex-1].className="on"
}
//箭頭切換
left.onclick=function () {
if(slideIndex>1) {
slideIndex--;
showSlides(slideIndex);
}else {
slideIndex=5;
showSlides(slideIndex);
}
}
right.onclick=function () {
if(slideIndex<5) {
slideIndex++;
showSlides(slideIndex);
}else {
slideIndex=1;
showSlides(slideIndex);
}
}
//btn切換
for(var i=0;i<btn.length;i++){
btn[i].onclick=function () {
var myslideIndex=this.getAttribute('slideIndex');
// var myindex=parseInt(this.getAttribute("index"));
slideIndex=myslideIndex;
showSlides(slideIndex);
}
}
//自動播放
function play() {
timer=setInterval(function () {
right.onclick();
},4000);
}
function stop() {
clearInterval(timer);
}
box.onmouseout=play;
box.onmouseover=stop;
play();
}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。