轮播图样式与交互实现-优快云博客

本文链接：https://blog.youkuaiyun.com/personaas/article/details/103243343
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            width: 500px;
            height: 400px;
            margin: 0 auto;
            position: relative;
        }
        .box img {
            width: 500px;
            height: 400px;
        }
        .box p {
            width: 100%;
            position: absolute;
            bottom: 30px;
            text-align: center;
            
        }
        .pink {
            border: 10px solid pink;
        }
        p span {
            display: inline-block;
            border: 10px solid #fff;
            border-radius: 50%;
            margin-right: 10px;
        }
        .left {
            position: absolute;
            top: 45%;
            left: 0px;
            width: 30px;
            height: 50px;
            line-height: 50px;
            color: #fff;
            font-size: 28px;
            background-color: rgba(0, 0, 0, .3);
            cursor: pointer;
        }

        .right {
            position: absolute;
            top: 45%;
            right: 0px;
            width: 30px;
            height: 50px;
            line-height: 50px;
            font-size: 28px;
            color: #fff;
            background-color: rgba(0, 0, 0, .3);
            cursor: pointer;
        }
        .title{
            width: 100%;
            height: 30px;
            background-color: rgba(225, 23, 01, .7);
            position: absolute;
            top: 0px;
            left: 0px;
            text-align: center;
            font-size: 20px;
            color: white;
        }
        .title2{
            width: 100%;
            height: 30px;
            background-color: rgba(225, 23, 01, .7);
            position: absolute;
            bottom: 0px;
            left: 0px;
            text-align: center;
            font-size: 20px;
            color: white;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="title"> </div>
        <div class="title2"> </div>
        <img src="./image/1.jpg" alt="">
        <div class="left" id="btnleft">
            < </div> <div class="right" id="btnright"> >
        </div>
        <p></p>
        
    </div>
    <script>
        var op = document.querySelector('p');
        var imgs = document.querySelector('img');
        var arr = ['./image/1.jpg', './image/2.jpg', './image/3.jpg', './image/4.jpg'];
        var len = arr.length;
        var str = '';
        for (var i = 0; i < len; i++) {
            str += '<span></span>'
        }
        op.innerHTML = str;
        var spans = op.getElementsByTagName('span');
        spans[0].className = 'pink';
        for (var i = 0; i < len; i++) {
            spans[i].index = i;
            spans[i].onmouseover = function () {
                for (var i = 0; i < len; i++) {
                    spans[i].className = '';
                }
                var sum=this.index+1; //this.index是从0开始的，所以要加1, 1 2 3 4
                title[0].innerHTML=sum+'/4';
                title2[0].innerHTML='帅哥'+sum;
                this.className = 'pink';
                imgs.src = arr[this.index]; //0 1 2 3 对应图片 1 2 3 4
                sums=this.index;
            }
        }
        var i=1;
        var title=document.getElementsByClassName('title');
        var title2=document.getElementsByClassName('title2');
        var btnleft=document.getElementById('btnleft');
        var btnright=document.getElementById('btnright');
        title[0].innerHTML='1/4';
        title2[0].innerHTML='帅哥1';
        btnleft.onclick = function () {
            --i;
            if (i < 1) {
                i = 4;
            }
            var sum=i;
            imgs.src = './image/' + i + '.jpg';
            title[0].innerHTML=sum+'/4';
            title2[0].innerHTML='帅哥'+sum;
            for(j=0;j<spans.length;j++){
                spans[j].className='';
            }
            spans[i-1].className = 'pink'; 
        }
        btnright.onclick = function () {
            i++;
            if (i > 4) { i = 1 }
            var sum=i;
            imgs.src = "./image/" + i + ".jpg";
            title[0].innerHTML=sum+'/4';
            title2[0].innerHTML='帅哥'+sum;
            for(j=0;j<spans.length;j++){
                spans[j].className='';
            }
            spans[i-1].className = 'pink';
        }
            setInterval(function(){
                i++;
            if (i > 4) {
                i = 1;
            }
            imgs.src = './image/' + i + '.jpg';
            for(j=0;j<spans.length;j++){
                spans[j].className='';
            }
            spans[i-1].className = 'pink';
                var sum=i;
                title[0].innerHTML=sum+'/4';
                title2[0].innerHTML='帅哥'+sum;
                
            },2000)
    </script>
</body>
</html>
轮播图js
