JavaScript项目实战轮播图（手动切图）

imgarray是存储图片名的数组，大家把这个改成自己的图片名称就好
querySelector函数获取img元素，可用getElementByID代替

<!DOCTYPE html>

<head>
    <meta charset="UTF-8">
    <title>轮播图</title>
    <meta name="viewport" content="width=device-width">
    <link rel="stylesheet" href="style.css">
    <style>
        .number {
      
      
            float: left;
            margin-left: 50%;
            margin-top: 100px;
            transform: translateX(-50%);
            width: 500px;
            height: 30px;
            text-align: center;
            font-size:30px;
        }
        .box {
      
      
            width: 900px;
            height: 700px;
            float: left;
            margin-left: 50%;
            margin-top: 50px;
            transform: translateX(-50%);
            background-color: #000;
            position: relative;
            border: 10px solid #fff;
        }

        #left,
        #right {
      
      
            font-family: 'icomoon';
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: rgb(82, 87, 81, .5);
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            font-size: 30px;
            color: white;
            text-align: center;
            line-height: 50px;
            cursor: pointer;
        }
        #left{
      
      
            left: 20px;
        }
        #right{
      
      
            right: 20px;
        }
    </style>
</head>

<body style="background-color:rgba(82, 87, 81, .5)">

    <div class="number"></div>

    <div class="box">
        <img src="" alt="" width="100%" height="100%">
        <div id="left"></div>
        <div id="right"></div>
    </div>

    <script>
        window.onload = function () {
      
      
            var i = 0;
            var imgarray = ['img/0.jpg', 'img/1.jpg', 'img/2.jpg', 'img/3.jpg', 'img/4.jpg', 'img/5.jpg', 'img/6.jpg', 'img/7.jpg', 'img/8.jpg', 'img/9.jpg', 'img/10.jpg'];
            var img = document.querySelector(".box img");
            img.src = imgarray[0];

            var textNode = document.createTextNode("当前为第1张图片");
            var span = document.createElement("span");
            var div = document.querySelector(".number")
            span.appendChild(textNode);
            div.appendChild(span);

            var left=document.getElementById("left");
            var right=document.getElementById('right');


            left.onclick=function(){
      
      
                i--;
                if (i< 0) {
      
      
                    i=imgarray.length-1;
                }
                span.innerText="当前为第"+(i+1)+"张图片";
                img.src = imgarray[i];
            }
            right.onclick = function () {
      
      
                i++;
                if (i >= imgarray.length) {
      
      
                    i = 0;
                }
                span.innerText="当前为第"+(i+1)+"张图片";
                img.src = imgarray[i];
            }
            
        }
    </script>
</body>

JavaScript实战项目轮播图（自动切图）

JavaScript项目实战 轮播图（手动切图）

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