js实现简单图片轮播

<!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>图片轮播</title>
    <style>
        .wrapper {
            margin: 0;
            padding: 0;
        }

        img {
            width: 100%;
            height: auto;
        }

        ul {
            position: relative;
        }

        li {
            position: absolute;
            width: 500px;
            list-style: none;
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <ul>
            <li><img src="img/1.png"></li>
        </ul>
    </div>
    <script>
        var img = [\'1.png\', \'2.png\', \'3.png\'];  
        var i = 0;  
        var t;      
        function change() {
            clearInterval(t);
            if (i > img.length - 1) {
                i = 0;
            }
            document.images[0].src = \'img/\' + img[i];
            console.log(document.images.length)
            i++;
            t = setInterval(\'change()\', 1000);
        }
        change();
    </script>
</body>

</html>