JS简单版换壁纸-CFANZ编程社区

在for循环中，注册imgs的监听事件，点击后换背景颜色即可
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        body {
            background-image: url(back1.png);
        }
        
        .baidu {
            overflow: hidden;
            margin: 100px auto;
            width: 310px;
            height: 50px;
            padding-top: 3px;
            background-color: darkgray;
        }
        
        .baidu li {
            cursor: pointer;
            float: left;
            margin: 0 1px;
        }
        
        li {
            list-style: none;
        }
        
        .baidu img {
            width: 100px;
        }
    </style>
</head>

<body>
    <ul class="baidu">
        <li><img src="back1.png" alt=""></li>
        <li><img src="back2.png" alt=""></li>
        <li><img src="back3.png" alt=""></li>
        <!-- <li><img src="back4.png" alt=""></li> -->
    </ul>
    <script>
        var imgs = document.querySelector('.baidu').querySelectorAll('img');

        for (var i = 0; i < imgs.length; i++) {
            imgs[i].onclick = function() {
                document.body.style.backgroundImage = 'url(' + this.src + ')'
            }
        }
    </script>
</body>

</html>
运行效果
在这里插入图片描述