2-21 作业代码实现情况，请老师帮忙检查一下，谢谢

来源：2-21 自由编程

呜蜩的呀

2022-08-01 20:36:34

相关代码：

<!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>
        div {
            width: 88px;
            height: 81px;
            background: url(./img/xin.png) no-repeat center;
        }

        /* 题干要求是要给嵌套的元素设置子绝父相使两个盒子重合，但是好像不设置也是重合的了？ */
        .box1 {
            /* background-color: aquamarine; */
            position: relative;
            margin: 40px auto;
        }

        .box2 {
            /* background-color: bisque; */
            position: absolute;
            top: 0;
            left: 0;

            opacity: 1;
            transform: scale(1);
            /* 调用动画 */
            animation: heartbeat .5s linear 0s infinite;
            /* infinite 和alternate是不是只写一个可以实现动画效果呢？infinite是不停止，alternate让动画循环，，循环了不就是不停止？ */
        }

        /* 定义一个子元素的透明度由1到0并且在放大的动画，并且动画使反复进行的，永不停止 */
        @keyframes heartbeat {
            from {
                opacity: 1;
                transform: scale(1);
            }
            to {
                opacity: 0;
                transform: scale(2);
            }
        }
    </style>
</head>
<body>
    <!-- 用tranform属性和opacity属性，实现一下“心动”效果 -->
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
</html>

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