这个其实我也没有很明白，写的比较粗糙。

说一下步骤：

1.在界面上放上几排的div，要求做成卡片网格布局。

2.每一个卡片年内放置一个div，写文字或者其他都可以，要求不设置高度使用position: absolute; inset: 1px;将元素撑开铺满外层card。

3.在卡片上设置一个伪类before，将这个类设置在卡片和内容div之间，将其后期使用js移动变成边框

 

<template>
    <div class="mainrouter">
        <div class="test" @mouseover="handleMouse">
            <div class="card">
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
            </div>
            <div class="card">
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
            </div>
            <div class="card">
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
            </div>
            <div class="card">
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
                <div class="box-card">
                    <div class="box-text">wuiuadiuiaudhu</div>
                </div>
            </div>
        </div>
    </div>
</template>
<script setup>
import { ref } from 'vue';
const cards = document.getElementsByClassName('box-card');
const handleMouse = (e) => {
    for (const card of cards) {
        // 获取card的位置信息
        const rect = card.getBoundingClientRect();
        // console.log(rect);
        const x = e.clientX - rect.left;
        const y = e.clientY - rect. top;
        card.style.setProperty('--x', `${x}px`);
        card.style.setProperty('--y', `${y}px`);
        // console.log(card);
    }
}
</script>
<style lang="scss">
.test {
    width: 50%;
    height: 300px;
    background: black;

    &:hover {}

    .card {
        display: flex;
        width: 100%;

        .box-card {
            margin: 1px;
            width: 25%;
            height: 70px;
            border-radius: 4px;
            background: rgba($color: white, $alpha: 0.1);
            // 卡片背景移动出去不看见
            overflow: hidden;
            // 铺满整个box-card卡片
            position: relative;

            .box-text {
                position: absolute;
                inset: 1px;
                background: rgba($color: #313131, $alpha: 1.0);
                text-align: center;
                // 继承父元素
                border-radius: inherit;
                color: white;
                z-index: 3;
            }
        }

        // 添加css伪元素
        .box-card::before {
            content: '';
            position: absolute;
            z-index: 2;
            inset: 0;
            top: 0;
            left: 0;
            border-radius: inherit;
            // 渐变
            background:white;
                // radial-gradient(circle,
                //     rgba($color: white, $alpha: 1.0) 0%, transparent);
            transform: translate(var(--x, -1000px), var(--y, 1000px));
        }

        ;

    }

}
</style>