CSS鼠标悬浮盒子边框加载效果


<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>边框加载效果title>
    <style>
        body {
            background-color: black;
        }

        .container {
            width: 200px;
            height: 50px;
            background-color: #666;
            color: #fff;
            font-size: 24px;
            line-height: 50px;
            text-align: center;
            margin: 50px auto;
            position: relative;
            box-sizing: border-box;
        }

        /* 上边和右边 */
        .container::before {
            content: "";
            position: absolute;
            width: 0;
            height: 0;
            border-top: 5px solid rgb(225, 0, 255);
            border-right: 5px solid rgb(225, 0, 255);
            left: 0;
            top: 0;
            /* 添加移开鼠标的过渡效果 高度延时1s触发*/
            transition: width 1s linear 3s, height 1s linear 2s,opacity 0s linear 4s;
            opacity: 0;
        }

        /* 下边和左边 */
        .container::after {
            content: "";
            position: absolute;
            width: 0;
            height: 0;
            /* 注意边框位置 */
            border-bottom: 5px solid rgb(225, 0, 255);
            border-left: 5px solid rgb(225, 0, 255);
            right: 0;
            /* 小坑 此处用top的话 会向下伸长 不会向上 */
            bottom: -5px;
            /* 添加移开鼠标的过渡效果 高度延时1s触发*/
            transition: width 1s linear 1s, height 1s linear,opacity 0s linear 2s;
            opacity: 0;
        }

        /* before变化 */
        .container:hover::before {
            width: 100%;
            height: 100%;
            /* 添加过渡效果 */
            opacity: 1;
            transition: width 1s linear, height 1s linear 1s;
        }

        /* after变化 */
        .container:hover::after {
            width: 100%;
            height: 100%;
            /* 添加过渡效果 */
            opacity: 1;
            transition: width 1s linear 2s, height 1s linear 3s,opacity 0s linear 2s;
        }
    style>
head>

<body>
    <div class="container">
        <span>鼠标放上来试试span>
    div>
body>

html>

CSS鼠标悬浮盒子边框加载效果_第1张图片

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