就是当鼠标指向图片的时候,图片会蒙上一层半透明的黑色遮罩,遮罩上有文字,不用伪类也可以,在html中加个div什么的样式和:after一样就行了,代码如下:
<!DOCTYPE html>
<html>
<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>Document</title>
    <style>
        .imgbox{
            width:200px;
            height: 140px;
            position:relative;
            overflow: hidden;
        }
        img{
            width:100%;
        }
        .imgbox:after{
            position:absolute;
            left: 0;
            top:0;
            display: block;
            width:100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            content: attr(data-text);
            transition:all 1s ease;
            transform: translateY(-100%);
            color: #FFF;
        }
        .imgbox:hover:after{
            transform: translateY(0);
        }
    </style>
</head>
<body>
    <div data-text="我是文字">
            <img src="./2.jpg" alt="">
    </div>
</body>
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