效果：
这样，有抖动的：
无抖动的：
实现：
1.定义一个盒子：
<body>
<div class="tu"></div>
</body>
2.基本样式，长宽背景图等等~
.tu{
width: 500px;
height: 300px;
background-image: url(8.jpg);
background-size: 100% auto;
background-repeat: no-repeat;
position: relative;
overflow: hidden;
cursor: pointer;
}
cursor: pointer;鼠标经过盒子样式为小手
3.用伪类元素做扫描线，基本样式：
.tu::after{
content: '';
position: absolute;
top: 0;
left: 0;
width: 500px;
height: 35px;
background-image: url(8.jpg);
background-size: 100% auto;
background-repeat: no-repeat;
filter: sepia(100%);
opacity: 0;
}
filter: sepia(100%); 图片发黄。
filter: invert(100%); 像X光底片。
4.实现扫描：
.tu:hover::after{
opacity: 1;
animation: move 1.8s linear infinite;
}
@keyframes move{
0%{
top: 0;
background-position: 6px 0px;
}
20%{
top: 60px;
background-position: -6px -60px;
}
40%{
top: 120px;
background-position: 6px -120px;
}
60%{
top: 180px;
background-position: -6px -180px;
}
80%{
top: 240px;
background-position: 6px -240px;
}
100%{
top: 300px;
background-position: -6px -300px;
}
}
让background-position的y轴位移刚好等于top的距离，然后x轴为0的话就不抖，有数值就会抖动。
完整代码：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body{
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background-color: rgb(0, 0, 0);
}
.tu{
width: 500px;
height: 300px;
background-image: url(8.jpg);
background-size: 100% auto;
background-repeat: no-repeat;
position: relative;
overflow: hidden;
cursor: pointer;
}
.tu::after{
content: '';
position: absolute;
top: 0;
left: 0;
width: 500px;
height: 20px;
background-image: url(8.jpg);
background-size: 100% auto;
background-repeat: no-repeat;
filter: invert(100%);
opacity: 0;
}
.tu:hover::after{
opacity: 1;
animation: move 1.8s linear infinite;
}
@keyframes move{
0%{
top: 0;
background-position: 6px 0px;
}
20%{
top: 60px;
background-position: -6px -60px;
}
40%{
top: 120px;
background-position: 6px -120px;
}
60%{
top: 180px;
background-position: -6px -180px;
}
80%{
top: 240px;
background-position: 6px -240px;
}
100%{
top: 300px;
background-position: -6px -300px;
}
}
</style>
</head>
<body>
<div class="tu"></div>
</body>
</html>
总结：
这是网上看到一外国博主的创意，然后自己也弄了一个，虽然效果是比较简单的，但也是挺好玩的~