在图片上出现白光条并划过，无限循环的模式。
但是有强迫症的站长注意啦，扫的你头晕眼花 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>LOGO扫光效果</title>
<meta name="keywords" content="">
<meta name="description" content="">
<style>
.logo{
width:200px;
height:70px;
display: flex;
line-height: 70px;
position: relative;
overflow: hidden;
}
.logo img{
width:100%;
height:70px;
}
/**根据logo外div样式名称修改before前名称**/
.logo:before{
content:"";
position: absolute;
left: -10px; /**第一个数字参数控制扫光速度，数字越大越慢**/
top: -460px;
width: 200px;
height: 10px; /**光标的宽度，可根据实际调整**/
background-color: rgba(255,255,255,.5);
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-animation: searchLights 1s ease-in 1s infinite;
-o-animation: searchLights 1s ease-in 1s infinite;
animation: searchLights 1.5s ease-in 1s infinite;/**第一个数字参数控制扫光速度，数字越大越慢**/
}
@-webkit-keyframes searchLights {
0% { left: -80px; top: 0; }
to { left: 130px; top: 0px; }
}
@-o-keyframes searchLights {
0% { left: -80px; top: 0; }
to { left: 130px; top: 0px; }
}
@-moz-keyframes searchLights {
0% { left: -80px; top: 0; }
to { left: 130px; top: 0px; }
}
@keyframes searchLights {
0% { left: -80px; top: 0; }
to { left: 130px; top: 0px; }
}
</style>
</head>
<body>
<div class="logo">
<img src='https://pica.zhimg.com/80/v2-c2584ebb549fe87dda597e52b71c981b_720w.png'>
</div>
</body>
</html>
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