<!DOCTYPE html> <html lang="en"> <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> .img { display: block; position: relative; width: 800px; height: 450px; margin: 0 auto; } .img:before { content: ""; position: absolute; width: 100px; height: 120%; top: 0; /*初始位置*/ left: -150px; overflow: hidden; /*控制背景色的渐变色*/ background: -moz-linear-gradient(left, rgba(255, 255, 255, 0)0, rgba(255, 255, 255, .2)50%, rgba(255, 255, 255, 0)100%); background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(255, 255, 255, 0)), color-stop(50%, rgba(255, 255, 255, .2)), color-stop(100%, rgba(255, 255, 255, 0))); background: -webkit-linear-gradient(left, rgba(255, 255, 255, 0)0, rgba(255, 255, 255, .2)50%, rgba(255, 255, 255, 0)100%); background: -o-linear-gradient(left, rgba(255, 255, 255, 0)0, rgba(255, 255, 255, .2)50%, rgba(255, 255, 255, 0)100%); /*控制光束倾斜度*/ -webkit-transform: skewX(-25deg); -moz-transform: skewX(-25deg) } .img:hover:before { left: 150%; transition: left 2s ease 0s; } </style> </head> <body> <a href="#" class="img"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508071812303&di=39df35e061f362e6cd1e1f432b6af0d9&imgtype=0&src=http%3A%2F%2Fwww.pp3.cn%2Fuploads%2F201505%2F2015062602.jpg" width="800"> </a> </body> </html>