<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> * { margin: 0; padding:0; } a { display: block; width: 448px; height: 252px; margin: 100px; position: relative; } .mask { height: 100%; width: 100%; position: absolute; background:rgba(0,0,0,.4) url(images/arr.png) no-repeat center; top: 0; left: 0; display: none; /* 先隐藏元素 */ } /* 什么时候出来，鼠标经过a的时候a里面的mask出来 */ a:hover .mask { /* 鼠标经过了a，里面的mask显示出来,所以这里要使用后代选择器 */ display: block; } </style> </head> <body> <a href="#"> <img src="images/tudou.jpg" height="252" width="448" alt=""> <div class="mask"></div> </a> </body> </html>
效果图如下：
