不固定宽高img在div里水平且垂直居中

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         #box{
 8             background:cadetblue;
 9             text-align:center;
10             line-height:800px;
11         }
12 
13         img{
14             vertical-align:middle;
15         }
16     </style>
17 </head>
18 <body>
19 <div id="box">
20     <img src="../img/9.jpg" alt="图片" />
21 </div>
22 </body>
23 </html>

不固定宽高img在div里水平且垂直居中

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