css 图片文字居中

1.单行文字居中

2.多行文字居中

3.利用background-position:center;的图片居中

4.利用display:table-cell;属性的图片居中

 1 <!DOCTYPE html>
 2 <html>
 3 
 4 <head>
 5     <meta charset="utf-8">
 6     <meta http-equiv="X-UA-Compatible" content="IE=edge">
 7     <title>display:table-cell;垂直居中</title>
 8     <meta name="viewport" content="width=device-width, initial-scale=1">
 9     <style>
10         .pic-box {
11             display: table-cell ;
12             background: pink;
13             font-size: 0 ;
14             text-align: center;
15             height: 600px;
16             width: 600px;
17             vertical-align: middle ;
18         }
19 
20         img{
21             display: inline-block ;
22         }
23 
24     </style>
25 </head>
26 
27 <body>
28     <div class="pic-box">
29         <img src="https://img.alicdn.com/bao/uploaded/i1/742862115/O1CN01yjhiHd1RUiBD5i23h_!!742862115.jpg_300x300.jpg">
30     </div>
31 </body>
32 
33 </html>

5.利用display:inline-block;属性的图片居中

6.利用position:absolute;属性的居中

　　示例代码

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>absolute居中</title>
 8     <style>
 9         .container-box{
10             background: green ;
11             position: relative;
12             width: 600px ;
13             height: 800px ;
14         }
15         .container-seed{
16             background: pink ;
17             height: 200px ;
18             width: 200px ;
19             position: absolute ;
20             /* 
21                 先将距离顶部和左边的距离都设置成50% 
22                 再减去需要居中容器本身的一半值居中 即下方的margin 负值回去
23              */
24             top: 50% ; 
25             left: 50% ;
26             margin: -100px 0 0 -100px;
27         }
28     </style>
29 </head>
30 <body>
31         <!-- 例如容器居中 -->
32         <h1>该方法适合已知需要居中元素的大小/若不确定则需要JS辅助</h1>
33         <div class="container-box">
34             <div class="container-seed">test</div>
35         </div>
36 </body>
37 </html>

7.利用：after 伪类 + content 使无法确定大小图片居中

　　示例代码

 1 <!DOCTYPE html>
 2 <html>
 3 
 4 <head>
 5     <meta charset="utf-8">
 6     <meta http-equiv="X-UA-Compatible" content="IE=edge">
 7     <title>垂直居中</title>
 8     <meta name="viewport" content="width=device-width, initial-scale=1">
 9     <style>
10         .pic-box {
11             background: pink;
12             font-size: 0 ;
13             text-align: center;
14             height: 600px;
15             width: 600px;
16         }
17 
18         img{
19             display: inline-block ;
20             vertical-align: middle ;
21         }
22 
23         .pic-box:before{
24             display: inline-block ;
25             content: '' ;
26             overflow: hidden;
27             vertical-align: middle ;
28             height: 100%;
29             width: 0 ;
30         }
31 
32     </style>
33 </head>
34 
35 <body>
36     <div class="pic-box">
37         <img src="https://img.alicdn.com/bao/uploaded/i1/742862115/O1CN01yjhiHd1RUiBD5i23h_!!742862115.jpg_300x300.jpg">
38     </div>
39 </body>
40 
41 </html>

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