DIV里css如何水平居中和垂直居中

2016/8/26 8:37:10   阅读:1511    发布者:1511

水平居中:
内联元素:text-align:center;相对于父级居中显示
块级元素:margin:0 auto;但是需要同时width,否则无法看到效果
多个块级元素居中:在此想要探讨一下display:inline-block;和display:flex;
方法1:在父级上设置text-align:center;在元素上设置:display:inline-block;同时为了使文字向左显示,
设置了text-align:left;在浏览器中的显示为,子元素高度自适应,底部对齐。
方法2:在子元素上设置display:center;justify-content:center;子元素的高度一致,与元素中内容最多的高度相同。
二种方法在谷歌,火狐,360均兼容,但是第2种方法在IE10中不兼容,之前的IE版本可想也是不兼容的。
当然在此也要处理由于浮动导致离层,父级背景颜色加不上去的问题。

 1 <main class="inline-block-center">  
 2   <div>  
 3     I’m an element that is block-like with my siblings and we’re centered in a row.  
 4 </div>  
 5   <div>  
 6     I’m an element that is block-like with my siblings and we’re centered in a row.  
I have more content in me than my siblings do.  
 7 </div>  
 8   <div>  
 9     I’m an element that is block-like with my siblings and we’re centered in a row.  
10 </div>  
11 </main>
 1 <main class="flex-center">  
 2   <div>  
 3     I’m an element that is block-like with my siblings and we’re centered in a row.  
 4 </div>  
 5   <div>  
 6     I’m an element that is block-like with my siblings and we’re centered in a row.  
I have more content in me than my siblings do.  
 7 </div>  
 8   <div>  
 9     I’m an element that is block-like with my siblings and we’re centered in a row.  
10 </div>  
11 </main>

 

 1 body {  
 2   background: #f06d06;  
 3   font-size: 80%;  
 4 }  
 5 main {  
 6   background: white;  
 7   margin: 20px 0;  
 8   padding: 10px;  
 9 }  
10 main div {  
11   background: black;  
12   color: white;  
13   padding: 15px;  
14   max-width: 125px;  
15   margin: 5px;  
16 }  
17 .inline-block-center {  
18   text-align: center;  
19 }  
20 .inline-block-center div {  
21   display: inline-block;  
22   text-align: left;  
23 }  
24 .flex-center {  
25   display: flex;  
26   justify-content: center;  
27 }

垂直居中:

方法1:设置padding-top和padding-bottom的值相等
方法2:设置height和line-height的值相等
方法3:固定高度可以有一种处理方式position:absolute;top:50%;height:100px;margin-top:-50px;
如果高度不固定,也可以使用js动态获取高度来。
还有css3的一些属性,考虑到兼容性问题不在叙述。