如何實(shí)現(xiàn)CSS居中？
來(lái)源：程序員人生 發(fā)布時(shí)間：2014-10-09 04:03:19 閱讀次數(shù)：2916次
來(lái)源：http://www.ido321.com/824.html
一、水平居中
1、內(nèi)聯(lián)元素居中：相對(duì)父級(jí)塊級(jí)元素居中對(duì)齊
1: .center-children {
2: text-align: center;
3: }
2、塊級(jí)元素居中：設(shè)置margin-left和margin-right為auto讓它居中（同時(shí)還要設(shè)置width，否則它就會(huì)承滿整個(gè)容器，無(wú)法看出居中效果）
1: .center-me {
2: margin: 0 auto;
3: }
如果有很多塊級(jí)元素需要水平居中成一行，最好使用一個(gè)不同的display類型。這是一個(gè)使用inline-block和flex的例子。
演示地址：http://jsfiddle.net/Web_Code/5fvrwwk1/embedded/result/
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>
12: <main class="flex-center">
13: <div>
14: I'm an element that is block-like with my siblings and we're centered in a row.
15: </div>
16: <div>
17: 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.
18: </div>
19: <div>
20: I'm an element that is block-like with my siblings and we're centered in a row.
21: </div>
22: </main>
css:
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: }
二、垂直居中
1、內(nèi)聯(lián)元素：設(shè)置相等的上下padding，或者利用line-height
1: .link {
2: padding-top: 30px;
3: padding-bottom: 30px;
4: }
文本不會(huì)換行的情況下，可以使用line-height，讓其與height相等去對(duì)齊文本。
1: .center-text-trick {
2: height: 100px;
3: line-height: 100px;
4: white-space: nowrap;
5: }
多行的文本也可以利用上下等padding的方式也可以讓多行居中，但是如果這方法沒(méi)用，你可以讓這些文字的容器按table cell模式顯示，然后設(shè)置文字的vertical-align屬性對(duì)齊，
演示地址：http://jsfiddle.net/Web_Code/5fvrwwk1/1/embedded/result/
html:
1: <table>
2: <tr>
3: <td>
4: I'm vertically centered multiple lines of text in a real table cell.
5: </td>
6: </tr>
7: </table>
8: <div class="center-table">
9: <p>I'm vertically centered multiple lines of text in a CSS-created table layout.</p>
10: </div>
css
1: body {
2: background: #f06d06;
3: font-size: 80%;
4: }
5: table {
6: background: white;
7: width: 240px;
8: border-collapse: separate;
9: margin: 20px;
10: height: 250px;
11: }
12: table td {
13: background: black;
14: color: white;
15: padding: 20px;
16: border: 10px solid white;
17: /* default is vertical-align: middle; */
18: }
19: .center-table {
20: display: table;
21: height: 250px;
22: background: white;
23: width: 240px;
24: margin: 20px;
25: }
26: .center-table p {
27: display: table-cell;
28: margin: 0;
29: background: black;
30: color: white;
31: padding: 20px;
32: border: 10px solid white;
33: vertical-align: middle;
34: }
2、塊級(jí)元素
若元素有固定高度，可以這樣垂直居中
1: .parent {
2: position: relative;
3: }
4: .child {
5: position: absolute;
6: top: 50%;
7: height: 100px;
8: margin-top: -50px; /* 如果沒(méi)有使用: border-box; 的盒子模型則需要設(shè)置這個(gè) */
9: }
如果不知道元素高度，則這樣
1: .parent {
2: position: relative;
3: }
4: .child {
5: position: absolute;
6: top: 50%;
7: transform: translateY(-50%);
8: }
也可以使用flexbox
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