一、骰子的布局
骰子的一面最多可以放置9個(gè)點(diǎn)流纹,下面用flex實(shí)現(xiàn)從1個(gè)點(diǎn)到9個(gè)點(diǎn)的布局糜烹。
如果不加說(shuō)明,本節(jié)的HTML模板一律如下漱凝。
<div class="box">
<span class="item"></span>
</div>
上面代碼中疮蹦,div元素是Flex容器,span元素是Flex項(xiàng)目茸炒。如果有多個(gè)項(xiàng)目愕乎,就要添加多個(gè)span元素阵苇,以此類(lèi)推。
1.1 單項(xiàng)目
首先感论,只有左上角1個(gè)點(diǎn)的情況绅项。Flex布局默認(rèn)就是首行左對(duì)齊,所以一行代碼就夠了比肄。
-
1.1.1
.box{
display: flex;
}
設(shè)置項(xiàng)目的對(duì)齊方式快耿,就能實(shí)現(xiàn)居中對(duì)齊和右對(duì)齊。
-
1.1.2
.box{
display: flex;
justify-content: flex-center;
}
-
1.1.3
.box{
display: flex;
justify-content: flex-end;
}
設(shè)置交叉軸的對(duì)齊方式
-
1.1.4
.box{
display: flex;
align-items: center;
}
-
1.1.5
.box{
display: flex;
justify-content: center;
align-items: center;
}
-
1.1.6
.box{
display: flex;
justify-content: center;
align-items: flex-end;
-
1.1.7
.box{
display: flex;
justify-content: flex-end;
align-items: flex-end;
}
1.2 雙項(xiàng)目
-
1.2.1
.box{
display: flex;
justify-content: space-between;
}
-
1.2.2
.box{
display: flex;
flex-direction: column;
justify-content: space-between;
}
-
1.2.3
.box{
display: flex;
flex-direction: column;
justify-content: space-between;
align-items: center;
}
-
1.2.4
.box{
display: flex;
flex-direction: column;
justify-content: space-between;
align-items: flex-end;
}
-
1.2.5
.box{
display: flex;
}
.item:nth-child(2){
align-self: center;
}
-
1.2.6
.box{
display: flex;
justify-content: space-between;
}
.item:nth-child(2) {
align-self: flex-end;
}
1.3 三項(xiàng)目
-
1.3.1
.box {
display: flex;
}
.item:nth-child(2) {
align-self: center;
}
.item:nth-child(3) {
align-self: flex-end;
}
1.4 四項(xiàng)目
-
1.4.1
.box {
display: flex;
flex-wrap: wrap;
justify-content: flex-end;
align-content: space-between;
}
-
1.4.2
<div class="box">
<div class="column">
<span class="item"></span>
<span class="item"></span>
</div>
<div class="column">
<span class="item"></span>
<span class="item"></span>
</div>
</div>
.box {
display: flex;
flex-wrap: wrap;
align-content: space-between;
}
.column {
flex-basis: 100%;
display: flex;
justify-content: space-between;
}
1.5 六項(xiàng)目
-
1.5.1
.box {
display: flex;
flex-wrap: wrap;
align-content: space-between;
}
-
1.5.2
.box {
display: flex;
flex-direction: column;
flex-wrap: wrap;
align-content: space-between;
}
-
1.5.3
<div class="box">
<div class="row">
<span class="item"></span>
<span class="item"></span>
<span class="item"></span>
</div>
<div class="row">
<span class="item"></span>
</div>
<div class="row">
<span class="item"></span>
<span class="item"></span>
</div>
</div>
...
<style>
.box {
display: flex;
flex-wrap: wrap;
}
.row{
flex-basis: 100%;
display:flex;
}
.row:nth-child(2){
justify-content: center;
}
.row:nth-child(3){
justify-content: space-between;
}
</style>
1.6 九項(xiàng)目
.box {
display: flex;
flex-wrap: wrap;
}
二薪前、網(wǎng)格布局
2.1 基本網(wǎng)格布局
最簡(jiǎn)單的網(wǎng)格布局润努,就是平均分布。在容器里面平均分配空間示括,跟上面的骰子很像铺浇,但是需要設(shè)置項(xiàng)目的自動(dòng)縮放。
HTML代碼如下:
<div class="Grid">
<div class="Grid-cell">...</div>
<div class="Grid-cell">...</div>
<div class="Grid-cell">...</div>
</div>
CSS代碼如下:
.Grid{
display: flex;
}
.Grid-cell{
flex: 1;
}
2.2 百分比布局
某個(gè)網(wǎng)格的寬度為固定的百分比垛膝,其余網(wǎng)格平均分配剩余的空間鳍侣。
HTML代碼如下:
<div class="Grid">
<div class="Grid-cell u-1of4">...</div>
<div class="Grid-cell">...</div>
<div class="Grid-cell u-1of3">...</div>
</div>
.Grid {
display: flex;
}
.Grid-cell {
flex: 1;
}
.Grid-cell.u-full {
flex: 0 0 100%;
}
.Grid-cell.u-1of2 {
flex: 0 0 50%;
}
.Grid-cell.u-1of3 {
flex: 0 0 33.3333%;
}
.Grid-cell.u-1of4 {
flex: 0 0 25%;
}
三、圣杯布局
圣杯布局(Holy Grail Layout)指的是一種常見(jiàn)的網(wǎng)站布局吼拥。頁(yè)面從上到下倚聚,分為三個(gè)部分:頭部(header),軀干(body)凿可,尾部惑折。其中軀干又水平分為三欄,從左到右為:導(dǎo)航枯跑、主欄惨驶、副欄。
HTML代碼如下:
<body class="HolyGrail">
<header>...</header>
<div class="HolyGrail-body">
<main class="HolyGrail-content">...</main>
<nav class="HolyGrail-nav">...</nav>
<aside class="HolyGrail-ads">...</aside>
</div>
<footer>...</footer>
</body>
CSS代碼如下:
.HolyGrail {
display: flex;
min-height: 100vh;
flex-direction: column;
}
header,
footer {
flex: 1;
}
.HolyGrail-body {
display: flex;
flex: 1;
}
.HolyGrail-content {
flex: 1;
}
.HolyGrail-nav, .HolyGrail-ads {
/* 兩個(gè)邊欄的寬度設(shè)為12em */
flex: 0 0 12em;
}
.HolyGrail-nav {
/* 導(dǎo)航放到最左邊 */
order: -1;
}
如果是小屏幕敛助,軀干的三欄自動(dòng)變?yōu)榇怪悲B加粗卜。
@media (max-width: 768px) {
.HolyGrail-body {
flex-direction: column;
flex: 1;
}
.HolyGrail-nav,
.HolyGrail-ads,
.HolyGrail-content {
flex: auto;
}
}
四、輸入框的布局
我們常常需要在輸入框的前方添加提示纳击,后方添加按鈕续扔。
HTML代碼如下:
<div class="InputAddOn">
<span class="InputAddOn-item">...</span>
<input class="InputAddOn-field">
<button class="InputAddOn-item">...</button>
</div>
CSS代碼如下:
.InputAddOn {
display: flex;
}
.InputAddOn-field {
flex: 1;
}
五、懸掛式布局
有時(shí)焕数,主欄的左側(cè)或右側(cè)纱昧,需要添加一個(gè)圖片欄。
HTML代碼如下:
<div class="Media">
<img class="Media-figure" src="" alt="">
<p class="Media-body">...</p>
</div>
CSS代碼如下:
.Media {
display: flex;
align-items: flex-start;
}
.Media-figure {
margin-right: 1em;
}
.Media-body {
flex: 1;
}
六堡赔、固定的底欄
有時(shí)砌些,頁(yè)面內(nèi)容太少,無(wú)法占滿(mǎn)一屏的高度,底欄就會(huì)抬高到頁(yè)面的中間存璃。這時(shí)可以采用Flex布局仑荐,讓底欄總是出現(xiàn)在頁(yè)面的底部。
HTML代碼:
<body class="Site">
<header>...</header>
<main class="Site-content">...</main>
<footer>...</footer>
</body>
CSS代碼:
.Site {
display: flex;
min-height: 100vh;
flex-direction: column;
}
.Site-content {
flex: 1;
}
七纵东、流式布局
每行的項(xiàng)目數(shù)固定粘招,會(huì)自動(dòng)分行。
CSS寫(xiě)法:
.parent {
width: 200px;
height: 150px;
background-color: black;
display: flex;
flex-flow: row wrap;
align-content: flex-start;
}
.child {
box-sizing: border-box;
background-color: white;
flex: 0 0 25%;
height: 50px;
border: 1px solid red;
}
本文來(lái)自阮一峰-Flex 布局教程:實(shí)例篇偎球,僅供自己學(xué)習(xí)參考整理洒扎。