Flex 布局示例

2018-01-02 12:00:00
admin
原创
464
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Flex 布局示例</title>
	<link rel="stylesheet" type="text/css" href="style.css">
	<style>
	body {
	padding: 20px;
	margin: 0 auto;
	background-color: #E2E2E2;
	max-width: 1024px;
	color: #595B66;
	font-family: 'Microsoft Yahei', sans-serif;
}
h1,h2,h3,h4 {
	color: #797979;
    // border-bottom: solid 1px #797979;
    padding: 5px 0;
}
h1, h2 {
    border-bottom: solid 2px #797979;
}
p {
	font-size: 15px;
    background: #797979;
    padding: 10px;
    border-radius: 5px;
    color: white;
    line-height: 2;
}
a {
	color: #FFD200;
}
.box {
	background-color: white;
	margin: 0 0 55px;
	display: flex;
	
}
.box-tall {
	height: 800px;
}
.box-item {
	width: 200px;
	height: 200px;
	line-height: 200px;
	vertical-align: middle;
	margin: 5px;
	background-color: #ffd200;
	font-size: 100px;
	color: white;
	text-align: center;
}
.item-tall {
	height: 400px;
	line-height: 400px;
}


.box-1 {
	flex-direction: row;
}

.box-2 {
	flex-direction: row;
	flex-wrap: nowrap;
}

.box-3 {
	flex-direction: row;
	flex-wrap: wrap;
}

.box-4 {
	flex-direction: row;
	flex-wrap: wrap-reverse;
}

.box-5 {
	flex-flow: row nowrap;
}

.box-6 {
	justify-content: flex-start;
}
.box-7 {
	justify-content: flex-end;
}
.box-8 {
	justify-content: center;
}
.box-9 {
	justify-content: space-between;
}
.box-10 {
	justify-content: space-around;
}

.box-11 {
	align-items: flex-start;
}
.box-12 {
	align-items: flex-end;
}
.box-13 {
	align-items: center;
}
.box-14 {
	align-items: baseline;
}
.box-14 .box-item{
	font-size: 88px;
	line-height: initial;
	text-decoration: underline;
}
.box-14 .item-tall{
	font-size: 122px;
	line-height: initial;
}
.box-15 {
	align-items: stretch;
}
.box-15 .box-item {
	height: auto;
}

.box-16 {
	flex-wrap: wrap;
	align-content: flex-start;
}
.box-17 {
	flex-wrap: wrap;
	align-content: flex-end;
}
.box-18 {
	flex-wrap: wrap;
	align-content: center;
}
.box-19 {
	flex-wrap: wrap;
	align-content: space-between
}
.box-20 {
	flex-wrap: wrap;
	align-content: space-around;
}
.box-21 {
	flex-wrap: wrap;
	align-content: stretch;
}
.box-21 .box-item {
	height: auto;
}

.box-22 .order {
	order: -1;
}
.box-item div{
	font-size: 14px;
	position: relative;
	top: -150px;
}

.box-23 .box-item{
	flex-grow: 1;
	width: auto;
}
.box-23	.grow-2 {
	flex-grow: 2;
}

.box-24 .box-item {
	width: 400px;
}
.box-24 .shrink{
	flex-shrink: 0;
}

.box-25 .box-item {
	flex-basis: 200px;
	width: 400px; // width 将失去作用
}

.box-26 {
	height: 400px;
}
.box-26 .box-item {
	align-self: flex-start;
}
.box-26 .end {
	align-self: flex-end;
}
	</style>
</head>
<body>
	<h1>Flex 布局示例</h1>
	
	<h2>容器的属性</h2>
	<h3>1、flex-direction属性</h3>
	<p>flex-direction属性决定主轴的方向(即项目的排列方向)。</p>
	<p>
		.box {
		    flex-direction: row | row-reverse | column | column-reverse;
		}
	</p>
	<div class="box box-1">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>

	<h3>2、flex-wrap属性</h3>
	<p>默认情况下,项目都排在一条线(又称"轴线")上。flex-wrap属性定义,如果一条轴线排不下,如何换行。</p>
	<p>
		.box{
		    flex-wrap: nowrap | wrap | wrap-reverse;
		}
	</p>
	<p>nowrap(默认):不换行。</p>
	<div class="box box-2">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
	</div>
	<p>wrap:换行,第一行在上方。</p>
	<div class="box box-3">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
	</div>
	<p>wrap-reverse:换行,第一行在下方。</p>
	<div class="box box-4">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
	</div>

	<h3>3、flex-flow</h3>
	<p>flex-flow属性是flex-direction属性和flex-wrap属性的简写形式,默认值为row nowrap。</p>
	<p>
		.box {
		    flex-flow: &lt;flex-direction&gt; || &lt;flex-wrap&gt;;
		}
	</p>
	<div class="box box-5">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
	</div>

	<h3>4、justify-content属性</h3>
	<p>justify-content属性定义了项目在主轴上的对齐方式。</p>
	<p>
		.box {
		    justify-content: flex-start | flex-end | center | space-between | space-around;
		}
	</p>
	<p>flex-start(默认值):左对齐</p>
	<div class="box box-6">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>
	<p>flex-end:右对齐</p>
	<div class="box box-7">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>
	<p>center: 居中</p>
	<div class="box box-8">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>
	<p>space-between:两端对齐,项目之间的间隔都相等。</p>
	<div class="box box-9">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>
	<p>space-around:每个项目两侧的间隔相等。所以,项目之间的间隔比项目与边框的间隔大一倍。</p>
	<div class="box box-10">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
	</div>

	<h3>5、align-items属性</h3>
	<p>align-items属性定义项目在交叉轴上如何对齐。</p>
	<p>
		.box {
		 	align-items: flex-start | flex-end | center | baseline | stretch;
		}

	</p>
	<p>flex-start:交叉轴的起点对齐。</p>
	<div class="box box-11">
		<div class="box-item">1</div>
		<div class="box-item item-tall">2</div>
		<div class="box-item">3</div>
		<div class="box-item item-tall">4</div>
	</div>
	<p>flex-end:交叉轴的终点对齐。</p>
	<div class="box box-12">
		<div class="box-item">1</div>
		<div class="box-item item-tall">2</div>
		<div class="box-item">3</div>
		<div class="box-item item-tall">4</div>
	</div>
	<p>center:交叉轴的中点对齐。</p>
	<div class="box box-13">
		<div class="box-item">1</div>
		<div class="box-item item-tall">2</div>
		<div class="box-item">3</div>
		<div class="box-item item-tall">4</div>
	</div>
	<p>baseline: 项目的第一行文字的基线对齐。</p>
	<div class="box box-14 line">
		<div class="box-item">1</div>
		<div class="box-item item-tall">2</div>
		<div class="box-item">3</div>
		<div class="box-item item-tall">4</div>
	</div>
	<p>stretch(默认值):如果项目未设置高度或设为auto,将占满整个容器的高度。</p>
	<div class="box box-15">
		<div class="box-item">1</div>
		<div class="box-item item-tall">2</div>
		<div class="box-item">3</div>
		<div class="box-item item-tall">4</div>
	</div>

	<h3>6、align-content属性</h3>
	<p>align-content属性定义了多根轴线(多行)的对齐方式。如果项目只有一根轴线,该属性不起作用。</p>
	<p>
		.box {
		  align-content: flex-start | flex-end | center | space-between | space-around | stretch;
		}

	</p>
	<p>flex-start:交叉轴的起点对齐。</p>
	<div class="box box-tall box-16">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>
	<p>flex-end:与交叉轴的终点对齐。</p>
	<div class="box box-tall box-17">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>
	<p>center:与交叉轴的中点对齐。</p>
	<div class="box box-tall box-18">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>
	<p>space-between:与交叉轴两端对齐,轴线之间的间隔平均分布。</p>
	<div class="box box-tall box-19">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>
	<p>space-around:每根轴线两侧的间隔都相等。所以,轴线之间的间隔比轴线与边框的间隔大一倍。</p>
	<div class="box box-tall box-20">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>
	<p>stretch(默认值):轴线占满整个交叉轴。</p>
	<div class="box box-tall box-21">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item">4</div>
		<div class="box-item">5</div>
		<div class="box-item">6</div>
		<div class="box-item">7</div>
		<div class="box-item">8</div>
		<div class="box-item">9</div>
	</div>

	<h2>项目的属性</h2>
	<h3>1、order属性</h3>
	<p>order属性定义项目的排列顺序。数值越小,排列越靠前,默认为0。</p>
	<p>
		.item {
		  order: &lt;integer&gt;;
		}
	</p>
	<div class="box box-22">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
		<div class="box-item order">4 <div>(order:-1)</div></div>
	</div>

	<h3>2、flex-grow属性</h3>
	<p>flex-grow属性定义项目的放大比例,默认为0,即如果存在剩余空间,也不放大。</p>
	<p>如果所有项目的flex-grow属性都为1,则它们将等分剩余空间(如果有的话)。如果一个项目的flex-grow属性为2,其他项目都为1,则前者占据的剩余空间将比其他项多一倍。</p>
	<p>
		.item {
		  flex-grow: &lt;number&gt;; /* default 0 */
		}
	</p>
	<div class="box box-23">
		<div class="box-item grow">1 <div>flex-grow: 1</div></div>
		<div class="box-item grow grow-2">2 <div>flex-grow: 2</div></div>
		<div class="box-item grow">3 <div>flex-grow: 1</div></div>
	</div>

	<h3>3、flex-shrink</h3>
	<p>flex-shrink属性定义了项目的缩小比例,默认为1,即如果空间不足,该项目将缩小。</p>
	<p>如果所有项目的flex-shrink属性都为1,当空间不足时,都将等比例缩小。如果一个项目的flex-shrink属性为0,其他项目都为1,则空间不足时,前者不缩小。<br>负值对该属性无效。</p>
	<p>
		.item {
		    flex-shrink: &lt;number&gt;; /* default 1 */
		}
	</p>
	<div class="box box-24">
		<div class="box-item shrink">1 <div>flex-shrink: 0</div></div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
	</div>

	<h3>4、flex-basis属性</h3>
	<p>flex-basis属性定义了在分配多余空间之前,项目占据的主轴空间(main size)。浏览器根据这个属性,计算主轴是否有多余空间。它的默认值为auto,即项目的本来大小。</p>
	<p>
		.item {
		    flex-basis: &lt;length&gt;; | auto; /* default auto */
		}
	</p>
	<div class="box box-25">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item">3</div>
	</div>

	<h3>5、flex属性</h3>
	<p>flex属性是flex-grow, flex-shrink 和 flex-basis的简写,默认值为0 1 auto。后两个属性可选。</p>
	<p>该属性有两个快捷值:auto (1 1 auto) 和 none (0 0 auto)。</p>
	<p>
		.item {
		    flex: none | [ &lt;'flex-grow'&gt; &lt;'flex-shrink'&gt;? || &lt;'flex-basis'&gt; ]
		}
	</p>

	<h3>6、align-self属性</h3>
	<p>align-self属性允许单个项目有与其他项目不一样的对齐方式,可覆盖align-items属性。默认值为auto,表示继承父元素的align-items属性,如果没有父元素,则等同于stretch。</p>
	<p>
		.item {
		    align-self: auto | flex-start | flex-end | center | baseline | stretch;
		}
	</p>
	<div class="box box-26">
		<div class="box-item">1</div>
		<div class="box-item">2</div>
		<div class="box-item end">3<div>flex-end</div></div>
		<div class="box-item">4</div>
	</div>
</body>
</html>
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