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<!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">
</head>
<body>
<h1>Flex 布局示例</h1>
<p>感谢阮一峰老师的教程<a target="_blank" href="http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html">http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html</a>
<br>本示例将教程上所有的布局都简单的实现了一遍，并保存GitHub上面
<br><a href="https://github.com/JailBreakC/flex-box-demo">https://github.com/JailBreakC/flex-box-demo</a></p>
<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: <flex-direction> || <flex-wrap>;
}
</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: <integer>;
}
</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: <number>; /* 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: <number>; /* 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: <length>; | 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 | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ]
}
</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>