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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>flex阮一峰老师布局实现</title>
<link rel="stylesheet" href="./index.css">
</head>
<body>
<h1>阮一峰flex布局实现</h1>
<h2>容器的属性</h2>
<h3>1.flex-direction 决定项目在主轴上的排列方向</h3>
<em>flex-direction: row | row-reverse | column | column-reverse;</em>
<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 决定项目的换行方式</h3>
<em>flex-wrap: nowrap | wrap | wrap-reverse;</em>
<p>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 class="box-item">8</div>
</div>
<p>换行</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 class="box-item">8</div>
</div>
<p>逆转换行</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 class="box-item">8</div>
</div>
<h3>3.flex-flow 前两个的组合</h3>
<em>flex-flow: flex-direction flex-wrap</em>
<p>纵向换行</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 class="box-item">8</div>
</div>
<h3>4.justify-content 项目在主轴上的对齐方向</h3>
<em>justify-content: flex-start | flex-end | center | space-between | space-around</em>
<p>开始位置</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>末尾位置</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</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</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</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 在交叉轴上如何对齐</h3>
<em>align-items: flex-start | flex-end | center | baseline | stretch</em>
<p>开始位置</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>末尾位置</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</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</p>
<div class="box box-14">
<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</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>
<p>stretch <em>如果项目未设置高度或者设为auto，则会占据整个容器的高度</em></p>
<div class="box box-15">
<div class="box-item1">1</div>
<div class="box-item1">2</div>
<div class="box-item1">3</div>
<div class="box-item1">4</div>
</div>
<h3>6.align-content 在多轴线上的对齐方向</h3>
<em>align-content: flex-start | flex-end | center | space-between | space-around | stretch</em>
<p>开始位置</p>
<div class="box box-16">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<p>末尾位置</p>
<div class="box box-17">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<p>center</p>
<div class="box box-18">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<p>space-between</p>
<div class="box box-19">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<p>space-around</p>
<div class="box box-20">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<p>stretch</p>
<div class="box box-21">
<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 class="box-item">5</div>
<div class="box-item item-tall">6</div>
<div class="box-item">7</div>
<div class="box-item item-tall">8</div>
</div>
<h2>项目常用几个属性</h2>
<h3>1.order</h3>
<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>(-1)</div></div>
</div>
<h3>2.flex-grow 项目放大</h3>
<p>默认值为0,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>
<div class="box box-23">
<div class="box-item grow">1</div>
<div class="box-item grow1">2</div>
<div class="box-item grow">3</div>
</div>
<h3>2.flex-shrink 项目缩小</h3>
<p>默认值为1,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,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</p>
<div class="box box-24">
<div class="box-item shrink">1</div>
<div class="box-item shrink1">2</div>
<div class="box-item shrink">3</div>
</div>
<div class="box box-24-1">
<div class="box-item shrink1">1</div>
<div class="box-item shrink1">2</div>
<div class="box-item shrink1">3</div>
</div>
<div class="box box-24-2">
<div class="box-item shrink2">1</div>
<div class="box-item shrink">2</div>
<div class="box-item shrink">3</div>
</div>
<h3>3.flex-basis </h3>
<p>项目占据的主轴空间，在分配多余空间之前，项目占据的主轴空间，默认为auto意为占据项目本来的大小</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>4.flex</h3>
<p>是前三个的结合： flex-grow flex-shrink flex-basis.有两个常用的值 auto和none，以及本身的默认值</p>
<p>auto：1 1 auto 和none: 0 0 auto 以及本身的默认值:0 1 auto</p>
<div class="box box-26">
<div class="box-item">1</div>
<div class="box-item">2</div>
<div class="box-item">3</div>
</div>
<h3>5.align-self</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>
<div class="box box-27">
<div class="box-item">1</div>
<div class="box-item self">2</div>
<div class="box-item">3</div>
</div>
</body>
</html>