• 测试flex的各种属性

    代码测试：

    <!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>测试flex的各种属性</title>
  <style>
    body {
      padding: 20px;
      margin: 0 auto;
      background-color: #E2E2E2;
      max- 512px;
      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: #aaa;
      margin: 0 0 25px;
      display: flex;

    }

    .box-tall {
      height: 400px;
    }

    .box-item {
       100px;
      height: 100px;
      line-height: 100px;
      vertical-align: middle;
      margin: 5px;
      background-color: #ffd200;
      font-size: 50px;
      color: white;
      text-align: center;
    }

    .item-tall {
      height: 200px;
      line-height: 200px;
    }


    .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: 44px;
      line-height: initial;
      text-decoration: underline;
    }

    .box-14 .item-tall {
      font-size: 61px;
      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: 7px;
      position: relative;
      top: -75px;
    }

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

    .box-23 .grow-2 {
      flex-grow: 2;
    }

    .box-24 .box-item {
       200px;
    }

    .box-24 .shrink {
      flex-shrink: 0;
    }

    .box-25 .box-item {
      flex-basis: 100px;
       200px; /*width 将失去作用*/
    }

    .box-26 {
      height: 200px;
    }

    .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>
  <br>
  <br>
  <hr />
  <div class="thanks">
    <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>
    </p>
    <p>
      参考链接：<a href="http://static.vgee.cn/static/index.html">http://static.vgee.cn/static/index.html</a>
    </p>

    <p>
      GitHub：<a href="https://github.com/JailBreakC/flex-box-demo">https://github.com/JailBreakC/flex-box-demo</a>
    </p>
  </div>
</body>

</html>
    View Code

    效果展示：
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  • 原文地址：https://www.cnblogs.com/muzidaitou/p/12461795.html
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