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3.24实例演示flex容器中的四个属性的功能，参数，以及作用
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弹性项目在主轴上的对齐方式

  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>弹性项目在主轴上的对齐方式</title>
  8.     <style>
  9.       * {
  10.         box-sizing: border-box;
  11.       }
  12.       :root {
  13.         font-size: 10px;
  14.       }
  15.       body {
  16.         font-size: 1.6rem;
  17.       }

转为flex布局,这个元素就叫flex容器,弹性容器

  1.   .container {
  2.         display: flex;
  3.         height: 20rem;
  4.         height: 100vh;
  5.         border: 1px solid #000;
  6.       }

项目样式: 必须是flex容器的子元素 .flex容器中的子元素自动成flex容器的项目,并且是行内块显示

  1.  .container > .item {
  2.         /* padding: 1rem; */
  3.         /* width: 10rem; */
  4.         height: 4rem;
  5.         background-color: lightblue;
  6.         border: 1px solid #000;
  7.       }

1.单行容器

  • 主轴方向：默认水平
    flex-direction: row;
  • 禁止换行
    flex-wrap: nowrap;
  • flex-flow: 主轴方向 是否换行;
    flex-flow: column nowrap;
    1. .container {
    2.       /* 主轴方向：默认水平，行 */
    3.       flex-direction: row;
    4.       /* 禁止换行 */
    5.       flex-wrap: nowrap;
    6.       /* flex-flow: 主轴方向 是否换行; */
    7.       flex-flow: row nowrap;
    8.     }

    2.多行容器

  • 允许换行
    flex-flow: row wrap;
  • 主轴垂直
    flex-flow: column nowrap;
  • 手机端常用的布局
    flex-flow: column nowrap;
    1. .container {
    2.       /* 允许换行 */
    3.       flex-flow: row wrap;
    4.       /* 主轴垂直 */
    5.       flex-flow: column nowrap;
    6.       /* 手机端常用的布局 */
    7.       flex-flow: column nowrap;
    8.     }
    ```
    </style>
    </head>
    <body>
    <div class="container">
    1. <div class="item">item1</div>
    2. <div class="item">item2</div>
    3. <div class="item">item3</div>
    4. <div class="item">item4</div>
    5. <div class="item">item5</div>
    6. <div class="item">item6</div>
    7. <div class="item">item7</div>
    8. <div class="item">item8</div>
    9. <div class="item">item9</div>
    10. <div class="item">item10</div>
    </div>
    </body>
    </html>
  1. #弹性项目在主轴上的对齐方式

<!DOCTYPE html>

<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>弹性项目在主轴上的对齐方式</title>
<style>
* { box-sizing: border-box; } :root { font-size: 10px; } body { font-size: 1.6rem; }
###转为flex布局,这个元素就叫flex容器,弹性容器
.container { display: flex; height: 20rem; border: 1px solid #000; }
###项目样式: 必须是flex容器的子元素
.container > .item { width: 10rem; height: 5rem; background-color: lightcyan; border: 1px solid #000; }
###设置项目在主轴的对齐方式的前提是: 主轴上存在剩余空间
- 1. 将所有项目看成一个整体来处理
justify-content: flex-start; justify-content: flex-end; justify-content: center;
- 2.将所有项目看成一个个独立的个体来处理
- 二端对齐
justify-content: space-between;
- 分散对齐
justify-content: space-around;
- 平均对齐
justify-content: space-evenly;

###项目在交叉轴上的对齐方式: align-items
.container { align-items: stretch; align-items: flex-start; align-items: flex-end; align-items: center; }
</style>
</head>
<body>
<div class="container">
<div class="item">item1</div>
<div class="item">item2</div>
<div class="item">item3</div>
<div class="item">item4</div>
</div>
</body>
</html>

弹性项目多行容器主轴中的对齐方式

多行容器中对齐时,主轴是没有剩余空间的,为什么?有剩余空间就不换行
换行后,如果需要设置对方方式,就要求交叉轴上必须要有剩余空间 

  1.     .container {
  2.         flex-flow: row wrap;
  3.         align-content: stretch;

将交叉轴上所有项目看成一个整体

  1.         align-content: flex-start;
  2.         align-content: flex-end;
  3.         align-content: center;

看成个体

  • 二端对齐
    align-content: space-between;
  • 分散对齐
    align-content: space-around;
  • 平均对齐
    align-content: space-evenly;
    </style>
    </head>
    <body>
    <div class="container">
    1. <div class="item">item1</div>
    2. <div class="item">item2</div>
    3. <div class="item">item3</div>
    4. <div class="item">item4</div>
    5. <div class="item">item5</div>
    6. <div class="item">item6</div>
    7. <div class="item">item7</div>
    8. <div class="item">item8</div>
    9. <div class="item">item9</div>
    10. <div class="item">item10</div>
    11. <div class="item">item11</div>
    12. <div class="item">item12</div>
    </div>
    </body>
    </html>
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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