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flex容器与项目中常用的属性
guyuqing
Original
682 people have browsed it

flex布局术语

序号 简称 描述
1 二根轴 主轴和交叉轴
2 二条线 起始线和终止线
3 二个主体 容器和项目
4 一个空间 剩余空间

图示:

  • 特点

  1. 任何一个可视元素,添加display:flex后都可转为flex弹性容器

  2. flex弹性容器内的直接子元素称之为flex项目,它是真正的布局目标对象

  • 常用属性
    1.flex-flow: 描述主轴方向和是否换行
    例如 flex-flow: row nowrap; 默认值
    2.justify-content:描述项目在主轴上的对齐方式
    例如 justify-content: flex-start; 默认值
    3.align-items:描述项目在交叉轴对齐的方式
    例如 align-items: flex-start;
    4.flex: 放大因子 收缩因子 计算大小
    flex默认: 禁止放大, 允许收缩, 宽度自动
    flex默认可以写作 flex: 0 1 auto;
    或者
    flex: initial;
    5.align-self: 单独设置某个项目在交叉轴上的对齐
    例如 align-self: flex-start;

flex布局实例

代码显示

代码

html

  1. <!DOCTYPE html>
  2. <html lang="en">
  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>flex容器</title>
  8.     <link rel="stylesheet" href="flex.css">
  9. </head>
  10. <body>
  11.     <header>页眉</header>
  12.     <div class="container">
  13.       <aside>左侧</aside>
  14.       <main class="main">
  15.         <div class="item">item1</div>
  16.         <div class="item two">item2</div>
  17.         <div class="item three">item3</div>
  18.       </main>
  19.       <aside>右侧</aside>
  20.     </div>
  21.     <footer>页脚</footer>
  22. </body>
  23. </html>

css

  1. * {
  2.     margin:0;
  3.     padding:0;
  4.     box-sizing: border-box;
  5. }
  7. :root {
  8.     font-size:10px;
  9. }
  11. body {
  12.     font-size:1.6rem;
  13. }
  15. header,
  16. footer {
  17.     height: 5rem;
  18.     background-color: rgba(151, 150, 149, 0.897);
  19. }
  21. .container {
  22.     display: flex;
  23.     flex: 1,1,auto;
  24.     justify-content: space-between;
  25.     min-height: 50rem;
  26. }
  28. .container > aside {
  29.     border: 1px solid;
  30.     background-color:rgba(255, 192, 192, 0.294);
  31.     width: 15rem;
  32.     margin: 2px 5px;
  33. }
  35. .container > .main {
  36.     display: flex;
  37.     flex-flow: column nowrap;
  38.     border: 1px solid;
  39.     background-color:pink;
  40.     flex: 1;
  41.     margin: 2px 5px;
  42.     justify-content:space-evenly;
  43.     align-items: center;
  44. }
  46. .main > .item {
  47.     border: 1px solid;
  48.     background-color:rgb(160, 154, 155);
  49.     height: 5rem;
  50.     width: 50rem;
  51. }
  53. .main .item.two {
  54.     background-color: rgb(243, 237, 243);
  55.     align-self: flex-start;
  56.     order: -1;
  57.   }
  59. .main .item.three {
  60.     background-color: rgba(53, 51, 53, 0);
  61.     align-self: flex-end;
  62. }
Correcting teacher：PHPzPHPz

Correction status：qualified

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