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flex布局-实践
︷肉園耔︷
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— flex 布局 属于弹性布局

  • flex 有主轴 和交叉轴和剩余空间的变换，可以随时可以让字元素以设置宽度来进行缩小和放大或者自适应
  • 图例：

-代码区

  1. *{
  2.     box-sizing: border-box;
  3. margin: 0;
  4. padding: 0;
  5. }
  6. .container{
  7.     display: flex;
  8.     width: 40rem;
  9.     height: 15em;
  10.     border: 1px solid #000;
  12.     /*主轴变横向*/
  13.      /* flex-direction: column; */
  14.      /*换行显示*/
  15.      /* flex-flow: row wrap; */
  17.      /*剩余空间位于所有项目的左边*/
  18.     /* justify-content: flex-start;
  19.      /*剩余空间位于所有项目的右边*/
  20.      /*justify-content:flex-end;
  21.      /*剩余空间位于所有项目的中边*/
  22.     /* justify-content: center;
  23.       /*剩余空间两端对齐*/
  24.      /*justify-content: space-between;
  25.      /*剩余空间分散对齐*/
  26.      /*justify-content: space-around;
  27.      /*剩余空间平均对齐*/
  28.      /*justify-content: space-evenly;
  30.      /*交叉轴对齐：交叉轴剩余空间*/
  31.      /*align-items: stretch;*/
  33.      /* align-items: flex-start;  */
  34.      /* align-items: flex-end;  */ 
  35.      /* align-items:center;  */
  37.     }
  38. .container > .itm{
  39.     height: 10em;
  40.     background-color: lightcyan;
  41.     border: 1px solid #000;
  42. }
  43. .container {
  44.     /* flex-direction: row nowrap; */
  45.     /* flex-wrap: nowrap;*/
  46.     /* flex-direction: row;  */
  49.     /* align-items:flex-start; */
  50.     /*flex-direction:row-reverse;*/
  51.     /* flex-direction:column-reverse;  */
  53. }

— flex 属性 （允许放大，允许缩小，宽度自动）

  • 图例

  • 代码区

    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>Document</title>
    8. <style> .container{
    9.            height:20rem;
    10.            border: 1px  solid;
    11.            display: flex;        
    12.    }
    13.    .container > .item {
    14.        width: 20rem;  
    15.        background-color: lightcyan;
    16.        border: 1px solid;
    17.        /*项目的计算尺寸，优先级大于width */
    18.        flex-basis: 25rem;
    19.        /*禁止收缩*/
    20.        /* flex-shrink: 1;
    21.        /* 默认允许收缩 */
    22.        /*flex-grow:1;
    23.       flex-grow: 0; */
    24.       /*flex默认：禁止放大，允许收缩，宽度自动*/
    25.       /* flex: 0 1 auto;   */
    26.       /*flex 允许放大 允许缩小  宽度自动*/
    27.      /*flex: 1 0 auto;*/
    29.      /*单值语法*/
    30.      /* flex: 1; */
    31.    }
    33.    .container > .item:first-of-type, .container > .item:last-of-type{
    34.        background-color: lightgreen;
    35.        flex: 0 1 auto;
    36.    }
    37.    .container > .item.two{
    38.        background-color: violet;
    39.        align-self: center;
    40.        align-self:stretch;
    41.    }
    42.    </style>
    43. </head>
    44. <body>
    45.    <div class="container">
    46.        <div class="item">item1</div>
    47.        <div class="item two">item2</div>
    48.        <div class="item">item3</div>
    49.        <!-- <div class="item">item4</div> -->
    50.    </div>
    51. </body>
    52. </html>
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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