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1024作业（en和rem）
A 管志岗-电商策划
Original
625 people have browsed it

1. em,rem的特点是什么？应用场景是什么?

em: 是继承父级元素或者当前元素

也是随着父级或者当前元素变换大小
根元素设置方式：
使用方式推荐用电脑端

rem: 是根元素，可以自定义

建议手机端使用
html 或者 伪类 :root,都可以自定义
使用方式推荐用电手机端

  1.     html{
  2.         font-size:32px;
  3.       }
  4.       :root{
  5.         font-size:32px;
  6.       }

使用rem+vw做表格

  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>细说表格</title>
  8.     <style>
  9.       :root {
  10.         /* margin: 0; */
  11.         /* padding: 0; */
  12.         font-size: 100px;
  13.         /* 1rem = 100px */
  14.       }
  15.     </style>
  16.   </head>
  17.   <body>
  18.     <table
  19.       border="1"
  20.       style="
  21.         line-height: 0.3rem;
  22.         width: 40vw;
  23.         text-align: center;
  24.         font-size: 0.16rem;
  25.         border-radius: 0.1rem;
  26.         border-collapse: collapse;
  27.       "
  28.     >
  29.       <caption>
  30.         商品属性
  31.       </caption>
  32.       <thead style="background-color: #f40">
  33.         <tr>
  34.           <th>1</th>
  35.           <th>名称</th>
  36.           <th>价格</th>
  37.           <th>颜色</th>
  38.           <th>尺寸</th>
  39.           <th>配置</th>
  40.         </tr>
  41.       </thead>
  42.       <!-- 表体必选，浏览器自动生成tbody，一个表格中可以有多个tbody -->
  43.       <tbody>
  44.         <!-- 先写tr，创建一个新行（单元格的容器）
  45.         td单元格储存数据的地方，th有预置样式：加粗居中
  46.         跨行合并：rowspan, row行， span合并
  47.         -->
  48.         <tr>
  49.           <td>1</td>
  50.           <td>联想</td>
  51.           <td>4500</td>
  52.           <td>红色</td>
  53.           <td>14</td>
  54.           <td>i5</td>
  55.         </tr>
  56.         <tr>
  57.           <td>2</td>
  58.           <td>鸿基</td>
  59.           <td>4800</td>
  60.           <td rowspan="3">黑色</td>
  61.           <td>13</td>
  62.           <td>i5</td>
  63.         </tr>
  64.         <tr>
  65.           <td>3</td>
  66.           <td>戴尔</td>
  67.           <td>4900</td>
  68.           <!-- <td>黄色</td> -->
  69.           <td>15</td>
  70.           <td>i7</td>
  71.         </tr>
  72.         <tr>
  73.           <td>4</td>
  74.           <td>华硕</td>
  75.           <td>6000</td>
  76.           <!-- <td>黑色</td> -->
  77.           <td>14.8</td>
  78.           <td>i7</td>
  79.         </tr>
  80.         <tr>
  81.           <td>5</td>
  82.           <td>苹果</td>
  83.           <td>8999</td>
  84.           <td>白色</td>
  85.           <td>14</td>
  86.           <td>i7</td>
  87.         </tr>
  88.       </tbody>
  89.       <tfoot>
  90.         <tr>
  91.           <th>6</th>
  92.           <th></th>
  93.           <th>29199</th>
  94.           <th colspan="3"></th>
  95.           <!-- <th>29199</th> -->
  96.           <!-- <th>29199</th> -->
  97.         </tr>
  98.       </tfoot>
  99.     </table>
  100.   </body>
  101. </html>

效果图width=40vw ==> 40%

效果图

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：完成的很好，继续加油
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