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CSS常用单位的特点及应用实例
安超
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1.CSS中常用的单位主要由:px、em、rem、vw、vx等

a.em 是继承字号，受自身和祖先的特征影响
b.rem 是根字号，主要决定于页面的font-size.是字号常量，不变。默认的font-size为16px
c. vw/vx 决定于视口的宽度。
1vw = 1/100(视口宽度 ,可用window.innerWidth获取)
1vh = 1/100(视口高度，可用window.innerHeight获取)

在使用中经常使用rem，原因在于其不收父级元素的印象，变化方便

2.rem及vw在表格中的应用

效果如图所示：
课程表
代码如下：

  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>表格的应用</title>
  8.     <style>
  9.         table th,
  10.         table td{
  11.             border: 1px solid black;
  12.         }
  13.         table{
  14.             border-collapse: collapse;
  15.             text-align: center;
  16.             width: 90vw;
  17.             margin: auto;
  18.         }
  19.         table th{
  20.             background-color:cadetblue;
  21.         }
  22.         table caption{
  23.             font-size: 1.5rem;
  24.             font-weight: bold;
  25.             margin-bottom: 1em;
  26.         }
  27.      /* 通过下面表格的伪类,将第一行和第六行取出来,设置背景颜色 */
  28.         table tbody tr:nth-of-type(5n+1) td:first-of-type{
  29.             background-color:chartreuse;
  30.         }
  31.     </style>
  32. </head>
  33. <body>
  34.     <table>
  35.         <caption>小学生课程表</caption>
  36.         <thead>
  37.             <tr>
  38.                 <th>时间</th>
  39.                 <th>周一</th>
  40.                 <th>周二</th>
  41.                 <th>周三</th>
  42.                 <th>周四</th>
  43.                 <th>周五</th>
  44.             </tr>
  45.         </thead>
  46.         <tbody>
  47.             <tr>
  48.                 <td rowspan="4">上午</td>
  49.                 <td>数学</td>
  50.                 <td>数学</td>
  51.                 <td>数学</td>
  52.                 <td>数学</td>
  53.                 <td>数学</td>
  54.             </tr>
  55.             <tr>
  57.                 <td>数学</td>
  58.                 <td>数学</td>
  59.                 <td>数学</td>
  60.                 <td>数学</td>
  61.                 <td>数学</td>
  62.             </tr>
  63.             <tr>
  65.                 <td>语文</td>
  66.                 <td>语文</td>
  67.                 <td>语文</td>
  68.                 <td>语文</td>
  69.                 <td>语文</td>
  70.             </tr>
  71.             <tr>
  73.                 <td>英语</td>
  74.                 <td>英语</td>
  75.                 <td>英语</td>
  76.                 <td>英语</td>
  77.                 <td>英语</td>
  78.             </tr>
  79.             <tr>
  80.                 <td colspan="6">中午休息</td>
  81.             </tr>
  82.             <tr>
  83.                 <td rowspan="3">音乐</td>
  84.                 <td>音乐</td>
  85.                 <td>体育</td>
  86.                 <td>体育</td>
  87.                 <td>体育</td>
  88.                 <td>体育</td>
  89.             </tr>
  90.             <tr>
  91.                 <td>美术</td>
  92.                 <td>美术</td>
  93.                 <td>美术</td>
  94.                 <td>美术</td>
  95.                 <td>美术</td>
  96.             </tr>
  97.             <tr>
  98.                  <td>科学</td>
  99.                 <td>科学</td>
  100.                 <td>科学</td>
  101.                 <td>科学</td>
  102.                 <td>科学</td>
  103.             </tr>
  104.         </tbody>
  106.         <tfoot>
  107.             <tr>
  108.                 <td>备注</td>
  109.                 <td colspan="5">每天下午13:30~15:30在学校做作业</td>
  110.             </tr>
  111.         </tfoot>
  112.     </table>
  113. </body>
  114. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：很好，看得出态度很认真，每一次作业完成的都很好，加油
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