css学习之伪类选择器

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效果图

代码如下

<!DOCTYPE html>
<html lang="en">
<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>选择器：伪类</title>
 <link rel="stylesheet" href="" />
 /* 总结一下 1. 获取指定的某一个: (b) 2, 获取前几个, (-n+b) 3.
 获取指定位置后的全部元素, (n+b) 4. 获取全部偶数(2n/even)或奇数(2n+1/odd)元素
 */
 <style>
   li {
     border: 1px solid;
   }
   /* :nth-of-type()分组匹配，在匹配前将元素分类后再匹配
   没有 >  这个符号会递归选择*/
   /* 1.选择第1个 */
   .list > :nth-of-type(1) {
     background-color: red;
   }
   /* 用first-of-type实现第一个 */
   .list > :first-of-type {
     background-color: red;
   }
   /* 2.选择第二个 */
   .list > :nth-of-type(2) {
     background-color: green;
   }
   /* 3.选择最后一个 */
   .list > :last-of-type {
     background-color: yellow;
   }
   /* 4.用last-of-type实现选择倒数第二个 */
   .list > :nth-last-of-type(2) {
     background-color: black;
   }
   /* 5.选择器数值的属性结构
   nth-of-type(参数)
   an+b a为系数;n为计数器 从0开始;b是偏移量 也是从0开始;元素的有效编号: 必须从1开始 */
   /* 从第四行 1n+4==>n+4*/
   .list-small > :nth-of-type(1n + 4) {
     background-color: cyan;
   }
   /* 选择前三行 */
   .list-small > :nth-of-type(-n + 3) {
     background-color: orange;
   }
   /* 选择后三行 */
   .list-small > :nth-last-of-type(-n + 3) {
     background-color: blue;
   }
   /* 选择偶数行 2n或者even */
   .list-small > :nth-of-type(even) {
     background-color: lightgreen;
   }
   /* 选择偶数行 2n+1或者odd */
   .list-small > :nth-of-type(odd) {
     background-color: rgb(211, 144, 238);
   }
 </style>
</head>
<body>
 <!-- 伪类：类是class -->
 <ul class="list">
   <li>item1</li>
   <li>item2</li>
   <li>
     item3
     <ul class="list-small">
       <li>bb1</li>
       <li>bb2</li>
       <li>bb3</li>
       <li>bb4</li>
       <li>bb5</li>
       <li>bb6</li>
       <li>bb7</li>
       <li>bb8</li>
       <li>bb9</li>
       <li>bb10</li>
     </ul>
   </li>
   <li>item4</li>
   <li>item5</li>
   <li>item6</li>
   <li>item7</li>
   <li>item8</li>
 </ul>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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css学习之伪类选择器

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