css 伪类

a标签必须按顺序写

link 链接未访问的时候的样式

visited 链接访问后的样式

hover 鼠标放上去的样式

active 链接在访问时的样式

after

before

nth-of-type(2n)  选择属于其父级下面第n个元素
隔行换色：

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         p:nth-of-type(2n){
 8             background: red;
 9         }
10         p:nth-of-type(2n-1){
11             background-color: gold;
12         }
13     </style>
14 </head>
15 <body>
16     <p>1</p>
17     <p>2</p>
18     <p>3</p>
19     <p>4</p>
20     <p>5</p>
21     <p>6</p>
22 </body>
23 </html>

View Code

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         div{
 8             width: 980px;
 9             margin: 0 auto;
10             overflow: auto;
11         }
12         span{
13             float: left;
14             width: 300px;
15             height: 300px;
16             background-color: red;
17             margin:10px ;
18         }
19         span:nth-of-type(3n-1){
20             margin-left: 10px;
21             margin-right: 10px;
22         }
23     </style>
24 </head>
25 <body>
26 <div>
27     <span>1</span>
28     <span>2</span>
29     <span>3</span>
30     <span>4</span>
31     <span>5</span>
32     <span>6</span>
33     <span>7</span>
34     <span>8</span>
35     <span>9</span>
36     <span>10</span>
37     <span>11</span>
38     <span>12</span>
39 </div>
40 </body>
41 </html>

View Code

变换transform
　　　　translateX    位移
　　　　translateY　　 位移
       rotate        旋转
       scale         缩放
　　　　skewX         斜切

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         div{
 8             height: 300px;
 9             width: 980px;
10             border: 1px solid red;
11         }
12         span{
13             width: 200px;
14             height: 200px;
15             background-color: yellow;
16             border: 1px solid red;
17             float: left;
18             transition: 1s;
19         }
20         span:hover{
21             /*transform: translateX(100px) rotate(45deg);*/
22             /*transform:scale(1.3);*/
23             transform: skewX(45deg);
24         }
25     </style>
26 </head>
27 <body>
28 <div>
29     <span></span>
30 </div>
31 </body>
32 </html>

View Code