CSS3选择器

1.CSS3结构选择器

1.1 :nth-child 选择指定索引处的子元素

　　(1) nth-child(n) 父元素下的第n个子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap p:nth-child(1){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

　　(2) nth-child(odd) 奇数子元素（同 nth-child(2n-1)）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap p:nth-child(odd){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

　　(3) nth-child(even) 偶数子元素（同 nth-child(2n)）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap p:nth-child(even){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.2 nth-last-child(n) 倒数第n个元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap p:nth-last-child(2){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.3 nth-of-type(n) 父元素下的第n个指定类型的子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        #wrap div,p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap div{background: #368130;}
        #wrap p:nth-of-type(3){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.4 nth-last-of-type(n) 父元素下的倒数第n个指定类型的子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        #wrap div,p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap div{background: #368130;}
        #wrap p:nth-last-of-type(4){
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.5 :first-child 选择父元素下的第一个子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap :first-child{
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.6 :last-child 选择父元素下的最后一个子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        #wrap :last-child{
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
    </div>  
</body>
</html>
View Code

1.7 :only-child 匹配属于其父元素的唯一子元素的每个元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        p:only-child{
            width: 400px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
        <div>
            <p></p>
        </div>
    </div>  
</body>
</html>
View Code

 

1.8 :only-of-type 选择父元素下指定类型的唯一子元素

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{margin:0;padding: 0;}
        p,span{height: 40px;background: #a2a2a2;margin-top: 10px;width: 500px;margin-left: 40px;}
        p:only-of-type{/*指定类型的唯一子元素*/
            width: 400px;
            border: 1px solid red;
        }
        span{display: block;}
    </style>
</head>
<body>
    <div id="wrap">

        <p>1</p>
        <p>2</p>
        <p>3</p>
        <p>4</p>
        <p>5</p>
        <div>
            <p style="background:#fff;"></p>
            <span>eqeqeqe</span>
        </div>
    </div>  
</body>
</html>
View Code

2.CSS3属性选择器

2.1 E[attr] 属性名，不确定具体属性值

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content">这是第三个div标签</div>
19 </body>
20 </html>
View Code

2.2 E[attr="value"] 指定属性名，并指定其对应属性值

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content">这是第三个div标签</div>
19 </body>
20 </html>
View Code

 

2.2 E[attr~="value"] 指定属性名，其具有多个属性值空格隔开，并包含value值

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class~="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content wrap">这是第三个div标签</div>
19 </body>
20 </html>
View Code

 

2.3 E[attr^="value"] 指定属性名，属性值以value开头

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class^="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content wrap">这是第三个div标签</div>
19 </body>
20 </html>
View Code

 

2.4 E[attr$="value"] 指定属性名，属性值以value结束

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class$="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content wrap">这是第三个div标签</div>
19 </body>
20 </html>
View Code

 

2.5 E[attr*="value"] 指定属性名，属性值中包含了value

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class*="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content wrap">这是第三个div标签</div>
19 </body>
20 </html>
View Code

 

2.6 E[attr|="value"] 指定属性名，属性值以value- 开头

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         *{margin: 0;padding: 0}
10         div[class|="wrap"]{
11             color: red;
12         }
13     </style>
14 </head>
15 <body>
16     <div class="wrap-a">这是第一个div标签</div>
17     <div class="wrapadada" lang="en" id="con">这是第二个div标签</div>
18     <div class="content wrap-b">这是第三个div标签</div>
19 </body>
20 </html>
View Code

3.CSS3伪类选择器

3.1 UI伪类选择器

3.1.1 :enabled、:disabled 选择启用状态（禁用状态元素）

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :enabled{
10             color: red;
11             outline: 1px solid blue;
12         }
13         :disabled{
14             color: green;
15             outline: 1px solid yellow;
16         }
17     </style>
18 </head>
19 <body>
20     <input type="text"></input>
21     <input type="text" value="请输入" disabled></input>
22 </body>
23 </html>
View Code

 

3.1.2 :checked 选择被选中的 input 元素（单选按钮或复选框）

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :checked + label{
10             color: orange;
11         }
12     </style>
13 </head>
14 <body>
15     <input type="radio" name="checked"/>
16     <label>香蕉</label>
17     <input type="radio" name="checked"/>
18     <label>菠萝</label>
19     <input type="radio" name="checked"/>
20     <label>柑橘</label>
21     <input type="radio" name="checked"/>   
22     <label>苹果</label>
23 </body>
24 </html>
View Code

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         div{float: left;margin-right: 10px;width: 60px;height: 50px;}
10         input{display: none;}
11         
12         label{display: block;width: 20px;height: 20px;border-radius: 50%;border: 1px solid red;float: left;margin-right: 3px}
13         
14         :checked + label{
15             background: orange;
16         }
17     </style>
18 </head>
19 <body>
20     <div>
21         <input type="checkbox" id="banana"/>   
22         <label for="banana"></label>
23         香蕉
24     </div>
25     <div>   
26         <input type="checkbox" id="pineapple"/>   
27         <label for="pineapple"></label>
28         菠萝
29     </div>
30     <div>
31         <input type="checkbox" id="orange"/>    
32         <label for="orange"></label>
33         柑橘
34     </div>
35     <div>
36         <input type="checkbox" id="apple"/> 
37         <label for="apple"></label>
38         苹果
39     </div>
40     
41 </body>
42 </html>
View Code

 

3.1.3 :default 选择默认元素

 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         
10         button{
11             width: 80px;
12             height: 30px;
13         }
14         :default{
15             border: 1px solid red;
16         }
17     </style>
18 </head>
19 <body>
20     <form>
21         <input type="text"/>
22         <button>请点击我</button>
23     </form>
24 </body>
25 </html>
View Code

 

3.1.4 :valid、:invalid 根据输入验证选择有效或无效的input元素

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :valid{
10             color: red;
11             outline: 2px solid orange;
12         }
13     </style>
14 </head>
15 <body>
16     <input type="text" required/>
17     
18 </body>
19 </html>
View Code

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :invalid{
10             color: red;
11             outline: 1px solid orange;/*轮廓*/
12         }
13     </style>
14 </head>
15 <body>
16     <input type="text" required/>
17     
18 </body>
19 </html>
View Code

 

3.1.5 :in-range、:out-of-range 选择指定范围之内或者之外受限的元素

 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :in-range{
10             color: blue;          
11         }
12         :out-of-range{
13             color: red;
14             outline: 2px solid red;
15         }
16     </style>
17 </head>
18 <body>
19     <input type="number" min="1" max="10"/>
20 </body>
21 </html>
View Code

 

3.1.6 :required、:optional 根据是否允许  :required属性选择input元素

 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         :required{
10             color: red;
11             outline: 1px solid red;
12         }
13         :optional{
14             color: blue;
15             outline: 1px solid blue;
16         }
17     </style>
18 </head>
19 <body>
20     <input type="text" required/>
21     <input type="text"/>
22 </body>
23 </html>
View Code

3.2 动态伪类选择器

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <style>
 9         a{
10             text-decoration: none;           
11         }
12         :link{
13             color: orange;
14         }
15         :visited{
16             color: blue;
17         }
18         :hover{
19             color: black;
20         }
21         :active{
22             color: red;
23         }
24     </style>
25 </head>
26 <body>
27     <a href="http://www.baidu.com" target="_blank">百度一下</a>
28 </body>
29 </html>
View Code

3.2.1 :link 选择链接元素

 3.2.2 :hover:鼠标悬停其上的元素

 

3.2.3 :active 鼠标点击时触发的事件

3.2.4 :visited 选择用户已访问的元素

 

3.3 其他伪类选择器

3.3.1  :not(<选择器>) 对括号内选择器的选择取反

3.3.2 :lang(<目标语言>) 基于lang全局属性的元素

3.3.3 :target url 片段标识符指向的元素

3.3.4 :empty 选择内容为空的元素

3.3.5 :selection 鼠标光标选择元素内容

 

posted @ 2018-09-27 12:42  夜色中的烟雨楼  阅读(251)  评论(0)  编辑  收藏  举报