七种CSS选择器效果演示

亦凉 2022-03-08 06:44 377阅读 0赞

## 一、核心选择器 ##

**1、标签选择器**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70]  
显示效果为：  
![在这里插入图片描述][20190314150932619.png]  
**2.ID选择器**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 1]![在这里插入图片描述][20190314151030917.png]  
**3.类选择器**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 2]

显示效果为：  
![在这里插入图片描述][20190314151126802.png]

## 二、组合选择器 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 3]  
可对多个标签设置同一种样式，显示效果为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 4]

## 三、通配选择器 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 5]  
因为通配选择器会到所有标签增添样式（包括`<html>`和`body`），因此开发中通常不使用，显示效果为：  
![在这里插入图片描述][20190314151456539.png]

## 四、伪类选择器 ##

**1、hover用于鼠标悬停时显示样式**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 6]  
显示效果为：  
![在这里插入图片描述][20190314151606635.png]  
**2、foucs用于元素获得焦点时显示样式效果**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 7]  
显示效果为：  
![在这里插入图片描述][20190314151713912.png]

## 五、关系选择器 ##

**1、包含选择器**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 8]  
显示效果为：  
![在这里插入图片描述][20190314151833354.png]  
**包含选择器与组合选择器共用：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 9]  
显示效果为：  
![在这里插入图片描述][20190314151949878.png]  
**2、子选择器**

*子选择器与包含选择器的区别*  
要注意子选择器与包含选择器的区别：包含选择器是标签元素体内的所有标签（包括其子辈，孙辈，孙孙辈），而子选择器不包括其孙辈等。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 10]  
显示效果为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 11]  
并不包含`<span>`中的`<p>`  
而下面的包含选择器则包含`<span>`当中的 `<p>`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][20190314152559809.png]  
**3.相邻选择器**  
格式：`E F > G { 样式}`

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 14]  
注意：（1）E,F必须是同一父级  
（2）F毕竟紧贴在E之后，中间不能有其他标签  
看下面的演示，首先不是同一父级：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 15]  
!\[在这里插入图片描述\]([https://img-blog.csdnimg.cn/2019031415301578.png?x-oss-process=image/watermark,type\_ZmFuZ3poZW5naGVpdGk,shadow\_10,text\_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx,size\_16,color\_FFFFFF,t\_70][https_img-blog.csdnimg.cn_2019031415301578.png_x-oss-process_image_watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 16]

下面是不相邻：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 18]  
六、兄弟选择器  
格式：`E~F { 样式}`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 19]  
显示效果为：![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 20]  
注意：  
（1）是选择E之后的所有兄弟元素F  
（2）E,F必须是同一父级  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 21]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 22]

## 七、属性选择器 ##

1、`E[attr]`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 23]  
显示效果为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 24]  
2、`E[attr=" "]`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 25]  
显示效果为：  
![在这里插入图片描述][20190314153852958.png]  
3.`E[attr~=" "] //选择包含指定单词的属性`

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 26]  
显示效果为：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 27]  
4、`E[attr != " val "] //选择以val开头并以“-”分割的字符串的元素`

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 28]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 29]

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[20190314150932619.png]: /images/20220308/fef1c72a55c94825a61f34c4c9e71dab.png
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[20190314151030917.png]: /images/20220308/1d26fb579eef4c8da5d031d84444c7ee.png
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[20190314151126802.png]: /images/20220308/c8d11df0a6da4b2b81a6cc3e808f51cc.png
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[20190314151456539.png]: /images/20220308/14ca196463d54644bd037cd5d1792c0e.png
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[20190314151606635.png]: /images/20220308/4dbed87319994d3c9e4b73c522dd8aec.png
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[20190314151713912.png]: /images/20220308/9c500f5de1874388b72be92121795e2f.png
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[20190314151833354.png]: /images/20220308/5f1c210da9c446e38b2dd02d1893aeb4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 9]: /images/20220308/cd280c5a71b14c1f8ff5779a37d933d2.png
[20190314151949878.png]: /images/20220308/6544ec51113547dc83d216aa8762bd48.png
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[20190314152559809.png]: /images/20220308/aadcb0840ddf4cb58085b1cee8390fa9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 13]: /images/20220308/26bec3edc8db42b69521bf017b159b19.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 15]: /images/20220308/13006cf667424e058d36faf46d8febd7.png
[https_img-blog.csdnimg.cn_2019031415301578.png_x-oss-process_image_watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2019031415301578.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyOTI1MDMx_size_16_color_FFFFFF_t_70 25]: /images/20220308/c49bcea94b5c404e933019fee5cffd8f.png
[20190314153852958.png]: /images/20220308/fa1c1d98de274242abc5f3aaf1f495ac.png
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