What is a selector? The role of the selector is to find the element through it and pass the css style to the element! The css selector is mainly divided into four categories: basic selector, attribute selector, combination selector and pseudo-class selector!
css basic selector
Basic selectors are further divided into: wildcards, tag selectors, class selectors, and id selectors. The programming ideas that need to be noted here have only one id in the CSS cascading style sheet. Note the following points 1. Uniqueness of the id 2. The element id is not the same, just like each person has only one ID card, the ID represents the ID card 3. The class selector is not unique, it can be reused! In addition, this wildcard represents the global
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 <title>css基本选择器</title>
7 <style type="text/css">
8 *{
9 color: skyblue;
10 }/**通配符*/
11 div{
12 color: red;
13 }/*标签选择器*/
14 .box{
15 color: steelblue;
16 }/*class选择器*/.box{color: steelblue;}也可以写成*.box{color: steelblue;}代表的所有的box字体颜色为 steelblue 17 #content{
18 color: tomato;
19 }/*id选择器*/
20 </style>
21 </head>
22 <body>
23 <div class="box" id="content">
24 学习Q-q-u-n： 784783012 </div>
26 </body>
27 </html>
css combination selector
The basic selectors are connected by special symbols. Some opinions are called css combination selectors. Common css combination selectors are: group selectors, nested selectors, sub-selectors, and adjacent selectors at the same level.
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 <title>css组合选择器</title>
7 <style type="text/css">
8 /* div{ 9 color: teal; 10 font-size: 24px; 11 } 12 p{ 13 color: teal; 14 } */
15 div{
16 font-size: 24px;
17 }
18 div,p{
19 color: teal;
20 }/*分组选择器*/
21 div p{
22 color: red;
23 }/*嵌套选择器*/
24 ul>li{
25 font-size: 24px;
26 list-style: square;
27 }/*子选择器*/
28 div+p{
29 color: blue;
30 }/*相邻同级别选择器*/
31 </style>
32 </head>
33 <body>
34 <div>
35 成功的花,人们只惊羡她现时的明艳!然而当初她的芽儿,浸透了奋斗的泪泉,洒遍了牺牲的血雨 36 <p>自以为懂得很多了经历很多了最后才知道都是那么的可笑</p>
37 </div>
38 <p>我们不要只看成功者荣誉的瞬间,更要看到成功者为之努力、为之奋斗的过程,从而激励自己也不断付出,奔着那个成功的目标前进.</p>
39 <p>成功的花,人们只惊羡她现时的明艳!然而当初她的芽儿,浸透了奋斗的泪泉,洒遍了牺牲的血雨<span>我们不要只看成功者荣誉的瞬间,更要看到成功者为之努力、为之奋斗的过程,从而激励自己也不断付出,奔着那个成功的目标前进.</span></p>
40 <ul>
41 <li>1</li>
42 <li>2</li>
43 <li>3</li>
44 </ul>
45 </body>
46 </html>
css attribute selector
Basic selector [attribute], basic selector [attribute = value], basic selector [attribute ~ = value] space separated by multiple spaces, basic selector [attribute ^ = value] where to start, basic selector [attribute $ = Value] end with
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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 <title>css属性选择器</title>
7 <style type="text/css">
8 div[title]/*基本选择器[属性]*/
9 div[title=english]{
10 color: blue;
11 }/*基本选择器[属性=值]*/
12 div[title~=en]{
13 color:#f90;
14 font-weight: bold;
15 }/*基本选择器[属性~=值] 任意包含有属性中的一个*/
16 p,div[title^=zh]{
17 font-size:24px;
18 color: brown;
19 }/*基本选择器[属性^=值]以什么开始*/
20 div[title$=china]{
21 letter-spacing: 10px;
22 text-decoration: line-through;
23 font-style: italic;
24 }/*基本选择器[属性$=值]以什么结束*/
25 </style>
26 </head>
27 <body>
28 <div title="english">
29 If you can NOT explain it simply, you do NOT understand it well enough 30 </div>
31 <div title="english en yingyu">
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