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Detailed introduction to css selectors

王林

Release： 2020-04-05 09:12:42

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Detailed introduction to css selectors

What is a selector?

The function of the selector is to find the element through it and pass the css style to the element! CSS selectors are mainly divided into four categories: basic selectors, attribute selectors, combination selectors and pseudo-class selectors!

css basic selector

Basic selector is divided into: * wildcard, label selector, class selector, id selector, you need to pay attention to the programming here The idea is that elements in css cascading style sheets have one and only one id. Pay attention to the following points: 1. ID uniqueness 2. Element IDs are not the same, just like each person has only one ID card, ID represents the ID card 3. The class selector is not unique, it can be reused! In addition, this * wildcard represents the whole world.

  <!DOCTYPE html>
<html>
  <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>css基本选择器</title>
     <style type="text/css">
          *{
              color: skyblue;
         }/**通配符*/
         div{
             color: red;
         }/*标签选择器*/
         .box{
             color: steelblue;
         }/*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
         #content{
             color: tomato;
         }/*id选择器*/
     </style>
 </head>
 <body>
     <div id="content">
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     </div>
 </body>
 </html>

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(Recommended tutorial: CSS introductory tutorial)

css combination selector

Put the basic selector through special symbols There are opinions that stringing them together is called css combination selectors. Common css combination selectors include: group selectors, nested selectors, sub-selectors, adjacent same-level selectors

 <!DOCTYPE html>
  <html>
  <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>css组合选择器</title>
      <style type="text/css">
      /* div{
          color: teal;
         font-size: 24px;
     }
     p{
         color: teal;
     } */
     div{
         font-size: 24px;
     }
     div,p{
         color: teal;
     }/*分组选择器*/
     div p{
         color: red;
     }/*嵌套选择器*/
     ul>li{
         font-size: 24px;
         list-style: square;
     }/*子选择器*/
     div+p{
         color: blue;
     }/*相邻同级别选择器*/
     </style>
 </head>
 <body>
     <div>
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     <ul>
         <li>1</li>
         <li>2</li>
         <li>3</li>
     </ul>
 </body>
 </html>

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css attribute selector

Basic selector [attribute], basic selector [attribute=value], basic selector [attribute~=value] separated by multiple spaces, basic selector [attribute] What does ^=value] start with and what does the basic selector [attribute $=value] end with?

<!DOCTYPE html>
 <html>
 <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>css属性选择器</title>
      <style type="text/css">
     div[title]/*基本选择器[属性]*/
     div[title=english]{
         color: blue;
     }/*基本选择器[属性=值]*/
     div[title~=en]{
         color:#f90;
         font-weight: bold;
     }/*基本选择器[属性~=值] 任意包含有属性中的一个*/
     p,div[title^=zh]{
         font-size:24px;
         color: brown;
     }/*基本选择器[属性^=值]以什么开始*/
     div[title$=china]{
         letter-spacing: 10px;
         text-decoration: line-through;
         font-style: italic;
     }/*基本选择器[属性$=值]以什么结束*/
     </style>
 </head>
 <body>
     <div title="english">
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     </div>
     <div title="english en yingyu">
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