【响应式布局】使用 flexbox 实现简单响应式布局

场景和需求

屏幕 > 540px，前两个部分展示两列，
屏幕 < 540px，前两个部分展示一列
屏幕 < 540px，第一部分要反转展示
屏幕 > 769px，第三个部分展示三列
屏幕 < 769px，第三个部分展示一列

效果图

请添加图片描述

实现方式一：改变 flex-direction（推荐）

DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Documenttitle>
  <style>
     * {
      margin: 0;
      padding: 0;
     }

     body {
      display: flex;
      flex-direction: column;
      gap: 1em;
      padding: 1em;
     }

    .container {
      display: flex;
      gap: 1em;
    }

    .container > * {
      flex: 1;
    }

    .container > :first-child {
      background-color: cyan;
    }
    

    @media (max-width: 540px) {
    
      .container--col-2-reverse {
        flex-direction: column-reverse;
      }
      
      .container--col-2 {
        flex-direction: column;
      }
    } 

    
    @media (max-width: 769px) {
      .container--col-3 {
        flex-direction: column;
      }
    } 



  style>
head>
<body>
  <div class="container container--col-2-reverse">
    <div>
      Happy birthday!!!party1
    div>
    <div>
      Happy birthday!!!party2
    div>
  div>
  <div class="container container--col-2">
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
  div>
  <div class="container container--col-3">
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
  div>
  
body>
html>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87

实现方式二：改变 flex-wrap + flex-basis（一般）

DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Documenttitle>
  <style>
     * {
      margin: 0;
      padding: 0;
     }

     body {
      display: flex;
      flex-direction: column;
      gap: 1em;
      padding: 1em;
     }

    .container {
      display: flex;
      gap: 1em;
    }

    .container > * {
      flex: 1;
    }

    .container > :first-child {
      background-color: cyan;
    }
    

    @media (max-width: 540px) {

      
      .container--col-2-reverse {
        flex-wrap: wrap-reverse;
      }

      .container--col-2-reverse > * {
        flex-basis: 100%;
      }

      .container--col-2 {
        flex-wrap: wrap;
      }
      
      .container--col-2 > * {
        flex-basis: 100%;
      };

    } 

    
    @media (max-width: 769px) {
      .container--col-3 {
        flex-wrap: wrap;
      }

      .container--col-3 > * {
        flex-basis: 100%;
      }
    } 



  style>
head>
<body>
  <div class="container container--col-2-reverse">
    <div>
      Happy birthday!!!party1
    div>
    <div>
      Happy birthday!!!party2
    div>
  div>
  <div class="container container--col-2">
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
  div>
  <div class="container container--col-3">
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dignissimos ratione eligendi repellendus illo temporibus corrupti, error ullam ipsam magni necessitatibus quas animi dolore placeat, voluptatibus, reiciendis obcaecati rem unde quos!
    p>
  div>
  
body>
html>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102

相关阅读:
CSS 选择器
 Vue前端proxy代理解决完跨域问题后报错404(Not Found)
Vue3学习——pinia
《微机原理》-绪论
 C#闭包详解
 【Arduino+ESP32专题】Arduino时间控制函数
 国产时序数据库IotDB安装、与SpringBoot集成
 一文深刻解析UWB是什么技术？
解锁远程联机模式：使用MCSM面板搭建我的世界服务器，并实现内网穿透公网访问
 【论文阅读】CVPR2021: MP3: A Unified Model to Map, Perceive, Predict and Plan
原文地址：https://blog.csdn.net/u012557814/article/details/127936375