wjs-web-application/layout-patterns/2017-flex-layout.html at main · wjs-tech/wjs-web-application · GitHub

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<!--
  ============================================================
  Flex 弹性布局 - flex 实现各种布局，现代主流方案

  布局方式：CSS3 Flexbox 弹性盒子
  布局思想：
    1. 父容器设为 display: flex，子元素自动成为弹性项目
    2. 通过 justify-content 控制主轴对齐，align-items 控制交叉轴对齐
    3. 子元素通过 flex 属性灵活分配空间，实现自适应布局

  适用场景：
    - 导航菜单水平/垂直排列
    - 居中布局（水平垂直居中轻而易举）
    - 两栏/三栏自适应布局
    - 卡片列表等分布局
    - 响应式布局的基础

  技术要点：
    - display: flex / inline-flex 声明弹性容器
    - flex-direction 控制主轴方向（row/column）
    - justify-content 主轴对齐方式
    - align-items 交叉轴对齐方式
    - flex-grow / flex-shrink / flex-basis 控制弹性
    - flex-wrap 控制是否换行

  可迁移性：
    - 现代前端开发的主流布局方案
    - 可迁移到任何现代网页和应用
    - 移动端优先推荐使用

  wjs created by 2017-03-15
  ============================================================
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Flex 弹性布局</title>
  <style>
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body { font-family: "Microsoft YaHei", sans-serif; color: #333; padding: 20px; }
    h2 { margin: 20px 0 10px; color: #2c3e50; }

    .demo-box {
      margin-bottom: 30px;
      padding: 15px;
      border: 1px solid #ddd;
      border-radius: 4px;
    }

    .flex-row {
      display: flex;
      gap: 10px;
    }
    .flex-row .item {
      flex: 1;
      height: 80px;
      background: #3498db;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .flex-center {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 120px;
      background: #ecf0f1;
    }
    .flex-center .box {
      width: 100px;
      height: 60px;
      background: #e74c3c;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .flex-column {
      display: flex;
      flex-direction: column;
      gap: 10px;
      width: 200px;
    }
    .flex-column .item {
      height: 50px;
      background: #2ecc71;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .flex-holy {
      display: flex;
      gap: 10px;
    }
    .flex-holy .left {
      width: 150px;
      height: 200px;
      background: #9b59b6;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .flex-holy .main {
      flex: 1;
      height: 200px;
      background: #f39c12;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .flex-holy .right {
      width: 120px;
      height: 200px;
      background: #1abc9c;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .flex-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 60px;
      padding: 0 20px;
      background: #2c3e50;
      color: #fff;
    }
    .flex-nav ul {
      display: flex;
      list-style: none;
      gap: 20px;
    }
  </style>
</head>
<body>
  <h1>Flex 弹性布局 Demo</h1>

  <h2>1. 水平等分布局</h2>
  <div class="demo-box flex-row">
    <div class="item">flex: 1</div>
    <div class="item">flex: 1</div>
    <div class="item">flex: 1</div>
    <div class="item">flex: 1</div>
  </div>

  <h2>2. 水平垂直居中</h2>
  <div class="demo-box flex-center">
    <div class="box">完美居中</div>
  </div>

  <h2>3. 垂直排列布局</h2>
  <div class="demo-box flex-column">
    <div class="item">item 1</div>
    <div class="item">item 2</div>
    <div class="item">item 3</div>
  </div>

  <h2>4. 三栏自适应布局</h2>
  <div class="demo-box flex-holy">
    <div class="left">左定宽</div>
    <div class="main">中间自适应</div>
    <div class="right">右定宽</div>
  </div>

  <h2>5. 导航栏布局</h2>
  <div class="demo-box flex-nav">
    <div class="logo">Logo</div>
    <ul>
      <li>首页</li>
      <li>产品</li>
      <li>服务</li>
      <li>关于</li>
    </ul>
  </div>
</body>
</html>