flex项目上的三个属性及移动商城首页的页眉和页脚的布局

flex项目上的三个属性

1.项目的缩放比例与基准宽度

flex属性用法及演示：

a) 默认值,禁止放大,允许收缩,宽度自动
0 1 auto
b) 允许放大和收缩
1 1 auto
c) 禁止放大和收缩，这个属性这是通常用于PC布局
0 0 none
下面演示允许缩放功能

<!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>Flex项目的三个属性</title>
    <style>
        root: {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-size: 10px;
        }
        body {
            font-size: 1.6rem;
        }
        .box {
            display: flex;
            border: solid 1px red;
            height: 80vh;
        }
        .item {
            width: 8rem;
            /* 允许放大，缩小，宽度自适应 */
            flex: 1 1 auto;
            border: aquamarine 1px solid;
        }
        .item:nth-of-type(1) {
            background-color: red;
        }
        .item:nth-of-type(2) {
            background-color: yellow;
        }
        .item:nth-of-type(3) {
            background-color: blue;
        }
        .item:nth-of-type(4) {
            background-color: greenyellow;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="item">item1</div>
        <div class="item">item2</div>
        <div class="item">item3</div>
        <div class="item">item4</div>
    </div>
</body>
</html>

2.单个项目在交叉轴上的对齐方式

align-self属性用法及演示：

a) 默认值:stretch 拉伸
b) flex-start 起始线（交叉轴对齐）
c) flex-end 终止线（交叉轴对齐）
d) center 居中对齐
下面演示flex-end功能

<!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>Flex项目的三个属性</title>
    <style>
        root: {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-size: 10px;
        }
        body {
            font-size: 1.6rem;
        }
        .box {
            display: flex;
            border: solid 1px red;
            height: 80vh;
            /* 主轴垂直不换行 */
            /* flex-flow: column nowrap; */
        }
        .item {
            width: 8rem;
            /* 底部对齐 */
            align-self: flex-end;
            border: aquamarine 1px solid;
        }
        .item:nth-of-type(1) {
            background-color: red;
        }
        .item:nth-of-type(2) {
            background-color: yellow;
        }
        .item:nth-of-type(3) {
            background-color: blue;
        }
        .item:nth-of-type(4) {
            background-color: greenyellow;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="item">item1</div>
        <div class="item">item2</div>
        <div class="item">item3</div>
        <div class="item">item4</div>
    </div>
</body>
</html>

3.项目在主轴上排列顺序

order属性用法及演示：

a) 显示顺序:按书写的序号越小越靠前,越大越靠后
下面演示order设置倒序功能

<!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>Flex项目的三个属性</title>
    <style>
        root: {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-size: 10px;
        }
        body {
            font-size: 1.6rem;
        }
        .box {
            display: flex;
            border: solid 1px red;
            height: 80vh;
            /* 主轴垂直不换行 */
            /* flex-flow: column nowrap; */
        }
        .item {
            width: 8rem;
            /* 居中对齐 */
            align-self: center;
            border: aquamarine 1px solid;
        }
        /* 设置倒序 */
        .item:nth-of-type(1) {
            background-color: red;
            order: 4;
        }
        .item:nth-of-type(2) {
            background-color: yellow;
            order: 3;
        }
        .item:nth-of-type(3) {
            background-color: blue;
            order: 2;
        }
        .item:nth-of-type(4) {
            background-color: greenyellow;
            order: 1;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="item">item1</div>
        <div class="item">item2</div>
        <div class="item">item3</div>
        <div class="item">item4</div>
    </div>
</body>
</html>

移动商城首页的页眉和页脚的布局

页头页脚布局

<!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>Document</title>
    <link rel="stylesheet" href="static/css/index.css">
    <link rel="stylesheet" href="static/icon-font/iconfont.css">
    <link rel="stylesheet" href="static/css/header.css">
    <link rel="stylesheet" href="static/css/footer.css">
</head>
<body>
    <!-- 页眉 -->
    <div class="header">
        <!-- 菜单 -->
        <div class="menu iconfont icon-menu"></div>
        <!-- 搜索框 -->
        <div class="search">
            <div class="logo">
                JD
            </div>
            <div class="zoom iconfont icon-search"></div>
            <input type="text" class="words" value="移动硬盘500G">
        </div>
        <!-- 登录按钮 -->
        <a href="" class="login">登录</a>
    </div>
    <div class="main">
        主体
    </div>
    <div class="footer">
        <div>
            <div class="iconfont icon-home"></div>
            <span>首页</span>
        </div>
        <div>
            <div class="iconfont icon-layers"></div>
            <span>分类</span>
        </div>
        <div>
            <div class="iconfont icon-Group-"></div>
            <span>惊喜</span>
        </div>
        <div>
            <div class="iconfont icon-shopping-cart
"></div>
            <span>购物车</span>
        </div>
        <div>
            <div class="iconfont icon-user"></div>
            <span>未登录</span>
        </div>
    </div>
</body>
</html>