【案例】学习flex项目上的三个属性并尝试制作移动端京东首页 - CSS

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flex弹性盒模型

flex 属性众多,记住以下几个就够用了,尽可能使用简写

1. 术语

容器: 具有display:flex属性元素
项目: flex 容器的”子元素”
主轴: 项目排列的轴线
交叉轴: 与主轴垂直的轴线

2. 容器属性

序号	属性	描述
1	`flex-flow`	主轴方向与换行方式
2	`justify-content`	项目在主轴上的对齐方式
3	`align-items`	项目在交叉轴上的对齐方式
4	`align-content`	项目在多行容器中的对齐方式

3. 项目属性

序号	属性	描述
1	`flex`	项目的缩放比例与基准宽度
3	`align-self`	单个项目在交叉轴上的对齐方式
4	`order`	项目在主轴上排列顺序

flex项目属性

        /* flex: flex-grow flex-shrink flex-basis */
        /* flex: 放大因子 收缩因子 项目在主轴上的基准宽度 */
        /* flex-basis: 项目占据的主轴宽度,优先级大于width,小于min-width */
        /* 默认值,禁止放大,但允许自动收缩,项目宽度自动计算 */
        flex: 0 1 auto;
        /* 默认值使用关键字简写 */
        flex: initial;
        /* 允许放大和收缩 */
        flex: 1 1 auto;
        /* 简写 */
        flex: auto;
        /* 禁止放大和收缩 */
        flex: 0 0 auto;
        /* 简写 */
        flex: none;
        /* 如果只有一个数字,省掉后面二个参数,表示的放大因子 */
        flex: 1;
        /* 等于  flex: 1 1 auto; */
          /* flex通常不会用来设置所有项目的默认选项,通常用来设置某一个项目的特征 */

/* 写一个案例,要求第2个,第3个项目的宽度是第1个和第四个2倍 */
      /* 选择第一个和第四个项目 */
      .container > .item:first-of-type,
      .container > .item:last-of-type {
        flex: 1;
      }
      /* 选择第二个和第三个项目 */
      .container > .item:nth-of-type(2),
      .container > .item:nth-of-type(2) + * {
        flex: 2;
      }

align-self属性单个项目在交叉轴上的对齐方式

    /* 例如设置第2个项目与其它项目的对齐方式不一样 */
      .container > .item:nth-of-type(2) {
        align-self: stretch;
        align-self: flex-start;
        align-self: flex-end;
        align-self: center;
      }

order属性项目在主轴上排列顺序

        /* 显示顺序:默认按书写的源码顺序排列 */
      /* 默认序号越小越靠前,越大越靠后 */
      .container > .item:first-of-type {
        order: 1;
        order: 5;
        background-color: yellow;
      }
      .container > .item:nth-of-type(2) {
        order: 2;
        background-color: lightgreen;
      }
      .container > .item:nth-of-type(3) {
        order: 3;
        order: 0;
      }
      .container > .item:last-of-type {
        order: 4;
        /* 支持负值 */
        order: -1;
        background-color: #ccc;
      }

4.移动端京东首页

项目结构

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>移动端京东首页</title>
    <link rel="stylesheet" href="static/css/header.css">
    <link rel="stylesheet" href="static/css/footer.css">
    <link rel="stylesheet" href="static/css/nav.css">
    <link rel="stylesheet" href="static/css/banner.css">
    <link rel="stylesheet" href="static/css/tj.css">
    <link rel="stylesheet" href="static/css/index.css">
    <!-- 引入字体图标 -->
    <link rel="stylesheet" href="static/icon-font/iconfont.css">
</head>
<body>
    <!-- 页眉头部 -->
    <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 ">
                <span class="iconfont icon-search"></span>
            </div>
            <input type="text" class="words" value="移动硬盘500G">
        </div>
        <!-- 登录按钮 -->
        <a href="http://" target="_blank" class="login">登录</a>
    </div>
    <!-- 主体 -->
    <div class="main">
        <!-- 轮播图 -->
        <!-- banner区 -->
        <div class="banner">
            <a href="https://pro.m.jd.com/mall/active/2d4Hw2SqrLkZ6K8wzqZJN2AoJWGA/index.html">
                <img src="https://m.360buyimg.com/mobilecms/s250x200_jfs/t1/171298/2/14126/63148/60585644Eca26db11/58967bace7177cb5.jpg!q70.jpg.dpg" alt="">
            </a>
            <a href="https://pro.m.jd.com/mall/active/3wpbRPaYiHTigHCyrGVDQKwy69NG/index.html">
                <img src="https://m.360buyimg.com/mobilecms/s250x200_jfs/t1/166211/4/14279/77377/605be5adEc517f1fa/1514376c9619dbcc.jpg!q70.jpg.dpg" alt="">
            </a>
            <a href="https://pro.m.jd.com/mall/active/bXhWtPcq4Vh9LHDzPyz1uyjyjyi/index.html?babelChannel=ttt3">
                <img src="https://m.360buyimg.com/mobilecms/s250x200_jfs/t1/140456/37/16741/69120/60585711E4cff0446/fb6f80ac35fb36da.jpg!q70.jpg.dpg" alt="">
            </a>
        </div>
        <!-- 主导航区 -->
        <ul class="nav">
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-1.png" alt="">
                    <span>京东超市</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-2.png" alt="">
                    <span>数码电器</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-3.png" alt="">
                    <span>京东服饰</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-4.png" alt="">
                    <span>京东生鲜</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-5.png" alt="">
                    <span>京东到家</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-6.png" alt="">
                    <span>充值缴费</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-7.png" alt="">
                    <span>9.9元拼</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-8.png" alt="">
                    <span>领券</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-9.png" alt="">
                    <span>领金贴</span>
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="static/img/dh/nav-10.png" alt="">
                    <span>PLUS会员</span>
                </a>
            </li>
        </ul>
        <!-- 秒杀区 -->
        <div class="ms">
        </div>
        <!-- 商品列表区 -->
        <div class="tj">
            <h2 class="title">猜你喜欢</h2>
            <ul>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-1.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
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                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-2.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-3.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-4.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-5.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-6.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
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                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-8.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-1.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-2.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-3.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-4.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-5.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
                <li class="item">
                    <a href="">
                        <img src="static/img/sp/sp-7.webp" alt="">
                        <p>美的（Midea）电水壶热水壶电热水壶304不锈钢1.7L容量暖水壶烧水壶开水壶智能断电1705b</p>
                        <div class="price">
                            <span class="iconfont icon-rmb">79</span>
                            <div>看相似</div>
                        </div>
                    </a>
                </li>
            </ul>
        </div>
    </div>
    <!-- 页脚菜单栏 -->
    <div class="footer">
        <ul>
            <li>
                <span class="iconfont icon-home"></span>
                <span>首页</span>
            </li>
            <li>
                <span class="iconfont icon-layers"></span>
                <span>分类</span>
            </li>
            <li>
                <span class="iconfont icon-kehuguanli"></span>
                <span>京喜</span>
            </li>
            <li>
                <span class="iconfont icon-shopping-cart"></span>
                <span>登录</span>
            </li>
        </ul>
    </div>
</body>
</html>

reset.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
li {
    list-style: none;
}
a {
    color: white;
    text-decoration: none;
}
body {
    background-color: #f6f6f6;
}
/* 媒体查询 */
@media screen and (max-width: 480px) {
    html {
        font-size: 10px;
    }
}
@media screen and (min-width: 480px) {
    html {
        font-size: 12px;
    }
}
@media screen and (min-width: 640px) {
    html {
        font-size: 14px;
    }
}
@media screen and (min-width: 720px) {
    html {
        font-size: 16px;
    }
}

index.css

/* 引入初始化样式文件 */
@import 'reset.css';
/* 页眉 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    font-size: 1.4rem;
    color: white;
    height: 4.4rem;
    background-color: #e43130;
    z-index: 100;
}
/* 页脚*/
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    font-size: 1.4rem;
    color: #666;
    height: 4.4rem;
    background-color: #fafafa;
    box-shadow: 0 0 3px #999;
    z-index: 100;
}
/* 主体 */
.main {
    position: absolute;
    top: 4.4rem;
    bottom: 4.4rem;
    left: 0;
    right: 0;
    font-size: 1.4rem;
    min-width: 320px;
}

header.css

.header {
    display: flex;
    align-items: center;
}
/* 页眉中的三个部分比例 1:6:1 */
.header .login {
    color: #fff;
    text-align: center;
    flex: 1;
}
.header .menu {
    text-align: center;
    flex: 1;
    font-size: 2.5rem;
}
.header .search {
    flex: 6;
    padding: 0.5rem;
    background-color: #fff;
    border-radius: 3rem;
    display: flex;
}
/* logo  */
.header .search .logo {
    color: #e43130;
    flex: 0 1 4rem;
    font-size: 2rem;
    /* 水平垂直居中 */
    text-align: center;
    line-height: 2rem;
}
/* 放大镜 */
.header .search .zoom {
    color: #ccc;
    flex: 0 1 4rem;
    border-left: 1px solid;
    /* 水平垂直居中 */
    text-align: center;
    line-height: 2rem;
}
/* 搜索文本框 */
.header .search .words {
    flex: auto;
    border: none;
    outline: none;
    color: #aaa;
}

nav.css

.main .nav {
    padding: 1rem;
    display: flex;
    flex-flow: row wrap;
    justify-content: space-between;
    background: rgb(255, 255, 255);
    border-radius: 1rem;
    background-color: white;
    margin: 0 0.6rem;
}
.main .nav li {
    flex: 1 1 20%;
}
.main .nav li a {
    color: #7b7b7b;
    display: flex;
    flex-flow: column nowrap;
    align-items: center;
}
.main .nav li a img {
    height: 4rem;
    width: 4rem;
}

tj.css

.tj .title {
    height: 4rem;
    line-height: 4rem;
    color: #555;
    font-weight: 500;
    text-align: center;
    margin: 1rem 0;
}
.tj ul {
    font-size: 1rem;
    display: flex;
    flex-wrap: wrap;
    padding-bottom: 4.4rem;
}
.tj ul .item {
    padding: 1rem;
    flex: 1 1 calc(50% - 2rem);
    background-color: #fff;
    margin-left: 1rem;
    margin-bottom: 1rem;
}
.tj ul .item a img {
    width: 100%;
}
.tj ul .item a p {
    color: #555;
    line-height: 2rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.tj ul .item a .price {
    display: flex;
    justify-content: space-between;
    color: red;
}
.tj ul .item a .price div {
    color: grey;
    background-color: #f0f2f5;
    border-radius: .55rem;
    text-align: center;
    padding: 0.6rem;
    line-height: 1rem;
}

footer.css

.footer>ul {
    padding: 0.5rem;
    display: flex;
    justify-content: space-around;
    align-items: center;
}
.footer>ul>li {
    width: 20%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    cursor: pointer;
}
.footer>ul>li .iconfont {
    font-size: 2rem;
}

5.效果图

批改老师：

天蓬老师

批改状态：合格

老师批语：

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