web-flex布局案例：携程

index.html:

<!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,maximum-scale=1.0,minimum-scale=1.0">
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/index.css">
    <title>携程在手，天下我有</title>
</head>

<body>
    <!-- 顶部搜索模块 -->
    <div class="search-index">
        <div class="search">搜索：目的地/酒店/航班号</div>
        <a href="#" class="user">我 的</a>
    </div>
    <!-- 焦点图模块 -->
    <div class="focus">
        <img src="./upload/focus.jpg" alt="">
    </div>
    <!-- 局部导航栏 -->
    <ul class="local-nav">
        <li>
            <a href="#" title="景点·玩乐">
                <span class="local-nav-icon-icon1"></span>
                <span>景点·玩乐</span>
            </a>
        </li>
        <li>
            <a href="#" title="景点·玩乐">
                <span class="local-nav-icon-icon2"></span>
                <span>周边游</span>
            </a>
        </li>
        <li>
            <a href="#" title="景点·玩乐">
                <span class="local-nav-icon-icon3"></span>
                <span>美食林</span>
            </a>
        </li>
        <li>
            <a href="#" title="景点·玩乐">
                <span class="local-nav-icon-icon4"></span>
                <span>一日游</span>
            </a>
        </li>
        <li>
            <a href="#" title="景点·玩乐">
                <span class="local-nav-icon-icon5"></span>
                <span>当地攻略</span>
            </a>
        </li>
    </ul>
    <!-- 主导航栏 -->
    <nav>
        <div class="nav-common">
            <div class="nav-items">
                <a href="#">海外酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
        </div>
        <div class="nav-common">
            <div class="nav-items">
                <a href="#">海外酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
        </div>
        <div class="nav-common">
            <div class="nav-items">
                <a href="#">海外酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
            <div class="nav-items">
                <a href="#">海外酒店</a>
                <a href="#">特价酒店</a>
            </div>
        </div>
    </nav>
    <!-- 侧导航栏 -->
    <ul class="subnav-entry">
        <li>
            <a href="#">
                <span class="subnav-entry-icon1"></span>
                <span>WiFi电话卡</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon2"></span>
                <span>保险·签证</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon3"></span>
                <span>外币兑换</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon4"></span>
                <span>购物</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon5"></span>
                <span>当地向导</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon6"></span>
                <span>自由行</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon7"></span>
                <span>境外玩乐</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon8"></span>
                <span>礼品卡</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon9"></span>
                <span>信用卡</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon10"></span>
                <span>更多</span>
            </a>
        </li>
    </ul>
    <!-- 销售模块 -->
    <div class="sales-box">
        <div class="sales-hd">
            <h2>热门活动</h2>
            <a href="#" class="more">获取更多福利</a>
        </div>
        <div class="sales-bd">
            <div class="row">
                <a href="#">
                    <img src="./upload/pic1.jpg" alt="">
                </a>
                <a href="#">
                    <img src="./upload/pic2.jpg" alt="">
                </a>
            </div>
            <div class="row">
                <a href="#">
                    <img src="./upload/pic3.jpg" alt="">
                </a>
                <a href="#">
                    <img src="./upload/pic4.jpg" alt="">
                </a>
            </div>
            <div class="row">
                <a href="#">
                    <img src="./upload/pic5.jpg" alt="">
                </a>
                <a href="#">
                    <img src="./upload/pic6.jpg" alt="">
                </a>
            </div>
        </div>
    </div>
</body>

</html>

index.css:

body {
    max-width: 540px;
    min-width: 320px;
    margin: 0 auto;
    font: normal 14px/1.5 Tahoma, "Lucida Grande", Verdana, "Microsoft Yahei", STXihei, hei;
    color: #000;
    background: #f2f2f2;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    color: #222;
}

div {
    box-sizing: border-box;
}


/* 搜索模块 */

.search-index {
    display: flex;
    /* 固定定位跟父级没有关系，它以屏幕为准 */
    position: fixed;
    top: 0;
    /* 让盒子实现水平居中对齐 如果不给left值（下面两行代码）也是能实现水平居中的 */
    left: 50%;
    /* 兼容性写法 */
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    /* 固定定位的盒子一定要写宽度 */
    width: 100%;
    min-width: 320px;
    max-width: 540px;
    height: 44px;
    background-color: #f6f6f6;
    border-top: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

.search {
    position: relative;
    height: 26px;
    line-height: 24px;
    border: 1px solid #ccc;
    flex: 1;
    font-size: 12px;
    color: #666;
    margin: 7px 10px;
    padding-left: 25px;
    border-radius: 5px;
    /* 加阴影: 水平 垂直 模糊 rgba*/
    box-shadow: 0 2px 4px rgba(0, 0, 0, .2);
}

.search::before {
    content: "";
    /* 不转化成块级元素 因为会把文字挤到下一行 使用用绝对定位来实现方位设置 */
    position: absolute;
    top: 5px;
    left: 5px;
    width: 15px;
    height: 15px;
    background: url(../images/sprite.png) no-repeat -59px -279px;
    background-size: 104px auto;
}

.user {
    width: 44px;
    height: 44px;
    font-size: 12px;
    text-align: center;
    color: #2eaae0;
}

.user::before {
    content: "";
    /* 转化成块级元素才有大小 */
    display: block;
    width: 23px;
    height: 23px;
    background: url(../images/sprite.png) no-repeat -59px -194px;
    /* 精灵图缩放 */
    background-size: 104px auto;
    margin: 4px auto -2px;
}


/* focus */

.focus {
    padding-top: 44px;
}

.focus img {
    width: 100%;
}


/* 局部导航栏 */

.local-nav {
    display: flex;
    height: 64px;
    background-color: #fff;
    margin: 3px 4px;
    border-radius: 8px;
}

.local-nav li {
    flex: 1;
}

.local-nav a {
    display: flex;
    flex-direction: column;
    /* 侧轴居中对齐 因为是单行*/
    align-items: center;
    font-size: 12px;
}

.local-nav li [class^="local-nav-icon"] {
    width: 32px;
    height: 32px;
    margin-top: 8px;
    background: url(../images/localnav_bg.png) no-repeat 0 0;
    background-size: 32px auto;
}

.local-nav li .local-nav-icon-icon2 {
    background-position: 0 -32px;
}

.local-nav li .local-nav-icon-icon3 {
    background-position: 0 -64px;
}

.local-nav li .local-nav-icon-icon4 {
    background-position: 0 -96px;
}

.local-nav li .local-nav-icon-icon5 {
    background-position: 0 -128px;
}


/* nav */

nav {
    overflow: hidden;
    border-radius: 8px;
    margin: 0 4px 3px;
}

.nav-common {
    display: flex;
    height: 88px;
}

.nav-common:nth-child(1) {
    background: -webkit-linear-gradient(left, #FA5A55, #FA994D);
}

.nav-common:nth-child(2) {
    margin: 3px 0;
    background: -webkit-linear-gradient(left, #4B90ED, #53BCED);
}

.nav-common:nth-child(3) {
    background: -webkit-linear-gradient(left, #34C2A9, #6CD559);
}

.nav-items {
    /* 一个盒子既设置flex又设置display是不冲突的 相当于儿子既可以有父亲又可以有他的儿子 */
    flex: 1;
    display: flex;
    flex-direction: column;
}

.nav-items a {
    flex: 1;
    text-align: center;
    line-height: 44px;
    color: #fff;
    font-size: 14px;
    /* 加文字阴影 */
    text-shadow: 1px 1px rgba(0, 0, 0, .2);
}

.nav-items a:nth-child(1) {
    border-bottom: 1px solid #fff;
}


/* 第一列里的a(单独的那个a)是不需要下边框的 */

.nav-items:nth-child(1) a {
    border: 0;
    background: url(../images/hotel.png) no-repeat bottom center;
    background-size: 121px auto;
}


/* -n+2就是前面两个 */

.nav-items:nth-child(-n+2) {
    border-right: 1px solid #fff;
}


/* 侧导航栏subnav-entry */

.subnav-entry {
    display: flex;
    border-radius: 8px;
    background-color: #fff;
    margin: 0 4px;
    /* 设置换行 */
    flex-wrap: wrap;
    padding: 5px 0;
    box-shadow: 1px 0 2px #ccc, 0 1px 2px #ccc;
}

.subnav-entry li {
    /* 里面的子盒子可以写% ,是相对于父级来说的*/
    flex: 20%;
}

.subnav-entry a {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.subnav-entry li [class^="subnav-entry-icon"] {
    width: 28px;
    height: 28px;
    background-color: pink;
    margin-top: 4px;
    background: url(../images/subnav-bg.png) no-repeat;
    background-size: 28px auto;
}

.subnav-entry li .subnav-entry-icon2 {
    background-position: 0 -28px;
}

.subnav-entry li .subnav-entry-icon3 {
    background-position: 0 -60px;
}

.subnav-entry li .subnav-entry-icon4 {
    background-position: 0 -98px;
}

.subnav-entry li .subnav-entry-icon5 {
    background-position: 0 -130px;
}

.subnav-entry li .subnav-entry-icon6 {
    background-position: 3px -162px
}

.subnav-entry li .subnav-entry-icon7 {
    background-position: 0 -197px;
}

.subnav-entry li .subnav-entry-icon8 {
    background-position: 0 -229px;
}

.subnav-entry li .subnav-entry-icon9 {
    background-position: 0 -258px;
}

.subnav-entry li .subnav-entry-icon10 {
    background-position: 5px -287px;
}

.sales-box {
    border-top: 1px solid #bbb;
    background-color: #fff;
    margin: 4px;
}

.sales-hd {
    position: relative;
    height: 44px;
    border-bottom: 1px solid #ccc;
}

.sales-hd h2 {
    position: relative;
    /* text-indent 属性规定文本块中首行文本的缩进 */
    text-indent: -999px;
    overflow: hidden;
}

.sales-hd h2::after {
    position: absolute;
    top: 8px;
    left: 20px;
    content: "";
    width: 79px;
    height: 15px;
    background: url(../images/hot.png) no-repeat 0 -20px;
    background-size: 79px auto;
}

.more {
    position: absolute;
    right: 5px;
    top: 0;
    background: -webkit-linear-gradient(left, #ff506c, #ff6bc6);
    border-radius: 15px;
    padding: 3px 20px 3px 10px;
    color: #fff;
}

.more::after {
    content: "";
    position: absolute;
    top: 9px;
    right: 9px;
    width: 7px;
    height: 7px;
    border-top: 2px solid #fff;
    border-right: 2px solid #fff;
    transform: rotate(45deg);
}

.row {
    display: flex;
}

.row a {
    flex: 1;
    border-bottom: 1px solid #eee;
}

.row a:nth-child(1) {
    border-right: 1px solid #eee;
}

.row a img {
    width: 100%;
}

运行效果：

web-flex布局案例：携程

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