京东首页移动端-web实战

设置视口标签以及引入初始化样式

    <link rel="stylesheet" href="./css/normalize.css">
    <link rel="stylesheet" href="./css/index.css">

body常用初始化样式

body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    background: #fff;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    line-height: 1.5;
    color: #666;
}

头部制作

  • 移动端宽度一般用百分比
  • 插入图片时记得设置图片的宽高
  • 图片默认与文字的基线对齐,所以设置垂直居中时,要给图片加上vertical-align:middle
ul {
    margin: 0;
    padding: 0;
}
ul li {
    list-style: none;
}
.app {
    height: 45px;
}

.app ul li {
    float: left;
    height: 45px;
    line-height: 45px;
    text-align: center;
    background-color: #333;
    color:#fff;
}
.app ul li:nth-child(1){
    width: 8%;
}
.app ul li:nth-child(1) img {
    width: 10px;
    vertical-align: middle;
}
.app ul li:nth-child(2){
    width: 10%;
}
.app ul li:nth-child(2) img {
    width: 30px;
    /* 图片与文字的基线默认对齐 */
    vertical-align: middle;

}
.app ul li:nth-child(3){
    width:  57%;
}
.app ul li:nth-child(4){
    width: 25%;
    background-color: #f63515;
}
    <header class="app">
        <ul>
            <li><img src="./images/close.png" alt=""></li>
            <li><img src="./images/logo.png" alt=""></li>
            <li>打开京东App,购物更轻松</li>
            <li>立即打开</li>
        </ul>
    </header>

 

 搜索框

  • 搜索框主体部分会随着页面宽度的变化而变化,左右两边的盒子宽度不变,故只需将左右两边盒子定位定宽定高,中间主体部分宽度百分百,之后再设置左右margin即可。
  • 京东后面的竖线可设置伪元素,记得转换伪元素为块级元素
  • 二倍精灵图要先将原图等比例缩放至原来的一半,之后根据改变之后的图片测量坐标,同时background-size变为原来精灵图宽度的一半,高度auto
  • 图片在搜索区域下方显示,将搜索区域设置为固定定位,一定要设置宽度,宽度100%

    <div class="search-wrap">
        <div class="search-btn"></div>
        <div class="search">
            <div class="jd-icon"></div>
            <div class="sou"></div>
        </div>
        <div class="search-login">登录</div>
    </div>
    <!-- 主体内容部分 -->
    <div class="main-content">
        <!-- 滑动图 -->
        <div class="slider">
            <img src="./upload/banner.dpg" alt="">
        </div>
    </div>
/* 搜索 */
.search-wrap {
    width: 100%;
    position: fixed;
    height: 44px;
    /* 解决外边距合并问题 */
    overflow: hidden;
    max-width: 640px;
    min-width: 320px;
}

.search-btn {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}
.search-btn::before{
    content: "";
    /* 伪元素为行内元素 */
    display: block;
    width: 20px;
    height: 18px;
    background: url(../images/s-btn.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}

.search-login {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    color:#fff;
    text-align: center;
    line-height: 44px;
}

.search {
    position: relative;
    height: 30px;
    margin: 7px 50px;
    border-radius: 15px;
    background-color: #fff;
}
.jd-icon {
    width: 20px;
    height: 15px;
    position: absolute;
    top: 8px;
    left: 13px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after {
    content: "";
    position: absolute;
    right: -8px;
    display: block;
    width: 1px;
    height: 15px;
    background-color: #f63515;
}
.sou {
    position: absolute;
    top: 8px;
    left: 50px;
    width: 18px;
    height: 15px;
    /*二倍精灵图*/
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto;
}
.slider img {
    width: 100%;
}

品牌日

  • 由三张图片组成,每个图片均为一个链接
  • div里的每张图片宽度均为三分之一,即33.33%
  • 给brand加圆角边框时,记得要溢出隐藏,因为图片并未设置圆角边框
  • 上面图片底部有缝隙,去除图片底部缝隙只需给图片加上vertical-align:top;
  • 每个div浮动即可

        <div class="brand">
            <div>
                <a href=""><img src="./upload/pic11.dpg" alt=""></a>
            </div>
            <div>
                <a href=""><img src="./upload/pic22.dpg" alt=""></a>
            </div>
            <div>
                <a href=""><img src="./upload/pic33.dpg" alt=""></a>
            </div>
        </div>
.brand {
    border-radius: 10px 10px 0 0;
    overflow: hidden;
}
.brand div {
    float:left;
    width: 33.33%;
}
.brand div img {
    width: 100%;
}

图片格式

  • DPG图片压缩技术

京东自主研发推出DPG图片压缩技术,经测试该技术,可直接节省用户近50%的浏览流量,极大的提升了用户的网页打开速度。能够兼容jpeg,实现全平台、全部浏览器的兼容支持,经过内部和外部上万张图片的人眼浏览测试后发现,压缩后的图片和webp的清晰度对比没有差距。

  • webp图片格式

谷歌开发的一种旨在加快图片加载速度的图片格式。图片压缩体积大约只有JPEG的2/3,并能节省大量的服务器宽带资源和数据空间
 

 导航栏

  • nav里10个a,a里有图片和文字
  • 将a浮动起来,且每个a宽度占20%,设置a里的内容水平居中即可
  • 适当设置nav与其他元素的距离

        <nav>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
        </nav>
nav {
    padding-top: 5px;
}
nav a {
    float: left;
    width: 20%;
    text-align: center;
}

nav a img {
    width: 40px;
    margin: 10px 0;
}
nav a span {
    display: block;
}

 新闻模块

  • 三张图片,均浮动,a里面包括一张图片
  • 给每个a设置宽度,里面的图片百分百即可
  • 因为后两张图片有边框,为了不影响布局,应该让a元素变成CSS3模型(box-sizing:border-box)这样最后一张图片就不会挤下去

        <div class="news clearfix">
            <a href="">
                <img src="./upload/new1.dpg" alt="">
            </a>
            <a href="">
                <img src="./upload/new2.dpg" alt="">
            </a>
            <a href="">
                <img src="./upload/new3.dpg" alt="">
            </a>
        </div>

 

.news {
    margin-top: 20px;
}
.news a:nth-child(1) {
    width: 50%;
}
.news a {
    float: left;
    box-sizing: border-box;
}
.news a:nth-child(n+2) {
    width: 25%;
    border-left: 1px solid #ccc;
}
.news a img {
    width: 100%;
}

整体代码:

 

body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    /* 当前文字的1.5倍 */
    line-height: 1.5;
    color: #666;
}

.clearfix::after {
    content: "";
    display: block;
    clear: both;
}

a {
    color: #666;
    text-decoration: none;
}

ul {
    margin: 0;
    padding: 0;
}

img {
    /* 去除图片底部的缝隙 */
    vertical-align: top;
}

ul li {
    list-style: none;
}

.app {
    height: 45px;
}

.app ul li {
    float: left;
    height: 45px;
    line-height: 45px;
    text-align: center;
    background-color: #333;
    color: #fff
}

.app ul li:nth-child(1) {
    width: 8%;
}

.app ul li:nth-child(1) img {
    width: 10px;
    vertical-align: middle;
}

.app ul li:nth-child(2) {
    width: 10%;
}

.app ul li:nth-child(2) img {
    width: 30px;
    /* 图片与文字的基线默认对齐 */
    vertical-align: middle;

}

.app ul li:nth-child(3) {
    width: 57%;
}

.app ul li:nth-child(4) {
    width: 25%;
    background-color: #f63515;
}

/* 搜索 */
.search-wrap {
    width: 100%;
    position: fixed;
    height: 44px;
    /* 解决外边距合并问题 */
    overflow: hidden;
    max-width: 640px;
    min-width: 320px;
}

.search-btn {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}

.search-btn::before {
    content: "";
    /* 伪元素为行内元素 */
    display: block;
    width: 20px;
    height: 18px;
    background: url(../images/s-btn.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}

.search-login {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    color: #fff;
    text-align: center;
    line-height: 44px;
}

.search {
    position: relative;
    height: 30px;
    margin: 7px 50px;
    border-radius: 15px;
    background-color: #fff;
}

.jd-icon {
    width: 20px;
    height: 15px;
    position: absolute;
    top: 8px;
    left: 13px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}

.jd-icon::after {
    content: "";
    position: absolute;
    right: -8px;
    display: block;
    width: 1px;
    height: 15px;
    background-color: #f63515;
}

.sou {
    position: absolute;
    top: 8px;
    left: 50px;
    width: 18px;
    height: 15px;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto;
}

.slider img {
    width: 100%;
}

.brand {
    border-radius: 10px 10px 0 0;
    overflow: hidden;
}

.brand div {
    float: left;
    width: 33.33%;
}

.brand div img {
    width: 100%;
}

nav {
    padding-top: 5px;
}

nav a {
    float: left;
    width: 20%;
    text-align: center;
}

nav a img {
    width: 40px;
    margin: 10px 0;
}

nav a span {
    display: block;
}

/* news */
.news {
    margin-top: 20px;
}

.news a:nth-child(1) {
    width: 50%;
}

.news a {
    float: left;
    box-sizing: border-box;
}

.news a:nth-child(n+2) {
    width: 25%;
    border-left: 1px solid #ccc;
}

.news a img {
    width: 100%;
}
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1.0, user-scalable=no,maximum-scale=1.0, minimum-scale=1.0">
    <title>Document</title>
    <!-- 引入初始化样式 -->
    <link rel="stylesheet" href="./css/normalize.css">
    <link rel="stylesheet" href="./css/index.css">
</head>

<body>
    <!-- 顶部 -->
    <header class="app">
        <ul>
            <li><img src="./images/close.png" alt=""></li>
            <li><img src="./images/logo.png" alt=""></li>
            <li>打开京东App,购物更轻松</li>
            <li>立即打开</li>
        </ul>
    </header>
    <!-- 搜索 -->
    <div class="search-wrap">
        <div class="search-btn"></div>
        <div class="search">
            <div class="jd-icon"></div>
            <div class="sou"></div>
        </div>
        <div class="search-login">登录</div>
    </div>
    <!-- 主体内容部分 -->
    <div class="main-content">
        <!-- 滑动图 -->
        <div class="slider">
            <img src="./upload/banner.dpg" alt="">
        </div>
        <!-- 品牌日 -->
        <div class="brand">
            <div>
                <a href=""><img src="./upload/pic11.dpg" alt=""></a>
            </div>
            <div>
                <a href=""><img src="./upload/pic22.dpg" alt=""></a>
            </div>
            <div>
                <a href=""><img src="./upload/pic33.dpg" alt=""></a>
            </div>
        </div>
        <!-- nav部分 -->
        <nav class="clearfix">
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
            <a href=""><img src="./upload/nav1.webp" alt="">
                <span>京东超市</span></a>
        </nav>
        <!-- 新闻模块 -->
        <div class="news clearfix">
            <a href="">
                <img src="./upload/new1.dpg" alt="">
            </a>
            <a href="">
                <img src="./upload/new2.dpg" alt="">
            </a>
            <a href="">
                <img src="./upload/new3.dpg" alt="">
            </a>
        </div>
    </div>
</body>

</html>

 

 

之后的布局以及样式都与上面大致相同,京东移动端的练习就先到这里啦 

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