访问地址

https://youthddup.gitee.io/myproject/

1、项目目录结构

在这里插入图片描述

2、注意

（1）设置视口标签以及引入初始化样式
（2）二倍精灵图缩放
先把精灵图等比缩放原来的一半
然后再测精灵图位置
代码里background-size置为原来的一半
（3）图片img嵌套在一个div里
（4）固定定位，要给定宽度-实现滑动时搜索栏在顶部固定
（5）轮播图制作
下载官方js和css文件并引入Index.html中

<head>
<!-- Link Swiper's CSS -->
  <link rel="stylesheet" href="./css/swiper.min.css">
</head>
<body>
  <!-- js放在body最后边是为了避免阻塞文档，js是从上往下编译的 -->
    <script src="./js/swiper.min.js"></script>
</body>
```html
/* 搜索 */
.search_wrap{
    width: 100%;
    height: 45px;
    position: fixed;
    /* 处理父子外边距合并 */
    overflow: hidden;
    min-width: 320px;
    max-width: 640px;
}

（5）浮动是行内元素也可以用a
（6）图片格式
DPG图片压缩技术，京东自主研发，可以节省50%的浏览浏览，提升网页加载速度
webp:谷歌研发，可以压缩图片体积为JPEG的三分之二

3、代码

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, user-scalable=no">
    <link rel="stylesheet" href="./css/normalize.css">
    <link rel="stylesheet" href="./css/index.css">
    <title>Document</title>
</head>
<body>
    <!-- 顶部引导栏 -->
    <header class="app">
        <ul>
            <li><img src="./images/jd_close.png" alt=""></li>
            <li><img src="./images/jdicon.png" alt=""></li>
            <li>打开京东APP,购物实惠又轻松</li>
            <li>立即打开</li>
        </ul>
    </header>
    <!-- 搜索区域 -->
    <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">登陆</div>
    </div>
    <!-- 内容主体 -->
    <div class="main-content">
        <div class="slider">
            <img src="./upload/banner.dpg" alt="">
        </div>
        <!-- .品牌日活动 -->
        <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>
        <!-- 导航栏 -->
        <nav>
            <a href="#">
                <img src="./upload/nav1.webp" alt="">
                <span>京东超市</span>
            </a>
            <a href="#">
                <img src="./upload/nav2.webp" alt="">
                <span>全球购</span>
            </a>
            <a href="#">
                <img src="./upload/nav3.webp" alt="">
                <span>京东充值</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>
    </div>
    <!-- 新闻快报 -->
    <div class="news">
        <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>

</body>
</html>

index.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* 链接点击高亮的效果删除 */
    -webkit-tap-highlight-color: transparent;
}
/* ios移动端按钮和输入框自定义样式的话，需要添加 */
input{
    -webkit-appearance:none;
}
/* 禁用长按页面弹出菜单 */
a,img{
    -webkit-touch-callout: none;
}

a{
    text-decoration: none;

}
img{
    vertical-align: middle;
}
body{
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    color: #666;
    font-family: -apple-system, Helvetica, sans-serif;
    line-height: 1.5;
}
.app{
    height: 45px;
}
ul{
    list-style: none;
}
.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%;
    text-align: center;
    line-height: 45px;
}
.app ul li:nth-child(1) img{
    width: 16px;
    vertical-align: middle;
}
.app ul li:nth-child(2){
    width: 10%;
    line-height: 45px;
    text-align: center;
}
.app ul li:nth-child(2) img{
    width: 30px;
    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%;
    height: 45px;
    position: fixed;
    /* 处理父子外边距合并 */
    overflow: hidden;
    min-width: 320px;
    max-width: 640px;
}
.search_wrap .search_btn{
    position: absolute;
    top:0;
    left:0;
    width: 40px;
    height: 45px;
}
.search_btn::before{
    content: "";
    display: block;
    margin: 14px 0 0 15px;
    width: 20px;
    height: 18px;
    background: url(../images/s-btn.png) no-repeat;
    background-size: 20px 18px;
}
.search_login{
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 45px;
    line-height: 45px;
}

.search{
    position: relative;
    height: 30px;
    margin: 0 50px;
    margin-top: 7px;
    border-radius:15px ;
    background-color: #fff;
}
.jd-icon{
    position: absolute;
    top:8px;
    left: 13px;
    width: 20px;
    height: 15px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after{
    content: '';
    position: absolute;
    left:24px;
    display: block;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}
.sou{
    position: absolute;
    top:8px;
    left:50px;
    width: 18px;
    height: 15px;
    background-color: #F63515;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto;
}
.slider img{
    width: 100%;
}
/* 活动日 */
.brand{
    border-radius: 10px 10px 0 0;
    /* 盒子切了圆角，但图片没有切，所以让图片超出盒子的区域隐藏 */
    overflow: hidden;
}
.brand div{
    float: left;
    width: 33.33%;
}
.brand div img{
    width: 100%;

}
/* 导航栏nav */
nav{
    padding-top: 5px;
}
nav a{
    float: left;
    width: 20%;
    text-align: center;
    color: #666;

}
nav a img{
    width: 40px;
    margin: 10px 0;
}
nav a span{
    display: block;
}
/* 快报模块 */
.news{
    margin-top: 20px;
}
.news a{
    float: left;
}
.news img{
    width: 100%;
}
.news a:nth-child(1){
    width: 50%;
}
.news a:nth-child(n+2){
    width: 25%;
    border-left: 1px solid #ccc;
}

normalize.css

/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */

/**
 * 1. Change the default font family in all browsers (opinionated).
 * 2. Correct the line height in all browsers.
 * 3. Prevent adjustments of font size after orientation changes in
 *    IE on Windows Phone and in iOS.
 */

/* Document
   ========================================================================== */

html {
  font-family: sans-serif; /* 1 */
  line-height: 1.15; /* 2 */
  -ms-text-size-adjust: 100%; /* 3 */
  -webkit-text-size-adjust: 100%; /* 3 */
}

/* Sections
   ========================================================================== */

/**
 * Remove the margin in all browsers (opinionated).
 */

body {
  margin: 0;
}

/**
 * Add the correct display in IE 9-.
 */

article,
aside,
footer,
header,
nav,
section {
  display: block;
}

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */

h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

/* Grouping content
   ========================================================================== */

/**
 * Add the correct display in IE 9-.
 * 1. Add the correct display in IE.
 */

figcaption,
figure,
main { /* 1 */
  display: block;
}

/**
 * Add the correct margin in IE 8.
 */

figure {
  margin: 1em 40px;
}

/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */

hr {
  box-sizing: content-box; /* 1 */
  height: 0; /* 1 */
  overflow: visible; /* 2 */
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */

pre {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/* Text-level semantics
   ========================================================================== */

/**
 * 1. Remove the gray background on active links in IE 10.
 * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
 */

a {
  background-color: transparent; /* 1 */
  -webkit-text-decoration-skip: objects; /* 2 */
}

/**
 * Remove the outline on focused links when they are also active or hovered
 * in all browsers (opinionated).
 */

a:active,
a:hover {
  outline-width: 0;
}

/**
 * 1. Remove the bottom border in Firefox 39-.
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */

abbr[title] {
  border-bottom: none; /* 1 */
  text-decoration: underline; /* 2 */
  text-decoration: underline dotted; /* 2 */
}

/**
 * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
 */

b,
strong {
  font-weight: inherit;
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */

b,
strong {
  font-weight: bolder;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */

code,
kbd,
samp {
  font-family: monospace, monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/**
 * Add the correct font style in Android 4.3-.
 */

dfn {
  font-style: italic;
}

/**
 * Add the correct background and color in IE 9-.
 */

mark {
  background-color: #ff0;
  color: #000;
}

/**
 * Add the correct font size in all browsers.
 */

small {
  font-size: 80%;
}

/**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/* Embedded content
   ========================================================================== */

/**
 * Add the correct display in IE 9-.
 */

audio,
video {
  display: inline-block;
}

/**
 * Add the correct display in iOS 4-7.
 */

audio:not([controls]) {
  display: none;
  height: 0;
}

/**
 * Remove the border on images inside links in IE 10-.
 */

img {
  border-style: none;
}

/**
 * Hide the overflow in IE.
 */

svg:not(:root) {
  overflow: hidden;
}

/* Forms
   ========================================================================== */

/**
 * 1. Change the font styles in all browsers (opinionated).
 * 2. Remove the margin in Firefox and Safari.
 */

button,
input,
optgroup,
select,
textarea {
  font-family: sans-serif; /* 1 */
  font-size: 100%; /* 1 */
  line-height: 1.15; /* 1 */
  margin: 0; /* 2 */
}

/**
 * Show the overflow in IE.
 * 1. Show the overflow in Edge.
 */

button,
input { /* 1 */
  overflow: visible;
}

/**
 * Remove the inheritance of text transform in Edge, Firefox, and IE.
 * 1. Remove the inheritance of text transform in Firefox.
 */

button,
select { /* 1 */
  text-transform: none;
}

/**
 * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 *    controls in Android 4.
 * 2. Correct the inability to style clickable types in iOS and Safari.
 */

button,
html [type="button"], /* 1 */
[type="reset"],
[type="submit"] {
  -webkit-appearance: button; /* 2 */
}

/**
 * Remove the inner border and padding in Firefox.
 */

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

/**
 * Restore the focus styles unset by the previous rule.
 */

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

/**
 * Change the border, margin, and padding in all browsers (opinionated).
 */

fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em;
}

/**
 * 1. Correct the text wrapping in Edge and IE.
 * 2. Correct the color inheritance from `fieldset` elements in IE.
 * 3. Remove the padding so developers are not caught out when they zero out
 *    `fieldset` elements in all browsers.
 */

legend {
  box-sizing: border-box; /* 1 */
  color: inherit; /* 2 */
  display: table; /* 1 */
  max-width: 100%; /* 1 */
  padding: 0; /* 3 */
  white-space: normal; /* 1 */
}

/**
 * 1. Add the correct display in IE 9-.
 * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */

progress {
  display: inline-block; /* 1 */
  vertical-align: baseline; /* 2 */
}

/**
 * Remove the default vertical scrollbar in IE.
 */

textarea {
  overflow: auto;
}

/**
 * 1. Add the correct box sizing in IE 10-.
 * 2. Remove the padding in IE 10-.
 */

[type="checkbox"],
[type="radio"] {
  box-sizing: border-box; /* 1 */
  padding: 0; /* 2 */
}

/**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */

[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto;
}

/**
 * 1. Correct the odd appearance in Chrome and Safari.
 * 2. Correct the outline style in Safari.
 */

[type="search"] {
  -webkit-appearance: textfield; /* 1 */
  outline-offset: -2px; /* 2 */
}

/**
 * Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
 */

[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

/**
 * 1. Correct the inability to style clickable types in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */

::-webkit-file-upload-button {
  -webkit-appearance: button; /* 1 */
  font: inherit; /* 2 */
}

/* Interactive
   ========================================================================== */

/*
 * Add the correct display in IE 9-.
 * 1. Add the correct display in Edge, IE, and Firefox.
 */

details, /* 1 */
menu {
  display: block;
}

/*
 * Add the correct display in all browsers.
 */

summary {
  display: list-item;
}

/* Scripting
   ========================================================================== */

/**
 * Add the correct display in IE 9-.
 */

canvas {
  display: inline-block;
}

/**
 * Add the correct display in IE.
 */

template {
  display: none;
}

/* Hidden
   ========================================================================== */

/**
 * Add the correct display in IE 10-.
 */

[hidden] {
  display: none;
}