前端案例：酷我音乐项目（移动端自适应）（HTML+CSS）

一个简单的移动端案例，模拟不同设备下逻辑分辨率不同，宽高自适应

正常打开整体布局

打开 f12 （ctrl + shift + M）或者点击左上角图标,将其模拟为移动端设备

在移动设备iPhone6/7/8，逻辑分辨率375的整体布局

头部和底部的安装使用了 position: fixed; 固定，让头部和底部安装不会随着页面的滚动而产出变化

banner区域没有js，简单点看个样式，所以这里就是一张图片，但是图片宽高与banner区域宽高不同，

为了避免图片挤压变形，使用了 object-fit: cover; 缩放img

移动设备iPhone6/7/8，逻辑分辨率375，其banner图尺寸

现在切换设备为iPad Pro，逻辑分辨率为1024，此设备下banner图尺寸自适应

再切换设备为iPhone 4，逻辑分辨率为320，此设备下banner图尺寸自适应

源码

HTML（index.html）代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>酷我音乐</title>
    <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
    <link rel="stylesheet" href="./iconfont/iconfont.css">
    <link rel="stylesheet" href="./css/index.css">
</head>
<body>
    <!-- 头部 -->
    <header>
        <div class="left"></div>
        <a href="#">下载APP</a>
    </header>

    <!-- 搜索 -->
    <div class="search">
        <div class="txt">
            <span class="iconfont icon-sousu2"></span>
            <span>搜索你想听的歌曲</span>
        </div>
    </div>

    <!-- banner -->
    <div class="banner">
        <ul>
            <li><a href="#"><img src="./assets/banner1.jpg" alt=""></a></li>
        </ul>
    </div>

    <!-- 排行榜 -->
    <div class="list">
        <!-- 标题 -->
        <div class="title">
            <h4>酷我排行榜</h4>
            <a href="#">更多<span class="iconfont icon-jiantou21"></span></a>
        </div>

        <!-- 内容 -->
        <div class="content">
            <ul>
                <li>
                    <div class="pic"><a href="https://m.kuwo.cn/newh5app/ranklist_detail/16"><img src="./assets/rank_hot.png" alt=""></a></div>
                    <div class="txt">
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/16" class="more">酷我热歌榜<span class="iconfont icon-jiantou21"></span></a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/16">1.有风无风皆自由(Live合唱版) - 王一佳</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/16">2.苹果香(黑大婶版) - 黑大婶回乡带娃</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/16">3.若月亮没来 (若是月亮还没来) - 王宇宙Leto&乔浚丞</a>
                    </div>
                </li>
                <li>
                    <div class="pic"><a href="https://m.kuwo.cn/newh5app/ranklist_detail/93"><img src="./assets/rank_rise.png" alt=""></a></div>
                    <div class="txt">
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/93" class="more">酷我飙升榜<span class="iconfont icon-jiantou21"></span></a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/93">1.童话镇 - 小野来了</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/93">2.她才是你的天赐良缘 - 任夏</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/93">3.空壳 - 周深</a>
                    </div>
                </li>
                <li>
                    <div class="pic"><a href="https://m.kuwo.cn/newh5app/ranklist_detail/17"><img src="./assets/rank_new.png" alt=""></a></div>
                    <div class="txt">
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/17" class="more">酷我新歌榜<span class="iconfont icon-jiantou21"></span></a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/17">1.适可而止 - 任夏</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/17">2.童话镇(新版) - 陈雪凝</a>
                        <a href="https://m.kuwo.cn/newh5app/ranklist_detail/17">3.见一面少一面 - 半吨兄弟</a>
                    </div>
                </li>
            </ul>
        </div>
    </div>
    
    <!-- 推荐歌单 -->
    <div class="recommend">
        <!-- 标题 -->
        <div class="title">
            <h4>推荐歌单</h4>
            <a href="#">更多<span class="iconfont icon-jiantou21"></span></a>
        </div>

        <!-- 内容 -->
        <div class="content">
            <ul>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/2996314807">
                        <div class="pic">
                                <img src="./assets/song01.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>1亿</div>
                        </div>
                        <div class="txt">经典老歌大放送！一人一首代表作！</div>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/3001661381">
                        <div class="pic">
                                <img src="./assets/song02.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>3713.5w</div>
                        </div>
                        <div class="txt">伤感情歌｜不眠夜里的孤单心事</div>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/2802745654">
                        <div class="pic">
                                <img src="./assets/song03.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>4144.6w</div>
                        </div>
                        <div class="txt">【经典国语】老男人的情怀老男人的歌</div>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/3360244412">
                        <div class="pic">
                                <img src="./assets/song04.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>1239.6w</div>
                        </div>
                        <div class="txt">抖音流行丨网红歌曲随身听</div>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/2539910244">
                        <div class="pic">
                                <img src="./assets/song05.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>2515.6w</div>
                        </div>
                        <div class="txt">【燃爆】抖音中俘虏你耳朵的英文歌曲</div>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/playlist_detail/2508547657">
                        <div class="pic">
                                <img src="./assets/song06.jpg" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>2810.6w</div>
                        </div>
                        <div class="txt">【伤感】对于你，我总是好了伤疤忘了疼</div>
                    </a>
                </li>
            </ul>
        </div>
    </div>

    <!-- 听书 -->
    <div class="listen">
        <!-- 标题 -->
        <div class="title">
            <h4>听书</h4>
            <a href="#">更多<span class="iconfont icon-jiantou21"></span></a>
        </div>

        <!-- 内容 -->
        <div class="content">
            <ul>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/radio_detail/10208722">
                        <div class="pic">
                                <img src="./assets/listen1.png" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>4208.7w</div>
                        </div>
                        <div class="txt">重温西游记，经典还是经典！</div>
                        <p>西游记影视剧原声续篇</p>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/radio_detail/15390775">
                        <div class="pic">
                                <img src="./assets/listen2.png" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>881.5w</div>
                        </div>
                        <div class="txt">岳云鹏孙越十大爆笑相声</div>
                        <p>岳云鹏孙越爆笑相声合辑</p>
                    </a>
                </li>
                <li>
                    <a href="https://m.kuwo.cn/newh5app/radio_detail/17972243">
                        <div class="pic">
                                <img src="./assets/listen3.png" alt="">
                            <div class="cover"><span class="iconfont icon-bofang"></span>486.7w</div>
                        </div>
                        <div class="txt">元芳，你怎么看？</div>
                        <p>狄仁杰探案集</p>
                    </a>
                </li>
            </ul>
        </div>
    </div>

    <!-- 下载 -->
    <div class="download">
        <img src="./assets/logo.jpg" alt="">
        <p>安装酷我音乐 发现更多好音乐</p>
        <span class="iconfont icon-jiantou21"></span>
    </div>

    <!-- 尾部 -->
    <div class="footer">
        <div class="bottomtop">
            <img src="./assets/logo.jpg" alt="">
            <p>酷我音乐</p>
        </div>
        <div class="agreement">
            <a href="#"><p>服务协议&nbsp;&nbsp;|&nbsp;&nbsp;</p></a>
            <a href="#"><p>隐私政策&nbsp;&nbsp;|&nbsp;&nbsp;</p></a>
            <a href="#"><p>用户权限&nbsp;&nbsp;|&nbsp;&nbsp;</p></a>
            <p>联系电话: (010)87939999</p>
        </div>
        <div class="version">
            <p>应用版本：10.7.0.0  开发者：北京酷我科技有限公司</p>
        </div>
        <div class="comInto">
            <a href="#">公司简介<span class="iconfont icon-jiantou21"></span></a>
        </div>
    </div>
</body>
</html>

CSS样式（index.css）代码：

样式是在 less 里面编+计算，然后导出为 index.css

*,
::after,
::before {
  box-sizing: border-box;
}
body,
ul,
ol,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  padding: 0;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, PingFangSC-Regular, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  color: #333;
}
a {
  color: #333;
  text-decoration: none;
  -webkit-tap-highlight-color: regb(0, 0, 0, 0);
}
ul {
  list-style-type: none;
}
li {
  list-style: none;
}
img {
  vertical-align: bottom;
}
body {
  background-color: #f9fafb;
}
header {
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  height: 13.32622601vw;
  background-color: #fff;
  box-shadow: 0px 4vw 3.6vw -5.067vw rgba(211, 220, 236, 0.77);
}
header .left {
  width: 55.97014925vw;
  height: 13.32622601vw;
  background: url(../assets/tophead.jpg);
  background-size: contain;
}
header a {
  margin-right: 3.9978678vw;
  width: 23.32089552vw;
  height: 7.99573561vw;
  background-color: #ffe31b;
  text-align: center;
  line-height: 7.99573561vw;
  border-radius: 3.9978678vw;
  font-size: 3.46481876vw;
  color: rgba(0, 0, 0, 0.8);
}
.search {
  margin-top: 13.32622601vw;
  padding: 2.6652452vw 3.9978678vw;
  height: 13.85927505vw;
}
.search .txt {
  height: 8.52878465vw;
  background-color: #f2f4f5;
  border-radius: 4.26439232vw;
  text-align: center;
  line-height: 8.52878465vw;
  color: #a1a4b3;
  font-size: 3.73134328vw;
}
.search .txt .iconfont {
  font-size: 5.06396588vw;
  margin-right: 0.26652452vw;
  vertical-align: bottom;
}
.banner {
  padding: 0 3.9978678vw;
  height: 28.78464819vw;
}
.banner ul li {
  width: 91.95095949vw;
  height: 28.78464819vw;
}
.banner ul li img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 2.13219616vw;
}
.list {
  margin-top: 5.33049041vw;
  margin-bottom: 7.99573561vw;
  padding: 0 3.9978678vw;
}
.list li {
  display: flex;
  margin-bottom: 4.26439232vw;
  height: 27.98507463vw;
  background-color: #fff;
  border-radius: 3.9978678vw;
}
.list li .pic {
  margin-right: 5.33049041vw;
}
.list li .pic img {
  width: 27.98507463vw;
  height: 27.98507463vw;
  border-radius: 3.9978678vw;
}
.list li .txt a {
  display: block;
  font-size: 3.19829424vw;
  color: #a1a4b3;
  line-height: 1.8;
  width: 55.97014925vw;
  text-wrap: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.list li .txt .more {
  font-size: 3.73134328vw;
  color: #333;
}
.list li .txt .more .iconfont {
  font-size: 4.26439232vw;
}
.title {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4.26439232vw;
  line-height: 6.66311301vw;
}
.title h4 {
  font-size: 5.33049041vw;
}
.title a {
  font-size: 3.19829424vw;
  color: #a1a4b3;
}
.title a .iconfont {
  font-size: 3.19829424vw;
}
.recommend {
  padding: 0 3.9978678vw;
  margin-bottom: 4.26439232vw;
}
.recommend ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.recommend ul li {
  margin-bottom: 4.26439232vw;
  width: 27.98507463vw;
  height: 38.1130064vw;
}
.recommend ul li .pic {
  position: relative;
  width: 27.98507463vw;
  height: 27.98507463vw;
}
.recommend ul li .pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 3.9978678vw;
}
.recommend ul li .pic .cover {
  position: absolute;
  bottom: 0;
  left: 0;
  padding: 0 2.6652452vw;
  height: 7.59594883vw;
  text-align: center;
  line-height: 7.59594883vw;
  color: #fff;
  font-size: 3.46481876vw;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: 0 3.9978678vw;
}
.recommend ul li .pic .cover .iconfont {
  font-size: 4.26439232vw;
  margin-right: 0.79957356vw;
}
.recommend ul li .txt {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  width: 26.65245203vw;
  height: 10.66098081vw;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 3.73134328vw;
}
.listen {
  padding: 0 3.9978678vw;
  margin-bottom: 4.79744136vw;
}
.listen ul {
  display: flex;
  justify-content: space-between;
}
.listen ul li {
  margin-bottom: 4.26439232vw;
  width: 27.98507463vw;
  height: 38.1130064vw;
}
.listen ul li .pic {
  position: relative;
  width: 27.98507463vw;
  height: 27.98507463vw;
}
.listen ul li .pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 3.9978678vw;
}
.listen ul li .pic .cover {
  position: absolute;
  bottom: 0;
  left: 0;
  padding: 0 2.6652452vw;
  height: 7.59594883vw;
  text-align: center;
  line-height: 7.59594883vw;
  color: #fff;
  font-size: 3.46481876vw;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: 0 3.9978678vw;
}
.listen ul li .pic .cover .iconfont {
  font-size: 4.26439232vw;
  margin-right: 0.79957356vw;
}
.listen ul li .txt {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  width: 26.65245203vw;
  height: 10.66098081vw;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 3.73134328vw;
}
.listen ul li p {
  font-size: 2.93176972vw;
  color: #a1a4b3;
  text-wrap: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.download {
  position: fixed;
  left: 7.99573561vw;
  bottom: 7.99573561vw;
  display: flex;
  align-items: center;
  padding: 0 2.6652452vw 0 4.79744136vw;
  width: 85.28784648vw;
  height: 11.99360341vw;
  border-radius: 6.79637527vw;
  background-color: #fff;
  box-shadow: 0.267vw 0 5.467vw 1px rgba(232, 235, 241, 0.73);
}
.download img {
  margin-right: 1.3326226vw;
  width: 9.86140725vw;
  height: 9.86140725vw;
}
.download p {
  flex: 1;
  font-weight: 700;
  font-size: 3.73134328vw;
}
.download .iconfont {
  width: 7.19616205vw;
  height: 7.19616205vw;
  background-color: #f2f4f5;
  border-radius: 50%;
  line-height: 7.19616205vw;
  text-align: center;
  font-weight: 700;
  font-size: 3.73134328vw;
}
.footer {
  margin-top: 15.45842217vw;
  margin-bottom: 28.67803838vw;
  height: 23.18763326vw;
  font-size: 2.93176972vw;
  text-align: center;
}
.footer .bottomtop {
  display: flex;
  justify-content: center;
  align-items: flex-end;
}
.footer .bottomtop img {
  width: 5.86353945vw;
  height: 6.26332623vw;
  vertical-align: bottom;
}
.footer .bottomtop p {
  font-size: 3.73134328vw;
  margin-left: 1.59914712vw;
}
.footer .agreement {
  margin-top: 2.53198294vw;
  display: flex;
  justify-content: center;
}
.footer .agreement a,
.footer .agreement p {
  color: #a1a4b3;
}
.footer .version {
  color: #a1a4b3;
  line-height: 5.33049041vw;
}
.footer .comInto a {
  color: #a1a4b3;
  line-height: 4.26439232vw;
}
.footer .comInto a .iconfont {
  font-size: 3.73134328vw;
}