CSS移动端弹性布局

一级标题

二倍图

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>背景图片</title>
    <style>
        div{
            width: 500px;
            height: 500px;
            border: 2px solid red;
            background: url(../images/01.jpg) no-repeat;
            /* background-size: 500px 200px; */
            /* cover要完全覆盖div盒子，可能有部分背景图片显示不全 */
            background-size: cover;
            /* contain高度和宽度等比例拉伸 当宽度或者高度铺面div盒子就不再进行拉伸了 可能有部分空白区域*/
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

css初始化normalize.css

npm install normalize.css

盒子模型box-sizing
在这里插入图片描述

<style>
        div:nth-child(1){
            /* 有这句话padding和border不会撑大盒子了，让盒子变成css3盒子模型 */
            box-sizing: border-box;
            width: 200px;
            height: 200px;
            background-color: purple;
            padding: 10px;
            border: 10px solid blue;
        }
    </style>

特殊样式

<style>
       /* 去除高亮 */
       a{
        -webkit-tap-highlight-color:transparent;
       }
       /* 去除外观效果 */
       input{
        -webkit-appearance:nane;
       }

       /* 禁用长按页面时弹出菜单 */
       /* img,a{-webkit-touch-callout:none;} */
    </style>
</head>
<body>
    <a href="#">黑马</a>
    <input type="button" value="按钮">
</body>

流式布局

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>流式布局</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        section{
            width: 100%;
            max-width: 980px;
            min-width: 320px;
        }
        section div{
            float: left;
            width: 50%;
            height: 400px;
        }
        section div:nth-child(1){
            background-color: pink;
        }
        section div:nth-child(2){
            background-color: purple;
        }
       
    </style>
</head>
<body>
    <section>
        <div></div>
        <div></div>
    </section>
</body>
</html>

二级标题

弹性布局

<!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,minimun-scale=1.0">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <style>
       div{
        display: flex;
        width: 80%;
        height: 300px;
        background-color: pink;
        justify-content: space-around;
       }
       div span{
        width: 150px;
        height: 100px;
        background-color: purple;
        margin-left: 5px;
        flex:1;
       }
       
    </style>
</head>
<body>
    <div>
        <span>1</span>
        <span>2</span>
        <span>3</span>
    </div>

</body>
</html>

父项属性
在这里插入图片描述
主轴

简写

三级标题

子项属性
flex属性定义子项目分配剩余空间，用flex来表示占多少份数

flex:number;

align-self控制子项自己在侧轴上的排列方式

span:nth-child(2){
	align-self:flex-end;
}

order属性定义项目的排列顺序，越小越靠前
默认是0，取-1比0小所以在前面

四级标题

携程网首页案例
线性渐变
在这里插入图片描述

效果图

HTML

<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="../css/normalize.css">
    <link rel="stylesheet" href="../css/index.css">
    <title>携程在手，说走就走</title>
</head>
 
<body>
    <!-- 顶部搜索 -->
    <div class="search-index">
        <div class="search">搜索:目的地/酒店/景点/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>景点玩乐</span>
        </a>
    </li>
    <li>
        <a href="#" title="景点玩乐">
            <span class="local-nav-icon-icon3"></span>
            <span>景点玩乐</span>
        </a>
    </li>
    <li>
        <a href="#" title="景点玩乐">
            <span class="local-nav-iconicon4"></span>
            <span>景点玩乐</span>
        </a>
    </li>
    <li>
        <a href="#" title="景点玩乐">
            <span class="local-nav-icon-icon5"></span>
            <span>景点·玩乐</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-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</span>
            </a>
        </li>
        <li>
            <a href="#">
                <span class="subnav-entry-icon"></span>
                <span>电话费</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>

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;
    left: 50%;
    /* 固定的盒子应该有宽度 */
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    width: 100%;
    min-width: 320px;
    max-width: 540px;
    height: 44px;
    /* background-color: pink; */
    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;
    box-shadow:0 2px 4px rgba(0,0,0, .2);
}
.search::before{
    content: "";
    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;
    /* background-color: purple; */
    font-size: 12px;
    text-align: center;
    color: #2eaae0;
}
.user::before{
    content: "";
    display: block;
    width: 23px;
    height: 23px;
    background: url(../images/sprite.png) no-repeat -59px -194px;
    background-size: 104px auto;
    margin: 4px auto -2px;
}

/* focus */
.focus{
    padding-top: 44px;
}
.focus img{
    width: 100%;
}

/* 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;
    background-color: pink;
    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{
    overflow: hidden;
    border-radius: 8px;
    margin: 0 4px 3px;
}
.nav-common{
    display: flex;
    height: 88px;
    background-color: pink;
}
.nav-common:nth-child(2){
    margin: 3px 0;
}
.nav-items{
    flex:1;
    display: flex;
    flex-direction: column;
}
.nav-items a{
    flex:1;
    text-align: center;
    line-height: 44px;
    color: #fff;
    font-size: 14px;
    text-shadow: 1px 1px rgb(0,0,0, .2);
}
.nav-items a:nth-child(1){
    border-bottom: 1px solid #fff;
}
.nav-items:nth-child(1) a{
    border: 0;
    background: url(../images/hotel.png) no-repeat bottom center;
    background-size: 121px auto;
}
/* -n+2就是前两个 */
.nav-items:nth-child(-n+2){
    border-right: 1px solid #fff;
}

/* 线性渐变 */
.nav-common:nth-child(1){
    background: -webkit-linear-gradient(left,#FA5A55,#FA994D);
}
.nav-common:nth-child(2){
    background: -webkit-linear-gradient(left,#4B90ED,#53BCED);
}
.nav-common:nth-child(3){
    background: -webkit-linear-gradient(left,#34C2A9,#6CD559);
}

/* 侧 */

.subnav-entry{
    display: flex;
    border-radius: 8px;
    background-color: #fff;
    margin: 0 4px;
    flex-wrap: wrap;
    padding: 5px 0;
}
.subnav-entry li{
    flex: 20%;
}

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

.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: -999px;
    overflow: hidden;
}
.sales-hd h2::after {
    position: absolute;
    content: "";
    top:8px;
    left:20px;
    width: 79px;
    height: 15px;
    background:url(../images/hot.png) no-repeat 0 -20px;
    background-size: 79px auto;
}

.more{
    position: absolute;
    right: 5px;
    top:0px;
    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%;
}