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%;
}