演示flex container 容器中的4个属性 -

1.实列flex项目上的三个属性

flex-grow 项目允许放大
flex-shrink 收缩

flex-basis 设置项目在主轴上的大小，它优先于项目本身的设置

  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: auto;

或者

  flex: 1 0 auto;

还可以默认

  flex: initial;

代码区

效果:

flex-shrink 收缩
flex-basis 设置项目在主轴上的大小，它优先于项目本身的设置

order
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" />
<title>项目上的flex属性</title>
<style>

* {
  box-sizing: border-box;
}
:root {
  font-size: 10px;
}
body {
  font-size: 1.6rem;
}
.container {
  display: flex;
  height: 20rem;
  border: 1px solid #000;
}
.container > .item {
  width: 10rem;
  background-color: lightcyan;
  border: 1px solid #000;
  order: 0;
}
.item.one {
  background-color: #fff;
  order: 90;
}
.item.two {
  background-color: #ff7;
}
item.three {
  background-color: #9f7;
}
.item.four {
  background-color: #897;
}

</style>
</head>
<body>
<div class="container">

<div class="item one">item1</div>
<div class="item two">item2</div>
<div class="item three three">item3</div>
<div class="item four">item4</div>

</div>
</body>
</html>

2.移动商城首页的页眉和页脚的布局

先写index.html, 写上3个div class: header,main and footer, 链接index.css, reset.css
在css里面布局，保险一点最好在header and footer后面加上z-index.
代码html
<link rel="stylesheet" href="static/css/index.css" <div class="header">header</div>
<div class="main">main</div>
<div class="footer">footer</div>
代码index.css
@import “reset.css”
.header {
background: red
color: white
height: 4.4rem
position: fixed;
left: 0;
top: 0;
right: 0;
z-index.100
}
.main {
position: absolute;
top: 4.4rem,
left: 0;
right: 0;
bottom: 4.4rem;
}
.footer {
background: grey;
color: white;
height: 4.4rem;
position: fixed;
left, bottom and right all are 0;
z-size.100
}
代码reset.css

{
margin: 0;
padding:0;
box-sizing: border-box;
}
li {
list-style: none;
}
a {
text-decoration: none;
color: grey;
}
body {
background-color: #f6f6f6;
}
html {
font-size: 10px;
}
body {
font-size: 1.6rem;
}
@media screen and (min-width: 480px) {
html {
font-size: 12px;
}
}

@media screen and (min-width: 640pz) {
html {
font-size: 14px;
}
}

@media screen and (min-width: 720pz) {
html {
font-size: 16px;
}
}

演示flex container 容器中的4个属性

1.实列flex项目上的三个属性

2.移动商城首页的页眉和页脚的布局

代码html

代码index.css

代码reset.css

效果