媒体查询、定位、Flex布局
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2022-06-01 20:22:27
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一、媒体查询(大屏优先)
<style>
@media only screen and (min-width:1200px){
html{
font-size: 16px;
}
}
@media only screen and (min-width:970px) and (max-width:1190px){
html {
font-size: 14px;
}
}
@media only screen and (min-width:750px) and (max-width:969px){
html{
font-size: 12px;
}
}
@media only screen and (max-width:749px){
html{
font-size: 10px;
}
}
</style>
二、定位
父元素设置position:relative
,子元素设置position:absolute
<!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>Document</title>
<style>
body{
position: relative;
}
.model{
position: fixed;
top: 20em;
left: 10em;
right: 10em;
padding: 1.5em 0;
background-color: rgb(198, 250, 174);
text-align: center;
}
.model-bg {
position: fixed;
left: 0;
top: 0;
right: 0;
bottom: 0;
background-color: rgba(0,0,0,0.6);
}
</style>
</head>
<body>
<div class="model-bg"></div>
<div class="model">
<form action="">
<div class="login">
<h2>用户登录</h2>
<p><input type="text" name="username" placeholder="请输入用户名"></p>
<p><input type="text" name="pwd" placeholder="请输入密码"></p>
<button>登录</button>
</div>
</form>
</div>
</body>
</html>
三、Flex布局 常用属性
要实现Flex布局,需有容器和项目,容器包含项目
容器设置:display:flex
容器常用属性有3个:
-
flex-flow:row/column wrap/nowrap
第一个参数row/column指定行 / 列排列,默认为row
第二个参数wrap/nowrap 指定当项目过多时是否自动换行,默认nowrap不换行 -
剩余空间分配及排列
place-content:start/end/center/space-between/space-around/space-evenly
默认为start
- space-between两端对齐
- space-around分散对齐
- space-evenly平均对齐
- 1
flex:1 1 auto
第一个参数:放大因子
第二个参数:缩小因子
第三个参数:计算宽度
优先级:max-width > 计算宽度 > width - 2 order 排序
值越小越靠前
<!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>Flex布局</title>
<style>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
.container {
display: flex;
height: 20em;
flex-flow: row nowrap;
/* place-content: start;
place-content: center;
place-content: end;
place-content: space-between;
place-content: space-around;
place-content: space-evenly; */
background-color: yellow;
/* place-items: start;
place-items: center;
place-items: end; */
}
.item {
background-color: lightgreen;
border: 1px solid #f60;
width: 5em;
height: 10em;
padding: 0.5em;
flex:0 0 auto;
}
.item:first-of-type{
background-color: #f60;
order: 1;
}
</style>
</head>
<body>
<div class="container">
<div class="item">item 1</div>
<div class="item">item 2</div>
<div class="item">item 3</div>
<div class="item">item 4</div>
<div class="item">item 5</div>
<div class="item">item 6</div>
<div class="item">item 7</div>
</div>
</body>
</html>
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