笔记整理之一：水平垂直居中
PC固定宽高、一般使用maring负值进行居中
PC不固定宽高、一般使用relative和left进行
下面三种方案平常都很少被使用的到
verticle-align: middle;
display: table-cell;
top:0; right:0; bottom:0; left:0;移动端一般使用（PC方案在移动端都可以使用）
transform: translate(-50%,-50%);
display: flex; justify-content: center; align-items: center;文本水平垂直居中
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文本垂直</title>
<style>
.xx_wrap {
width: 500px;
height: 500px;
background-color: greenyellow;
}
.xx_wrap p {
line-height: 500px;
text-align: center;
}
</style>
</head>
<body>
<div class="xx_wrap">
<p>文本垂直居中</p>
</div>
</body>
</html>移动端水平垂直居中
1、 CSS3垂直居中方案
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>快级元素水平垂直居中(不固定宽高)</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
ol, ul {
list-style: none;
}
.box {
position: relative;
width: 500px;
height: 500px;
background-color: blueviolet;
}
.myUl {
position: absolute;
left: 50%;
top: 50%;
-webkit-transform: translate(-50%, -50%);
-moz-transform: translate(-50%, -50%);
-ms-transform: translate(-50%, -50%);
-o-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="box">
<ul class="myUl">
transform: translate(-50%,-50%);居中方案
</ul>
</div>
</body>
</html>2、flex居中方案
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>flex水平垂直居中</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
ol, ul {
list-style: none;
}
.box {
width: 500px;
height: 500px;
background-color: #77BBDD;
/** 各种版本兼容**/
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
/** 垂直居中核心、兼容**/
-webkit-box-pack: center;//09版水平居中
-moz-box-pack: center;
-ms-flex-pack: center;//过度版(混合版)
-webkit-justify-content: center;//12版水平居中
justify-content: center;
-webkit-box-align: center;//09版垂直居中
-moz-box-align: center;
-ms-flex-align: center;//过度版(混合版)
-webkit-align-items: center;//12版垂直居中
align-items: center;
width: 0%;//低版本Android的flex-item无法等分
display: block;
/*
实则只需三行
display: flex;
justify-content: center;
align-items: center;
*/
}
.box .div1 {
width: 200px;
height: 200px;
background-color: red;
}
</style>
</head>
<body>
<div class="box">
<div class="div1">flex水平垂直居中</div>
</div>
</body>
</html>PC端水平垂直居中
1、快级元素水平垂直居中(固定宽高、最常用)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>水平、垂直居中</title>
<style>
.xx_wrap {
position: relative;
width: 500px;
height: 500px;
background-color: greenyellow;
}
.xx_wrap p {
width: 200px;
height: 200px;
background-color: red;
position: absolute;
left: 50%;top: 50%;
margin-left: -100px;
margin-top: -100px;
}
</style>
</head>
<body>
<div class="xx_wrap">
<p>快级元素水平垂直居中(固定宽高)</p>
</div>
</body>
</html>4、快级元素水平垂直居中(不固定宽高)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>快级元素水平垂直居中(不固定宽高)</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
ol, ul {
list-style: none;
}
/* 定位 + 浮动 */
.myUl {
float: left;
position: relative;
left: 50%;
background-color: blueviolet;
}
.myUl li {
left: -50%;
position: relative;
}
/* 绝对定位方案
.box {position: relative;}
.myUl {position: absolute;left: 50%;background-color: blueviolet;}
.myUl li {left: -50%;position: relative;}
*/
</style>
</head>
<body>
<div class="box">
<ul class="myUl">
<li>快级元素水平垂直居中(不固定宽高)</li>
</ul>
</div>
</body>
</html>2、绝对定位居中（禁IE6、7）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>绝对定位水平垂直居中</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
.wrap {
width: 500px;
height: 500px;
background-color: chartreuse;
position: relative;
}
.wrap .div1 {
width: 50%;
height: 50%;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
background-color: yellow;
}
</style>
</head>
<body>
<div class="wrap">
<div class="div1">绝对定位水平垂直居中</div>
</div>
</body>
</html>3、非快级元素水平垂直居中（vertical-align: middle禁IE6、7、8）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>非快级元素水平垂直居中</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
ol, ul {
list-style: none;
}
.box {
width: 500px;
height: 500px;
background-color: #77BBDD;
text-align: center;
}
.box img {
/* 若为快级元素：则修改为display: inilne-block;即可 */
width: 200px;
height: 200px;
background-color: red;
vertical-align: middle;
}
.box::after {
content: '';
width: 5px;
line-height: 500px;
background-color: yellow;
}
</style>
</head>
<body>
<div class="box">
<img src="http://img0.bdstatic.com/img/image/2016ss1.jpg" alt=""/>
</div>
</body>
</html>5、table-cell水平垂直居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>绝对定位水平垂直居中</title>
<style>
* {
margin: 0;
padding: 0;
font-size: 12px;
font-family: Arial, Helvetica, sans-serif;
}
.wrap {
width: 500px;
height: 500px;
background-color: chartreuse;
display: table;
}
.wrap .div1 {
display: table-cell;
vertical-align: middle;
}
.wrap .div1 p {
width: 50%;
height: 50%;
margin: 0 auto;
background-color: burlywood;
}
</style>
</head>
<body>
<div class="wrap">
<div class="div1">
<p>绝对定位水平垂直居中</p>
</div>
</div>
</body>
</html>