CSS实现水平垂直同时居中的5种思路_html/css_WEB-ITnose

× 目录 [1]水平对齐+行高 [2]水平+垂直对齐 [3]margin+垂直对齐 [4]absolute [5]flex

前面的话

　　水平居中和垂直居中已经单独介绍过，本文将介绍水平垂直同时居中的5种思路

 

思路一: text-align + line-height实现单行文本水平垂直居中

<style>.test{    text-align: center;    line-height: 100px;}</style>

<div class="test" style="background-color: lightblue;width: 200px;">测试文字</div>   

思路二: text-align + vertical-align

【1】在父元素设置text-align和vertical-align，并将父元素设置为table-cell元素，子元素设置为inline-block元素

　　[注意]若兼容IE7-浏览器，将结构改为

结构来实现table-cell的效果；用display:inline;zoom:1;来实现inline-block的效果

<style>.parent{    display: table-cell;    text-align: center;    vertical-align: middle;}.child{    display: inline-block;}</style>

<div class="parent" style="background-color: gray; width:200px; height:100px;">  <div class="child" style="background-color: lightblue;">测试文字</div></div> 

【2】若子元素是图像，可不使用table-cell，而是其父元素用行高替代高度，且字体大小设为0。子元素本身设置vertical-align:middle

<style>.parent{    text-align: center;    line-height: 100px;    font-size: 0;}.child{    vertical-align: middle;}</style>

<div class="parent" style="background-color: gray; width:200px; ">  <img class="child lazy"  src="/static/imghw/default1.png"  data-src="http://sandbox.runjs.cn/uploads/rs/26/ddzmgynp/img1.gif"     style="max-width:90%" alt="test"></div>  

思路三: margin + vertical-align

　　要想在父元素中设置vertical-align，须设置为table-cell元素；要想让margin:0 auto实现水平居中的块元素内容撑开宽度，须设置为table元素。而table元素是可以嵌套在tabel-cell元素里面的，就像一个单元格里可以嵌套一个表格

　　[注意]若兼容IE7-浏览器，需将结构改为

结构

<style>.parent{    display:table-cell;    vertical-align: middle;}.child{    display: table;    margin: 0 auto;}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

思路四: 使用absolute

【1】利用绝对定位元素的盒模型特性，在偏移属性为确定值的基础上，设置margin:auto

<style>.parent{    position: relative;}.child{    position: absolute;    top: 0;    left: 0;    right: 0;    bottom: 0;    height: 50px;    width: 80px;    margin: auto;}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

【2】利用绝对定位元素的偏移属性和translate()函数的自身偏移达到水平垂直居中的效果

　　[注意]IE9-浏览器不支持

<style>.parent{    position: relative;}.child{    position: absolute;    top: 50%;    left: 50%;    transform: translate(-50%,-50%);}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

【3】在子元素宽高已知的情况下，可以配合margin负值达到水平垂直居中效果

<style>.parent{    position: relative;}.child{    position: absolute;    top: 50%;    left: 50%;    width: 80px;    height: 60px;    margin-left: -40px;    margin-top: -30px;}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

思路五: 使用flex

　　[注意]IE9-浏览器不支持

【1】在伸缩项目上使用margin:auto

<style>.parent{    display: flex;}.child{    margin: auto;}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

【2】在伸缩容器上使用主轴对齐justify-content和侧轴对齐align-items

<style>.parent{    display: flex;    justify-content: center;    align-items: center;}</style>

<div class="parent" style="background-color: lightgray; width:200px; height:100px; ">  <div class="child" style="background-color: lightblue;">测试文字</div></div>  

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