× 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> Copy after login
<div class="test" style="background-color: lightblue;width: 200px;">测试文字</div> Copy after login
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> Copy after login
<div class="parent" style="background-color: gray; width:200px; height:100px;"> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
【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> Copy after login
<div class="parent" style="background-color: gray; width:200px; "> <img class="child" src="http://sandbox.runjs.cn/uploads/rs/26/ddzmgynp/img1.gif" style="max-width:90%" alt="test"></div> Copy after login
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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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【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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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【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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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【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> Copy after login
<div class="parent" style="background-color: lightgray; width:200px; height:100px; "> <div class="child" style="background-color: lightblue;">测试文字</div></div> Copy after login
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