文章目录
水平居中
- 方法一:在父容器上定义固定宽度,margin值设成auto
helloworld
你好啊!!!!!!!!!

方法2:在子元素中将display设置为inline-block,父元素text-algin设置为center
helloworld
你好啊!!!!!!!!!

垂直居中
helloworld
你好啊!!!!!!!!!
helloworld
你好啊!!!!!!!!!
垂直水平居中
方式1:绝对定位
居中

方式二 定位+负margin
居中

方式3:使用translate实现平移
下面的transform代码可以更换为transform: translate(-50%,-50%);
居中
效果如上图。
方式4:通过设置bottom top left right margin来实现
居中

方式5:flex布局
最长使用,设置 display: flex;justify-content: center;align-items: center;三个属性;
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>居中</title> <style> .father {
display: flex; justify-content: center; align-items: center; width: 500px; height: 500px; background-color: rgb(197, 34, 34); } .child {
width: 50px; height: 70px; background-color: rgb(36, 167, 64); } </style> </head> <body> <div class="father"> <div class="child"></div> </div> </body> </html>
方式6:使用tablecell
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>居中</title> <style> .father {
display: table-cell; vertical-align: middle; text-align: center; width: 500px; height: 500px; background-color: rgb(197, 34, 34); } .child {
display: inline-block; width: 50px; height: 70px; background-color: rgb(36, 167, 64); } </style> </head> <body> <div class="father"> <div class="child"></div> </div> </body> </html>
方式7:JS方式
<!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> </head> <style> .father {
width: 500px; height: 500px; background-color: rgb(197, 34, 34); } .child {
width: 50px; height: 70px; background-color: rgb(28, 150, 123); } </style> <body> <div class="father"> <div class="child"> </div> </div> </body> <script> let father=document.getElementsByClassName('father')[0]; let child=document.getElementsByClassName('child')[0]; fatherH=father.clientHeight; fatherW=father.clientWidth; childW=child.offsetWidth; childH=child.offsetHeight; child.style.position="absolute"; child.style.top=(fatherH-childH)/2+'px'; child.style.left=(fatherW-childW)/2+'px'; </script> </html>
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