<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.box{
200px;
height: 200px;
border: 1px solid #000000;
}
.cont{
padding: 50px;
background: red;
}
/*方法1
* 最简单的flex布局,外层容器加上如下样式即可
* display: flex;
justify-content: center;
align-items: center;
*
* 兼容性：
IE:ie9以上加-ms-前缀
移动端：安卓4.2-4.3加-webkit-前缀
UC浏览器加-webkit-前缀*/
.box1{
display: -webkit-flex;
display: -moz-flex;
display: -o-flex;
display: -ms-flex;
display: flex;
justify-content: center;
align-items: center;
}
/*方法2
利用table-cell
兼容性ie7以上支持
* */
.box2{
display: table-cell;
text-align: center;
vertical-align: middle;
}
.cont2{
vertical-align: middle;
display: inline-block;
*display:inline;
*zoom:1;
}
/*方法3
使用CSS3 transform
兼容性
IE:ie8以上，ie9加-ms-前缀
安卓4.3-4.4.4版本浏览器加-webkit-前缀
UC加-webkit-前缀
* */
.box3{
position: relative;
}
.cont3{
position: absolute;
left: 50%;
top: 50%;
transform:translate(-50%,-50%);
-ms-transform:translate(-50%,-50%); /* IE 9 */
-moz-transform:translate(-50%,-50%); /* Firefox */
-webkit-transform:translate(-50%,-50%); /* Safari 和 Chrome */
-o-transform:translate(-50%,-50%); /* Opera */
}
/*方法4js实现 兼容所有浏览器*/
.box4{
position: relative;
}
.cont4{
position: absolute;
left: 50%;
top: 50%;
border: 5px solid #000000;
}
</style>
</head>
<body>
<!--方法1-->
<div class="box1 box">
<div class="cont1 cont">1</div>
</div>
<!--方法2-->
<div class="box2 box">
<div class="cont2 cont">2</div>
</div>
<!--方法3-->
<div class="box3 box">
<div class="cont3 cont">3</div>
</div>
<!--方法4-->
<div class="box4 box" id="box4">
<div class="cont4 cont" id="cont4">4</div>
</div>
<script type="text/javascript">
var cont4=document.getElementById("cont4");
// console.log(cont4.offsetHeight,cont4.clientHeight);
linCenter(cont4);
function linCenter(obj){
obj.style.marginLeft="-"+obj.offsetWidth/2+"px";
obj.style.marginTop="-"+obj.offsetHeight/2+"px";
}
</script>
</body>
</html>