1、absolute加margin方案
div{
position: absolute;
width: 100px;
height: 100px;
left: 50%;
top: 50%:
margin-top: -50px;
margin-left: -50px;
}
2、fixed 加 margin 方案
div{
position: fixed;
width: 100px;
height: 100px;
top: 0;
right:0;
left: 0;
bottom: 0;
margin: auto;
}
3、display:table 方案
div{
display: table-cell;
vertical-align: middle;
text-align: center;
width: 100px;
height: 100px;
}
4、行内元素line-height方案
div{
text-align: center;
line-height: 100px;
}
5、flex 弹性布局方案
div{
display: flex;
align-items: center;
justify-content:center
}
6、transform 未知元素宽高解决方案
div{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%)
}
来源:https://www.cnblogs.com/MrJaven/p/11195885.html