<div class="parent">
<div class="child"></div>
</div>
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1)使用position + transform,不定宽高时
.parent{
position: relative;
}
.child{
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
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2)使用position + transform,有宽高时
.parent{
position: relative;
}
.child{
width: 100px;
height: 100px;
position: absolute;
left: 50%;
top: 50%;
margin-left: -50px;
margin-top: -50px;
}
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3)使用flex
.parent{
display: flex;
align-items: center;
justify-content: center;
}
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或者
.parent{
display: flex;
align-items: center;
}
.child{
margin: 0 auto;
}
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或者
.parent{
display: flex;
}
.child{
margin: auto;
}
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4)使用position
.parent{
position: relative;
}
.child{
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
margin: auto;
}
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5)使用grid
.parent{
display: grid;
}
.child{
justify-self: center;
align-self: center;
}
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6)使用table
.parent{
display: table;
}
.child{
display: table-cell;
vertical-align: middle;
text-align: center;
}
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或者
.parent {
display: table-cell;
text-align: center;
vertical-align: middle;
}
.child {
display: inline-block;
}
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7)使用伪类
.parent{
font-size: 0;
text-align: center;
}
.parent::before {
content: "";
display: inline-block;
width: 0;
height: 100%;
vertical-align: middle;
}
.child{
display: inline-block;
vertical-align: middle;
}