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关于css3:CSS垂直水平居中的方式总结

程度垂直居中分居中元素 定宽高 不定宽高 两种状况。

不仅限本文的实现形式,本文只总结绝对罕用的形式。

如果有公共代码:

.wp {
    border: 1px solid red;
    width: 300px;
    height: 300px;
}
.box {background: green;}
//size 仅定宽须要 
.box.size{
    width: 100px;
    height: 100px;
}

<div class="wp">
    <div class="box size">123123</div>
</div>

一、定宽高

absolute + 负 margin
absolute + margin auto
absolute + calc

1.absolute + 负 margin

.wp {
    border: 1px solid red;
    width: 300px;
    height: 300px;
}
.box {background: green;}
.box.size{
    width: 100px;
    height: 100px;
}

2.absolute + margin auto

.wp {position: relative;}
.box {
    position: absolute;;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

3.absolute + calc

.wp {position: relative;}
.box {
    position: absolute;;
    top: calc(50% - 50px);
    left: calc(50% - 50px);
}

二、不定宽高

absolute + transform
lineheight
css-table
flex
grid

1.absolute + transform

.wp {position: relative;}
.box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

2.lineheight

.wp {
    line-height: 300px;
    text-align: center;
    font-size: 0px;
}
.box {
    font-size: 16px;
    display: inline-block;
    vertical-align: middle;
    line-height: initial;
    text-align: left; /* 修改文字 */
}

3.css-table

.wp {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}
.box {display: inline-block;}

4.flex

.wp {
    display: flex;
    justify-content: center;
    align-items: center;
}

5.grid

.wp {display: grid;}
.box {
    align-self: center;
    justify-self: center;
}

总结:

PC 端有兼容性要求,宽高固定,举荐 absolute + 负 margin
PC 端有兼容要求,宽高不固定,举荐 css-table
PC 端无兼容性要求,举荐 flex
挪动端举荐应用 flex

参考:https://segmentfault.com/a/11…

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