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方案-居中

image

居中是很基础并且很频繁的知识点, 在此仅作记录

DOM 结构:

<div class="parent">
    <div class="child"></div>
</div>

flex​

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

absolute​

div.parent {
    position: relative;
}
div.child {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
/* 或者 */
div.child {
    width: 50px;
    height: 10px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -25px;
    margin-top: -5px;
}
/* 或 */
div.child {
    width: 50px;
    height: 10px;
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

grid​

div.parent {
    display: grid;
}
div.child {
    justify-self: center;
    align-self: center;
}

inline​

div.parent {
    font-size: 0;
    text-align: center;
    &::before {
        content: '';
        display: inline-block;
        width: 0;
        height: 100%;
        vertical-align: middle;
    }
}
div.child {
    display: inline-block;
    vertical-align: middle;
}

flex/grid+margin​

div.parent {
    display: flex;
}
div.child {
    margin: auto;
}
/* 同理 */
div.parent {
    display: grid;
}
div.child {
    margin: auto;
}

table-cell​

div.parent {
    display: table;
}
div.child {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
}