/**
* @mixin 混合器
* @mixin posA($top, $right, $bottom, $left) {
*    position: absolute;
*    left:$left;
*    top: $top
* }
* 详细用法： [sass官网](https://www.sass.hk/)
*/

@mixin disFlex($wrap: nowrap, $direction: row, $justify: center, $align: center) {
    display: flex;
    flex-wrap: $wrap;
    flex-direction: $direction;
    justify-content: $justify;
    align-items: $align
}
@mixin isFixed() {
    position: fixed;
    width: 100%;
}
@mixin isFixedTop($top: 0) {
    position: fixed;
    width: 100%;
    top: $top;
}
@mixin isFixedBottom($bottom: 0) {
    position: fixed;
    width: 100%;
    bottom: $bottom;
}
@mixin pad($top: 0, $right: 0, $bottom: 0, $left: 0) {
    box-sizing: border-box;
    padding: $top $right $bottom $left
}