3分钟13行代码搭建sass版移动端网格系统

@mixin row() {
    width: 100%;
    display: flex;
}
@mixin col($num, $total: 1) {
    // 如果$total为默认的1，则表示等分的$num分之一
    // 否则计算$num/$total
    @if $total == 1 {
        width: 100% / $num;
    } @else {
        width: percentage($num / $total);
    }
}

.row{
    @include row;
}
// col的命名规范为col-占的格子数-总的格子数
.col-1-2{
    @include col(2);
}
.col-1-3{
    @include col(1, 3);
}
.col-2-3{
    @include col(2, 3);
}
.col-1-4{
    @include col(4);
}
.col-3-4{
    @include col(3, 4);
}
.col-2-5{
    @include col(2，5);
}

@charset "UTF-8";

//-----------------------------------------------------
// grid system
//-----------------------------------------------------

$gridFlex:          false !default;
$gridRowClearfix:   false !default; // 如果采用float，子元素清除浮动使用clearfix或overflow
$gridClass:         false !default;

// row
@mixin row() {
    width: 100%;
    @if $gridFlex {
        display: flex;
    } @else if $gridRowClearfix{
        @extend %clearfix;
    } @else {
        overflow: hidden;
    }
}

// col
@mixin col($num, $total: 1) {
    @if not $gridFlex {
        float: left;
    }
    // 如果$total为默认的1，则表示等分的$num分之一
    // 否则计算$num/$total
    @if $total == 1 {
        width: 100% / $num; 
    } @else {
        width: percentage($num / $total);
    }
}

// 是否开启class
@if $gridClass {
    .row{
        @include row;
    }
    .col-1-2{
        @include col(2);
    }
    .col-1-3{
        @include col(1, 3);
    }
    .col-2-3{
        @include col(2, 3);
    }
    .col-1-4{
        @include col(4);
    }
    .col-3-4{
        @include col(3, 4);
    }
    .col-1-5{
        @include col(5);
    }
    .col-2-5{
        @include col(2, 5);
    }
    .col-3-5{
        @include col(3, 5);
    }
    .col-4-5{
        @include col(4, 5);
    }
}