如何使用sass mixin来追加一组类

Question

我需要帮助创建一个sass混音。

我有一个名为vertical3的类，它将相同的图像叠加在一起3次。我还得到一个属性调用重叠，它的范围从-2到+1，我已经在下面定义了类。这些重叠类位于与垂直3相同的水平上。

如您所见，他们只调整前两项的页边距。我想为这个定义一个sass混合器。

<div class="vertical3 overlap-3">
    <img>
    <img>
    <img>
</div>


.vertical3 {
    flex-flow: column;
    flex-direction: column-reverse;
    justify-content: flex-start;
    align-items: center;
    img {
        max-height: 27%;
    }
}

.vertical3.overlap-2 {
    img:first-child {
        margin-top: -5%;
    }

    img:nth-child(2) {
        margin-top: -5%;
    }
}
.vertical3.overlap-1 {
    img:first-child {
        margin-top: -2.5%;
    }

    img:nth-child(2) {
        margin-top: -2.5%;
    }
}
.vertical3.overlap2 {
    img:first-child {
        margin-top: 5%;
    }

    img:nth-child(2) {
        margin-top: 5%;
    }
}
.vertical3.overlap1 {
    img:first-child {
        margin-top: 2.5%;
    }

    img:nth-child(2) {
        margin-top: 2.5%;
    }
}

我想要完成这样的事情

.vertical3 {
    flex-flow: column;
    flex-direction: column-reverse;
    justify-content: flex-start;
    align-items: center;
    img {
        max-height: 27%;
    }
    @inlcude overlap(2.5%)
}

@mixin overlap($base){
    adding overlap-2 to overlap2 as classes
}

Answer 1

我创建了下面的代码来演示如何实现这一目标。

您将调用mixin并传入您想要使用的较大的保证金值，然后将该值除以2表示较小的边距，并输出所需的所有相关类。

​

@mixin overlap($base){
  &.overlap-2 {
    img {
      &:first-child, &:nth-child(2) {
        margin-top: -(($base) / 2);
      }
    }
  }
  &.overlap-1 {
   img {
      &:first-child, &:nth-child(2) {
        margin-top: -($base);
      }
    } 
  }
}

.vertical3 {
    flex-flow: column;
    flex-direction: column-reverse;
    justify-content: flex-start;
    align-items: center;
    background: red;
    width: 50px;
    height: 50px;
    img {
        max-height: 27%;
    }
    @include overlap(5%);
}

​