SASS 淡入效果问题值得关注

如何解决SASS 淡入效果问题值得关注

我正在尝试使用渐变颜色获得不同的 div，从深到浅。

我可以看到我的代码编辑如何使颜色变亮，但我看不到更暗的效果。我查看了代码，一切正常。淡出效果有效，但淡入效果无效 - 它是相同的。当我查看生成的 css 文件时，我发现背景颜色与 $color-base 值相同。为什么淡入效果不受欢迎？

SCSS：

    @if $k==1 {
        $color-base: red;
    }
    @else if $k==2 {
        $color-base: blue;
    }
    @else {
        $color-base: green;
    }
    .container-#{$k} {
        .base-color {
            background-color: $color-base;
        }
        @for $i from 4 through 1 {
            .darken-#{$i} {
                background-color: fade_in($color-base,0.2 * $i);
                .color-Box-text {
                    color: red;
                }
            }
            .lighten-#{$i} {
                background-color: fade_out($color-base,0.2 * $i);
                .color-Box-text {
                    color: black;
                }
            }
        }
    }
}

HTML：

    <div class="Box darken-4"><span class="color-Box-text">Darken 4</span></div>
    <div class="Box darken-3"><span class="color-Box-text">Darken 3</span></div>
    <div class="Box darken-2"><span class="color-Box-text">Darken 2</span></div>
    <div class="Box darken-1"><span class="color-Box-text">Darken 1</span></div>
    <div class="Box base-color"><span class="color-Box-text">Base color</span></div>
    <div class="Box lighten-1"><span class="color-Box-text">Lighten 1</span></div>
    <div class="Box lighten-2"><span class="color-Box-text">Lighten 2</span></div>
    <div class="Box lighten-3"><span class="color-Box-text">Lighten 3</span></div>
    <div class="Box lighten-4"><span class="color-Box-text">Lighten 4</span></div>
</div>
<div class="mycontainer container-2">
    <div class="Box darken-4"><span class="color-Box-text">Darken 4</span></div>
    <div class="Box darken-3"><span class="color-Box-text">Darken 3</span></div>
    <div class="Box darken-2"><span class="color-Box-text">Darken 2</span></div>
    <div class="Box darken-1"><span class="color-Box-text">Darken 1</span></div>
    <div class="Box base-color"><span class="color-Box-text">Base color</span></div>
    <div class="Box lighten-1"><span class="color-Box-text">Lighten 1</span></div>
    <div class="Box lighten-2"><span class="color-Box-text">Lighten 2</span></div>
    <div class="Box lighten-3"><span class="color-Box-text">Lighten 3</span></div>
    <div class="Box lighten-4"><span class="color-Box-text">Lighten 4</span></div>
</div>
<div class="mycontainer container-3">
    <div class="Box darken-4"><span class="color-Box-text">Darken 4</span></div>
    <div class="Box darken-3"><span class="color-Box-text">Darken 3</span></div>
    <div class="Box darken-2"><span class="color-Box-text">Darken 2</span></div>
    <div class="Box darken-1"><span class="color-Box-text">Darken 1</span></div>
    <div class="Box base-color"><span class="color-Box-text">Base color</span></div>
    <div class="Box lighten-1"><span class="color-Box-text">Lighten 1</span></div>
    <div class="Box lighten-2"><span class="color-Box-text">Lighten 2</span></div>
    <div class="Box lighten-3"><span class="color-Box-text">Lighten 3</span></div>
    <div class="Box lighten-4"><span class="color-Box-text">Lighten 4</span></div>
</div>

解决方法

函数 fade-in() 的作用与 opacify() 相同，并且根据 documentation：

opacify() 函数将 Alpha 通道增加固定量。

您的 $color-base 值都是不透明的，因此 fade-in() 函数不适用，因为它们的 Alpha 通道已经具有最大值。如果您尝试使用 alpha 值低于 1 的基色，您会发现您的代码运行良好。