sass complie错误，提示$ color：即使我声明了color，null也不是颜色 [英] sass complie error saying $color: null is not a color even though i declared color

问题描述

我是sass的新手，我写了一些sass代码，但未编译。

I am new to sass and I wrote some sass code but it is not compiling.

 $classes : primary secondary success warning danger;
    $colors : (primary:#007bff,secondary : #6c757d,success: #28a745,warning: #ffc107,dangaer: #dc3545);
    @each $class in $classes{
      .btn-#{$class}{
        $currentColor: map-get($colors,#{$class});
        background:linear-gradient(to right,$currentColor,lighten($currentColor,10%));
      }
    }

错误为：

$color: null is not a color.
stdin 14:55  root stylesheet on line 14 at column 55

但是当我替换线性带有变量的渐变效果很好，即

But when I replace linear-gradient with variable it is working fine i.e

$classes : primary secondary success warning danger;
$colors : (primary:#007bff,secondary : #6c757d,success: #28a745,warning: #ffc107,dangaer: #dc3545);

    @each $class in $classes{
      .btn-#{$class}{
        $currentColor: map-get($colors,#{$class});
        background:$currentColor;
        //background:linear-gradient(to right,$currentColor,lighten($currentColor,10%));
      }
    }

此代码已成功编译。

linear-gradient（）函数中$ currentColor变量的作用或作用是什么

What is the for nor working of $currentColor variable inside linear-gradient() function

推荐答案

实际上，有些东西可以将变量从map-get传递到其他sass函数。

Indeed there is something with passing variables from map-get to other sass functions.

但是您可以稍微修改一下代码，它将起作用：

But you can slightly modify your code and it will work:

$classes: primary secondary success warning danger;
$colors: (
    primary: ( normal: #007bff, light: lighten(#007bff,10%) ),
    secondary: ( normal: #6c757d, light: lighten(#6c757d,10%) ),
    success: ( normal: #28a745, light: lighten(#28a745,10%) ),
    warning: ( normal: #ffc107, light: lighten(#ffc107,10%) ),
    danger: ( normal: #dc3545, light: lighten(#dc3545,10%) )
);
@each $class in $classes{
  .btn-#{$class}{
    $currentColor: map-get(map-get($colors,#{$class}), normal);
    $currentColorLighten: map-get(map-get($colors,#{$class}), light);

    background: linear-gradient(to right, $currentColor, $currentColorLighten);
  }
}

为每个类定义两种颜色（正常和淡化）版本），只需通过两次地图获取即可使用它。

You define two colors for each class (normal and lighten version) and just use it via double map-get.

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