Sass-map-get和simple变量有什么区别？

乐2020-04-03

我是Sass的新手，并且我一直在阅读有关使用变量的不同方法的信息，我尝试应用的这一原理仅适用于颜色，我发现的某些解决方案就是这样的（map-get）：

$colors: (
    lighestGray: #F8F8FA,
    lightGray: #A5ACBA,
    light: #FFFFFF,
    dark: #000000,
    link: #428bca,
    linkHover: #555,
    navBlue: #7AC243,
    navGreen: #009CDC,
);

然后像这样在类上使用它：

.my-class {
    color: map-get($colors, dark);
}

另一种方法是使用：

$color-black: #000000;

然后像这样使用它：

.my-class {
    color: $color-black;
}

我的问题是，哪个选项更好？或map-get功能还有另一个目的？，Sass是否为此设置了模式，或者取决于每个Web开发人员？

谢谢你的协助！。

问候。

小小蛋蛋2020/04/03 10:46:23

map-get用于从更多类型的对象获取css值。

假设您有$ param，在其中定义了多个属性，现在要分配。您可以通过以下方式使用它-

color: map-get($params, "color");

其他简单变量仅包含单个值的地方

map-get从持有多个值的对象获取css值，而获取单个值的变量

JinJin2020/04/03 10:46:23

使用具有后备颜色的CSS变量制作主题的示例，请参见Codepen CSS变量

// VARS (FOR FALLBACK)
// -------------------
$theme-base: #70c1ac;
$theme-base-aa: adjust-color($theme-base, $blue: 125);

// PROCESSED THEME
$theme-color: $theme-base;
$theme-color-dark: darken($theme-color, 20%);
$theme-color-light: lighten($theme-color, 20%);
$theme-color-mixed: mix(#fff, $theme-color, 75%);
$theme-color-trans: transparentize($theme-color, .4);

// PROCESSED SECONDARY
$theme-color-aa: $theme-base-aa;
$theme-color-aa-dark: darken($theme-color-aa, 20%);
$theme-color-aa-light: lighten($theme-color-aa, 20%);
$theme-color-aa-mixed: mix(#fff, $theme-color-aa, 75%);
$theme-color-aa-trans: transparentize($theme-color-aa, .4);

$theme-colors: (
  "aa-dark": $theme-color-aa-dark,
  "aa-light": $theme-color-aa-light,
  "aa-mixed": $theme-color-aa-mixed,
  "aa-trans": $theme-color-aa-trans,
  aa: $theme-color-aa,
  dark: $theme-color-dark,
  light: $theme-color-light,
  mixed: $theme-color-mixed,
  theme: $theme-color,
  trans: $theme-color-trans,
);

@mixin themeColor ($prop, $color: null) {
  @if ($color) {
    #{$prop}: map-get($theme-colors, $color);
    #{$prop}: var(--theme-color-#{$color})
  } @else {
    #{$prop}: map-get($theme-colors, theme);
    #{$prop}: var(--theme-color);
  }
}

@mixin setThemeColors($base1: "", $base2: "") {
  // BASE THEME COLORS
  $color-base: $theme-base;
  $color-aa: $theme-base-aa;

  @if ($base1) {
    $color-base: $base1;
    $color-aa: $base2;
  }

  // PROCESSED THEME COLORS
  $color-aa-dark: darken($color-aa, 20%);
  $color-aa-light: lighten($color-aa, 20%);
  $color-aa-mixed: mix(#fff, $color-aa, 75%);
  $color-aa-trans: transparentize($color-aa, .5);
  $color-aa: $color-aa;
  $color-dark: darken($color-base, 20%);
  $color-light: lighten($color-base, 20%);
  $color-mixed: mix(#fff, $color-base, 75%);
  $color-trans: transparentize($color-base, .5);

  // CSS VARIABLES
  --theme-color-aa-dark: #{$color-aa-dark};
  --theme-color-aa-light: #{$color-aa-light};
  --theme-color-aa-trans: #{$color-aa-trans};
  --theme-color-aa: #{$color-aa};
  --theme-color-dark: #{$color-dark};
  --theme-color-light: #{$color-light};
  --theme-color-mixed: #{$color-mixed};
  --theme-color-trans: #{$color-trans};
  --theme-color: #{$color-base};
}

:root {
  @include setThemeColors($theme-base, $theme-base-aa);
}

body {
  @include themeColor("background","mixed");
  font-size: 2rem;
}

ul {
  list-style: none; /* Remove default bullets */
}

ul li::before {
  content: "\2022";  /* Add content: \2022 is the CSS Code/unicode for a bullet */
  @include themeColor("color","dark");

  font-weight: bold; /* If you want it to be bold */
  display: inline-block; /* Needed to add space between the bullet and the text */ 
  width: 1.2em; /* Also needed for space (tweak if needed) */
  margin-left: -.8em; /* Also needed for space (tweak if needed) */
}

li {
  @include themeColor("color", "light");
  @include themeColor("background", "aa-dark");
}

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