基于scss的主题变换

// 五种主题切换
$themes: (
  red: (
    font-color: red,
  ),
  green: (
    font-color: green
  ),
  blue: (
    font-color: blue
  ),
  orange: (font-color: orange),
  yellow: (font-color: yellow),
);

$color-red: red;
$color-green: green;
$color-blue: blue;
$color-orange: orange;
$color-yellow: yellow;

@import "./themeVariable.scss";
@mixin themify($themes: $themes) {
  @each $theme-name, $map in $themes {
    // & 表示父级元素
    // !global 表示覆盖原来的
    .theme-#{$theme-name} & {
      $theme-map: () !global;
      // 循环合并键值对
      @each $key, $value in $map {
        $theme-map: map-merge($theme-map, ($key: $value)) !global;
      }
      // 表示包含 下面函数 themed()
      @content;

      $theme-map: null !global;
    }
  }
}

@function themed($key) {
  @return map-get($theme-map, $key);
}

<template>
  <div class="app-root" :class="themeClass">
    <div class="app-container">
      <p>{{ msg }}</p> 
      <select v-model="theme">
        <option value="red">Red</option>
        <option value="green">Green</option>
        <option value="blue">Blue</option>
      </select>
    </div>
  </div>
</template>
<script>
export default {
  name: 'app',
  data() {
    return {
      msg: 'Dynamic Themes',
      theme: 'red'
    }
  },
  computed: {
    themeClass() {
      return `theme-${this.theme}`;
    }
  }
}

</script>
<style lang="scss" scoped>
@import "../assets/css/themfy.scss";
.app-container {
  @include themify($themes) {
    color: themed('font-color');
  }
}
</style>