vue2 sass主题一键修改功能

1、先创建一个 _theme.scss文件 作为各类主题颜色的整理

$themes: ( 
    light: ( 
        //字体
        font_color1: #414141,
         font_color2: white,
         $color-yellow: rgb(238, 255, 0),
          //背景
        background_color1: $color-red,
         background_color2: #f0f2f5, 
          background_color3: red,
           background_color4: #2674e7, 
            //边框
        border_color1: #3d414a),
     dark: (
          //字体
        font_color1: #a7a7a7,
        font_color2: white, 
          //背景
        background_color1: $color-light-gray,
        $color-yellow: rgb(0, 255, 0), 
        background_color2: #283142, 
        background_color3: #1e6ceb,
        background_color4: #323e4e, 
          //边框
        border_color1: #3d414a));
          //变量          
        $color-red: rgb(0, 0, 0);
        // $color-yellow: rgb(83, 149, 235);
        $color-white: white;
        $color-light-gray: #818380;))

2、然后再创建一个 _handle.scss 文件 作为sass混合函数的存放 主要是哪个页面需要则引用即可

@import "./_themes.scss";
//遍历主题map
@mixin themeify {
    @each $theme-name,
    $theme-map in $themes {
        // ！global 把局部变量强升为全局变量
        $theme-map: $theme-map !global;
        //判断html的data-theme的属性值  #{}是sass的插值表达式
        //& sass嵌套里的父容器标识   @content是混合器插槽，像vue的slot
        [data-theme="#{$theme-name}"] & {
            @content;
        }
    }
}

//声明一个根据Key获取颜色的function
@function themed($key) {
    @return map-get($theme-map, $key);
}

//获取背景颜色
@mixin background_color($color) {
    @include themeify {
        background-color: themed($color)!important;
    }
}

//获取字体颜色
@mixin font_color($color) {
    @include themeify {
        color: themed($color)!important;
    }
}

//获取边框颜色
@mixin border_color($color) {
    @include themeify {
        border-color: themed($color)!important;
    }
}

3、在页面中使用 , app.vue

html  
 <div class="btn">
        <el-button type="warning" @click="theme('light')">浅色</el-button>
        <el-button type="danger" @click="theme('dark')">深色</el-button>
   </div>

js
 //换主题
    theme(type) {
      // this.$store.commit("upDate", { themeType: type });
      window.document.documentElement.setAttribute("data-theme", type);
    },

css

@import "@/assets/_handle.scss";

 //修改任何元素都可以作为等级最高级 原理就是根据html标签的 [name]来判断主题类型进行修改
body {
    @include background_color(background_color4);
    .box {
        @include font_color("$color-yellow");
        @include background_color($color-yellow);
        @include border_color("border_color1");
    }
    .el-button {
        // @include background_color($color-yellow);
        &:hover {
            @include background_color($color-yellow);
        }
    }
}