<!-- 中心 -->
<template>
 动态获取父级class名称，进行一个父级class的多次定义
 <div :class="className">
 <div class="switch" v-on:click="chang()">
  {{ className == "box" "开灯" : "关灯" }}
 </div>
 </div>
</template>
<script>
export default {
 name: "Centre",
 data() {
 return {
  className: "box"
 };
 },
 methods: {
 // 改变class
 chang() {
  this.className === "box"
  "boxs") 
  : (this.className = "box");
 }
 },
};
</script>
<style lang="scss">
当class为box 使用witch的css
@import "./style/witch.scss";
当class为boxs 使用black的css
@import "./style/black.scss";
.switch {
 position: fixed;
 top: 4px;
 right: 10px;
 z-index: 50;
 width: 60px;
 height: 60px;
 background: #fff;
 line-height: 60px;
 border-radius: 20%;
}
</style>

// 主题切换
$bgColor:var(--backgroundColor,rgb(255,255,255));
$fontColor:var(--fonntColor,rgb(0,0,0));
$bgmColor:var(--backgroundMColor,rgb(238,238,238));
$tableColor:var(--tableColor,rgb(218,218,218));
$borderColor:var(--borderColor,rgb(238,238,238));
$tablesColor:var(--tablesColor,rgb(255,255,255));
$inputColor:var(--inputColor,rgb(255,255,255))

 css: {
 loaderOptions: {
  // 此文件为主题切换文件
  sass: {
  prependData: `@import "./src/styles/_variable.scss";`,
  },
 },
 },

// 主题切换
const cut = (cutcheack) => {
 document.getElementsByTagName("body")[0].style.setProperty("--backgroundColor", cutcheack "#121212" : "#fff");
 document.getElementsByTagName("body")[0].style.setProperty("--fonntColor", cutcheack "#cecece" : "#333");
 document.getElementsByTagName("body")[0].style.setProperty("--backgroundMColor", cutcheack "#333" : "#eee");
 document.getElementsByTagName("body")[0].style.setProperty("--tableColor", cutcheack "#000" : "#d8d8d8");
 document.getElementsByTagName("body")[0].style.setProperty("--tablesColor", cutcheack "#222" : "#fff");
 document.getElementsByTagName("body")[0].style.setProperty("--inputColor", cutcheack "#666" : "#fff");
 document.getElementsByTagName("body")[0].style.setProperty("--borderColor", cutcheack "#666" : "#fff");
};
export default cut;

<!-- 首页 -->
<template>
<div class='home'>
  <el-switch v-model="cutcheack" active-color="#333" inactive-color="#13ce66" active-text="主题" @change="switchs"></el-switch>
</div>
</template>
<script>
import cut from "../../utils/publicStyle.js";
export default {
 name: "Home",
 data() {
 return {
  cutcheack: false, //主题切换
 };
 },
 methods: {
 // 左侧导航隐藏或显示
 // 切换主题
 switchs() {
  cut(this.cutcheack);
 },
 },
};
</script>
<style lang='scss' scope>
.home {
 height: 100%;
 width: 100%;
	background:$bgColor;
 .el-container {
  height: 100%;
  color:$fontColor;
 }
}
</style>