创建一个组件文件里面引入：

export default function ThemeColor(){
    document.body.style.setProperty('--el-color-primary', '#27ba9b')//主色
    document.body.style.setProperty('--el-color-success', '#1dc779')//成功色
    document.body.style.setProperty('--el-color-waring', '#ffb302')//警告色
    document.body.style.setProperty('--el-color-danger', '#e26237')//危险色
    document.body.style.setProperty('--el-color-danger', '#cf4444')//错误色
}

 在App.vue中引入:

<template>
  <el-row>
  <el-button>默认按钮</el-button>
  <el-button type="primary">主要按钮</el-button>
  <el-button type="success">成功按钮</el-button>
  <el-button type="info">信息按钮</el-button>
  <el-button type="warning">警告按钮</el-button>
  <el-button type="danger">危险按钮</el-button>
</el-row>
</template>

<script setup>
import { onMounted } from 'vue'
import ThemeColor from './utils/ThemeColor'
onMounted(() => {
  ThemeColor()
})

</script>

<style lang="scss" scoped>

</style>

成功了给个赞吧