4dkankan-components/docs/examples/select/grouping.vue

<template>
    <el-select v-model="value" placeholder="Select">
        <el-option-group v-for="group in options" :key="group.label" :label="group.label">
            <el-option v-for="item in group.options" :key="item.value" :label="item.label" :value="item.value" />
        </el-option-group>
    </el-select>
</template>

<script lang="ts" setup>
import { ref } from 'vue'

const value = ref('')
const options = [
    {
        label: 'Popular cities',
        options: [
            {
                value: 'Shanghai',
                label: 'Shanghai',
            },
            {
                value: 'Beijing',
                label: 'Beijing',
            },
        ],
    },
    {
        label: 'City name',
        options: [
            {
                value: 'Chengdu',
                label: 'Chengdu',
            },
            {
                value: 'Shenzhen',
                label: 'Shenzhen',
            },
            {
                value: 'Guangzhou',
                label: 'Guangzhou',
            },
            {
                value: 'Dalian',
                label: 'Dalian',
            },
        ],
    },
]
</script>