vue3+elementui的el-cascader 选择器组合

<template>
    <div>
       <el-cascader
            @change='changeCascader'
            :props="props"
            clearable></el-cascader>
    </div>
</template>
<script setup>
import { ref } from '@vue/reactivity'
let id = 0;
const props = ref({
    checkStrictly: true ,
    lazy:true,
    lazyLoad(node,resolve){
        const { level } = node;
        if(level == 0){
            // 第一层
            resolve([{value:'1',label:'选项1',leaf: level >= 2}]);
        }
        if(level == 1){
            // 第一层
            resolve([{value:'1-1',label:'选项1-1',leaf: level >= 2}]);
        }
        if(level == 2){
            // 第一层
            resolve([{value:'1-1-1',label:'选项1-1-1',leaf: level >= 2}]);
        }
    }
})
</script>