element-Cascader级联选择器用法？

<el-form-item label="行业选择" :label-width="formLabelWidth">
                    <div class="m-4">
                        <el-cascader v-model="form.tradeid" :options="options" :props="props" />
                    </div>
                </el-form-item>

const options = ref([]);
// 行业id
axios({
    url: '接口数据',
    params: {},
}).then(res => {
    console.log(res);
    options.value = res.data.data.map((item) => {
        return {
            value: item.name,
            label: item.name,
            children:
                item.children.length > 0
                    ? item.children.map((item2) => {
                        return {
                            value: item2.name,
                            label: item2.name,
                        }
                    }) : []
        };
    });
})