html

<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>

script

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,}}) : []};});})

效果：