ElementUI implements cascading selector

<el-cascader
        :disabled="isDisabled"
        :props="defaultParams"
        :options="options"
        v-model="selectedOptions"
        :show-all-levels="false"
        filterable
        :clearable="true"
      ></el-cascader>

data() {
   options: [],
      selectedOptions: [],
      defaultParams: {
        label: "name",
        value: "code",
        children: "children",
      },
},
created() {
 listArea(330000).then((response) => {
       console.log(response);
       this.options = this.getTreeData(response);
       this.loading = false;
     });
},
methods: {
 // Recursively eliminate empty arrays getTreeData(data) {
      // Loop through json data for (var i = 0; i < data.length; i++) {
        if (data[i].children.length < 1) {
          // If children is an empty array, set children to undefined
          data[i].children = undefined;
        } else {
          // If children is not an empty array, continue to recursively call this method this.getTreeData(data[i].children);
        }
      }
      return data;
    }
}