ant-design-vue/examples/App.vue

<template>
  <a-tree-select
    v-model:value="value"
    style="width: 100%"
    :dropdown-style="{ maxHeight: '400px', overflow: 'auto' }"
    :tree-data="treeData"
    placeholder="Please select"
    tree-default-expand-all
  >
    <template #title="{ key, value }">
      <span v-if="key === '0-0-1'" style="color: #08c">Child Node1 {{ value }}</span>
    </template>
  </a-tree-select>
</template>
<script lang="ts">
import { defineComponent, ref, watch } from 'vue';

interface TreeDataItem {
  value: string;
  key: string;
  title?: string;
  slots?: Record<string, string>;
  children?: TreeDataItem[];
}

const treeData: TreeDataItem[] = [
  {
    title: 'Node1',
    value: '0-0',
    key: '0-0',
    children: [
      {
        value: '0-0-1',
        key: '0-0-1',
        slots: {
          title: 'title1',
        },
      },
      {
        title: 'Child Node2',
        value: '0-0-2',
        key: '0-0-2',
      },
    ],
  },
  {
    title: 'Node2',
    value: '0-1',
    key: '0-1',
  },
];
export default defineComponent({
  setup() {
    const value = ref<string>();

    watch(value, () => {
      console.log(value.value);
    });
    return {
      value,
      treeData,
    };
  },
});
</script>