请给出使用Vue3和ts以树形表格读取后端数据的完整代码

在Vue3中，我们可以使用Vuex来管理数据，配合axios获取后端数据，然后展示在一个树状表格里。下面是一个简单的例子，包括数据获取、Vuex存储以及动态渲染树形结构：

**1. 安装必要的依赖**

npm install axios vuex typescript axios v-model-loading

**2. 配置Vuex store**

// src/store/index.ts
import { createStore } from "vuex";
import axios from "axios";

const store = createStore({
  state: {
    treeData: [],
    loading: true,
    error: null,
  },
  mutations: {
    SET_TREE_DATA(state, data) {
      state.treeData = data;
      state.loading = false;
    },
    SET_LOADING(state, loading) {
      state.loading = loading;
    },
    SET_ERROR(state, error) {
      state.error = error;
    },
  },
  actions: {
    fetchData({ commit }) {
      commit("SET_LOADING", true);
      axios.get("/api/tree-data")
        .then((response) => {
          commit("SET_TREE_DATA", response.data);
        })
        .catch((error) => {
          commit("SET_ERROR", error.message);
        });
    },
  },
});

export default store;

**3. 主要组件模板 (例如App.vue)**

<template>
  <v-app>
    <v-container>
      <v-row justify="center" align="top">
        <v-loading :active="$store.state.loading" spinner>
          <v-data-treeview :items="treeData" :key-as="id" />
        </v-loading>
        <div v-if="$store.state.error">
          <span>Error: {{ $store.state.error }}</span>
        </div>
      </v-row>
    </v-container>
  </v-app>
</template>

<script lang="ts" setup>
import { ref, onMounted } from 'vue';
import { useStore } from '@/store';
import VDataTreeview from 'v-data-treeview';

const store = useStore();
let treeData = ref([]);

onMounted(() => {
  store.dispatch('fetchData');
});
</script>

**4. 树节点模型（假设后端返回的是类似这种的数据结构）**

{
  id: "1",
  name: "根节点",
  children: [
    {
      id: "2",
      name: "子节点1"
      // 更深一层的子节点...
    }
  ]
}