vue create admin
cd admin
npm run serve

npm install axios
npm install -D axios-mock-adapter mockjs

const routes: Array<RouteRecordRaw> = [
 {
  path: '/',
  name: 'Home',
  component: Home,
 },
 {
  path: '/about',
  name: 'About',
  component: () => { return import(/* webpackChunkName: "about" */ '../views/About.vue'); },
 },
 {
  path: '/list',
  name: 'List',
  component: () => { return import(/* webpackChunkName: "list" */ '../views/List.vue'); },
 },
];

<template>
  <div class='content_page'>
    <div class='content_body'>
      <div class='content_button'>
        <button class='add primary' @click='addItem' title='添加'>添加</button>
      </div>
      <div class='content_table'>
        <table>
          <thead>
            <tr>
              <th v-for='item in thead' :key='item'>{{item}}</th>
            </tr>
          </thead>
          <tbody>
            <tr v-for='(item, index) in list' :key='item.id'>
              <td>
                <span :title='item.id'>{{item.id}}</span>
              </td>
              <td>
                <div v-if='index === currentIndex'>
                  <input
                    v-model='item.name'
                    title='name'
                  />
                </div>
                <span :title='item.name' v-else>{{item.name}}</span>
              </td>
              <td :title='item.sex'>
               <div v-if='index === currentIndex'>
                  <input
                    v-model='item.sex'
                    title='sex'
                  />
                </div>
                <span :title='item.sex' v-else>{{item.sex "htmlcode">

import { ref, onMounted } from 'vue';
import {ItemType, FetchType, DeleteType, AddType, EditType} from '../../types/index';

export const compositionApi = (
 fetchApi: FetchType,
 deleteApi: DeleteType,
 confirmAddApi: AddType,
 confirmEditApi: EditType,
 itemData: ItemType,
) => {
 const currentIndex = ref<number | null>(null);
 const list = ref([{}]);
 const getList = () => {
  fetchApi().then((res: any) => {
   list.value = res.data.list;
  });
 };
 const addItem = () => {
  list.value.unshift(itemData);
  currentIndex.value = 0;
 };
 const editItem = (index: number) => {
  currentIndex.value = index;
 };
 const deleteItem = (index: number, item: ItemType) => {
  deleteApi(item).then(() => {
   list.value.splice(index, 1);
  //  getList();
  });
 };
 const cancel = (item: ItemType) => {
  currentIndex.value = null;
  if (!item.id) {
   list.value.splice(0, 1);
  }
 };
 const confirm = (item: ItemType) => {
  const api = item.id "htmlcode">

<script lang='ts'>
import axios from 'axios';
import { defineComponent, reactive } from 'vue';
import { compositionApi } from '../components/composables/index';
import {ItemType} from '../types/index';

const ListComponent = defineComponent({
 name: 'List',
 setup() {
  const state = reactive({
   itemData: {
    id: '',
    name: '',
    sex: 0,
    birth: '',
    address: '',
   },
  });
  const fetchApi = () => {
   return axios.get('/users');
  };
  const deleteApi = (item: ItemType) => {
   return axios.post('/users/delete', { id: item.id });
  };
  const confirmAddApi = (item: ItemType) => {
   return axios.post('/users/add', { 
    name: item.name,
    birth: item.birth,
    address: item.address,
   });
  };
  const confirmEditApi = (item: ItemType) => {
   return axios.post('/users/edit', {
    id: item.id,
    name: item.name,
    birth: item.birth,
    address: item.address,
   });
  };
  const localPageData = compositionApi(fetchApi, deleteApi, confirmAddApi, confirmEditApi, state.itemData);
  return {
   state,
   ...localPageData,
  };
 },
 data() {
  return {
   thead: [
    'id',
    'name',
    'sex',
    'birth',
    'address',
    'option',
   ],
  };
 }
});




这样 List 页面的逻辑基本上就完成了。同样，About 页面的逻辑也就完成了，不同的就是在 About 页面更改一下接口请求的地址。
最终实现效果



composition API vs Mixin


在vue3之前，代码复用的话一般都是用mixin，但是mixin相比于composition API的劣势，在官网中的解释如下：

  
mixin很容易发生冲突：因为每个特性的属性都被合并到同一个组件中，所以为了避免 property名冲突和调试，你仍然需要了解其他每个特性。
  
可重用性是有限的：我们不能向mixin传递任何参数来改变它的逻辑，这降低了它们在抽象逻辑方面的灵活性

源代码


项目中用到的一些 TS 接口的定义、模拟数据及接口请求本文中没有具体介绍，如果想了解的话可以去看看源码。
戳这里：vue3_ts_admin