How to build a development environment using vue+vuex+koa2

// 全局安装脚手架工具
npm i vue-vli -g
// 验证脚手架工具安装成功与否
vue --version
// 构建项目
vue init webpack 项目名
// 测试vue项目是否运行成功
npm run dev

// 安装vuex
npm i vuex --save

// 进入目录
cd koa-demo
// 生成package.json
npm init -y
// 安装以下依赖项
npm i koa
npm i koa-router
npm i koa-cors

// server.js文件

let Koa = require('koa');
let Router = require('koa-router');

let cors = require('koa-cors');
// 引入modejs的文件系统API
let fs = require('fs');

const app = new Koa();
const router = new Router();

// 提供一个/getJson接口
router
  .get('/getJson', async ctx => {
    // 后端允许cors跨域请求
    await cors();
    // 返回给前端的数据
    ctx.body = JSON.parse(fs.readFileSync( './static/material.json'));
  
  });

// 将koa和两个中间件连起来
app.use(router.routes()).use(router.allowedMethods());

// 监听3000端口
app.listen(3000);

// material.json文件

[{
  "id": 1,
  "date": "2016-05-02",
  "name": "张三",
  "address": "北京 清华大学",
}, {
  "id": 2,
  "date": "2016-05-04",
  "name": "李四",
  "address": "上海 复旦大学",
}, {
  "id": 3,
  "date": "2016-05-01",
  "name": "王五",
  "address": "广东 中山大学",
}, {
  "id": 4,
  "date": "2016-05-03",
  "name": "赵六",
  "address": "广东 深圳大学",
}, {
  "id": 5,
  "date": "2016-05-05",
  "name": "韩梅梅",
  "address": "四川 四川大学",
}, {
  "id": 6,
  "date": "2016-05-11",
  "name": "刘小律",
  "address": "湖南 中南大学",
}, {
  "id": 7,
  "date": "2016-04-13",
  "name": "曾坦",
  "address": "江苏 南京大学",
}]

node server.js

<template>
  <p class="test">
    <button type="button" @click="getJson">从后端取json</button>
    <p class="showJson">{{json}}</p>
  </p>
</template>

<script>
  import {store} from &#39;../vuex&#39;
  export default {
    computed: {
     json(){
       return store.state.json;
     }
    },
    methods: {
     getJson(){
       store.dispatch("getJson");
     }
    }
  }
</script>

<style scoped>
 .showJson{
  width:500px;
  margin:10px auto;
  min-height:500px;
  background-color: palegreen;
 }
</style>

import Vue from 'vue'
import Vuex from 'vuex';

Vue.use(Vuex)
const state = {
  json: [],
};

const mutations = {
 setJson(state, db){
  state.json = db;
 }
}

const actions = {
 getJson(context){
  // 调用我们的后端getJson接口
  fetch('http://127.0.0.1:3000/json', {
   method: 'GET',
   // mode:'cors',
   headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
   },
  }).then(function (res) {
   if(res.status === 200){
    return res.json()
   }
  }).then(function (json) {

   //console.log(typeof Array.from(json), Array.from(json));
   context.commit('setJson', Array.from(json));
  })
 }
};

export const store = new Vuex.Store({
 state: state,
 mutations: mutations,
 actions: actions,
})

npm i axios
import axios from 'axios'

const actions = {
 getJson(context){
  axios.get('/json', {
   method: 'GET',
   // mode:'cors',
   headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
   },
  }).then(function (res) {
   if(res.status === 200){
    return res.data
   }
  }).then(function (json) {

   //console.log(typeof Array.from(json), Array.from(json));
   context.commit('setJson', Array.from(json));
  })
 }
};

proxyTable: {
   '/json': {
    target: 'http://127.0.0.1:3000',
    changeOrigin: true,
    pathRewrite: {
     '^/json': '/json'
    }
   }
  },