// 全局安裝腳手架工具
npm i vue-vli -g
// 驗(yàn)證腳手架工具安裝成功與否
vue --version
// 構(gòu)建項(xiàng)目
vue init webpack 項(xiàng)目名
// 測(cè)試vue項(xiàng)目是否運(yùn)行成功
npm run dev

// 安裝vuex
npm i vuex --save

// 進(jìn)入目錄
cd koa-demo
// 生成package.json
npm init -y
// 安裝以下依賴項(xiàng)
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的文件系統(tǒng)API
let fs = require('fs');

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

// 提供一個(gè)/getJson接口
router
  .get('/getJson', async ctx => {
    // 后端允許cors跨域請(qǐng)求
    await cors();
    // 返回給前端的數(shù)據(jù)
    ctx.body = JSON.parse(fs.readFileSync( './static/material.json'));
  
  });

// 將koa和兩個(gè)中間件連起來(lái)
app.use(router.routes()).use(router.allowedMethods());

// 監(jiān)聽3000端口
app.listen(3000);

// material.json文件

[{
  "id": 1,
  "date": "2016-05-02",
  "name": "張三",
  "address": "北京 清華大學(xué)",
}, {
  "id": 2,
  "date": "2016-05-04",
  "name": "李四",
  "address": "上海 復(fù)旦大學(xué)",
}, {
  "id": 3,
  "date": "2016-05-01",
  "name": "王五",
  "address": "廣東 中山大學(xué)",
}, {
  "id": 4,
  "date": "2016-05-03",
  "name": "趙六",
  "address": "廣東 深圳大學(xué)",
}, {
  "id": 5,
  "date": "2016-05-05",
  "name": "韓梅梅",
  "address": "四川 四川大學(xué)",
}, {
  "id": 6,
  "date": "2016-05-11",
  "name": "劉小律",
  "address": "湖南 中南大學(xué)",
}, {
  "id": 7,
  "date": "2016-04-13",
  "name": "曾坦",
  "address": "江蘇 南京大學(xué)",
}]

node server.js

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

<script>
  import {store} from '../vuex'
  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){
  // 調(diào)用我們的后端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'
    }
   }
  },