NodeJs 使用express在本地请求后台服务接口

express

基于 Node.js 平台，快速、开放、极简的 Web 开发框架
```
npm init -y
```
```
npm i express cors
```

编写 server.js 文件

const mysql = require('mysql');
const express = require('express');
const cors = require('cors'); // 解决跨域
const app = express();
app.use(cors());
const connection = mysql.createConnection({
  host     : '172.16.101.222', // 数据库ip
  user     : 'name', // 数据库用户名
  password : 'mima', // 数据库密码
  database: 'dataBase' // 数据库名称
});
connection.connect();
app.get('/server', (req, res) => {
  connection.query("SELECT * from med_alias_copy where alias='紫金'", function (error, results, fields) {
    if (error) throw error;
    console.log(results);
    res.status(200).json(results);
  });
})

// 前端项目访问接口的地址
const hostname = '127.0.0.1';
const port = 9000;
app.listen(port, hostname, () => {
  console.log(`❗❗❗ Server is running at http://${hostname}:${port}/`)
})

在Vue应用中使用

import axios from 'axios'
const state = {
  products: []
}
const getters = {}
const mutations = {
  setProducts(state, payload) {
    state.products = payload
  }
}
const actions = {
  async getProducts({ commit }) {
    try {
      const { data } = await axios({
        method: 'GET',
        url: 'http://127.0.0.1:3000/products'
      })
      commit('setProducts', data)
    } catch (err) {
      // eslint-disable-next-line no-undef
      $vue.$message.error(err.toString())
    }
  }
}

export default {
  namespaced: true,
  state,
  getters,
  actions,
  mutations
}