Node使用`express`做简易数据测试服务

nodeexpress如何写接口,node中使用mysql

初始化项目

1. 执行 `npm init`

2. 添加启动服务命令`"start": "node app.js"`到`scripts`节点下,`npm start`就为配置后的启动命令

3. 添加依赖`"express": "^4.16.3"`到`dependencies`节点下

4. 安装依赖 `npm i`

配置项目

    //导入相关模块
    const express = require("express");
    const path = require("path");
    const app = express();

    //请根目录创建`public`文件夹,并添加`index.html`为首页面
    app.use(express.static(path.resolve(__dirname,"public")));

    //================↓=↓=↓=↓=↓=配置接口信息=↓=↓=↓=↓=↓================
    app.use("/getUserInfo",require("./router/userInfo"))
    //================↑=↑=↑=↑=↑=配置接口信息=↑=↑=↑=↑=↑================

    const port = 3000;
    //服务监听
    app.listen(port,()=>{
        console.log(`server running @http://localhost:${port}`);
    });

    module.exports = app;

根目录创建`router`目录,初始化内容

//导入相关依赖
const express = require("express");
const router = express();

//配置路由
router.get("/",(req,res) => {

  //get请求参数读取
  //const shopId = req.query.shopId;
  //console.log(shopId);

  //组装返回数据
  let data = {
    "code":"0",
    "message":"success",
    "data":[
      {
        "name":"张三",
      },
      {
        "name":"李四",
      },
      {
        "name":"王五",
      },
    ]
  };
  //发送需要返回到前端的数据
  res.send(data);
});

module.exports = router;

复杂版POST请求

//导入相关依赖
const express = require("express");
const router = express();
let bodyParser = require('body-parser');
let urlencoderParser = bodyParser.urlencoded({extended:false});

//拼装返回数据中的部分信息
const base_url = "http://127.0.0.1:3000/images/goods/";

//配置路由
router.post("/",urlencoderParser,(req,res) => {
  //post请求参数读取
  let shopId = req.body.shopId;
  console.log(shopId);

  //组装返回数据
  let goods = {
    "code":"0",
    "message":"success",
    "data":[
      {
        "name": "法国代购新款江疏影同款翻领修身中长裙春夏印花连衣裙",
        "image": base_url + "001/cover.jpg",
        "presentPrice": 98.88,
        "goodsId": "001",
        "oriPrice": 108.88
      }, {
        "name": "柔美而精致~高贵而优雅~圆领金银丝春季毛衣羊毛开衫女短款白外套",
        "image": base_url + "002/cover.jpg",
        "presentPrice": 229.90,
        "goodsId": "002",
        "oriPrice": 320.99
      }
    ]
  };

  res.send(goods);
});

    //发送需要返回到前端的数据
    module.exports = router;

访问图片`http://localhost:3000/images/goods/001/1.jpg`

在public目录下增加images/goods/001目录并在001目录下添加名称为1.jpg图片

node与express开发 (node express操作数据库)

Node使用`express`做简易数据测试服务