nodejs 快速创建web应用

yarn构建

第一步：yarn init 初始化 工程 会生成一个packson.json文件

{
  "name": "sample-nodejs",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    
  }
}

第二步：yarn add express.js

{
  "name": "sample-nodejs",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "express": "^4.17.2"
  }
}

第三步：创建server.js 读取json文件

var express = require('express');
 var app = express();
 var fs = require("fs");


app.get('/get', function (req, res) {
  let rawdata = fs.readFileSync('test.json');
  let student = JSON.parse(rawdata);
  res.json(student);
})


 var server = app.listen(8081, function () {
  var host = server.address().address
  var port = server.address().port
  console.log("应用实例，访问地址为 http://%s:%s", host, port)
})

第四步：node server.js