node模块

node 模块

1.核心模块：内置的，开箱即用

http
  .createServer(function (request, response) {
    response.writeHead(200, { "Content-Type": "text/html; charset=utf-8" });
    response.end("<h2 style='color:red'>今天的天气真好!</h2>");
  })
  .listen(8081);
console.log("Server running at http://127.0.0.1:8081/");

http
  .createServer(function (request, response) {
     response.writeHead(200, { "Content-Type": "application/json" });
     response.end(`
     {
         "id":925,
         "user":"李同学",
         "qq邮箱":"123456789@qq.com"
     }
     `);
  })
  .listen(8081);
console.log("Server running at http://127.0.0.1:8081/");

const fs = require("fs");
fs.readFile(__dirname + "/libin.txt", function (err, data) {
  if (err) return console.error(err);
  console.log(data.toString());
});

2.文件模块：自定义的先声明，在导入

module.exports = {
  domain: "WWW.php.cn",
  name: "PHP中文网",
  getSite() {
    return this.name + "(" + this.domain + ")";
  },
};

let site = require("./m1.js");
3.第三方模块：npm安装的