Node.js搭建简单服务器教程

用Node.js搭建一个简单服务器其实蛮，适合初学者或想快速搞定原型的开发者。只要你会点 JavaScript，就能在服务器端写代码，完全不需要担心后端语言。你需要用到几个核心模块：url、path、fs和http。url模块帮你解析 HTTP 求中的路径，path模块文件路径，fs模块文件系统的操作，http模块则是用来创建服务器的。代码也简单，像这样：

'use strict';
const url = require('url');
const path = require('path');
const fs = require('fs');
const http = require('http');

const root = process.argv[2] ? path.resolve(process.argv[2]) : path.resolve('.');
console.log('本地根目录:', root);
const server = http.createServer((request, response) => {
  const pathname = url.parse(request.url).pathname;
  const filepath = path.join(root, pathname);
  fs.stat(filepath, (err, stat) => {
    if (!err && stat.isFile()) {
      console.log(`200 ${request.url}`);
      response.writeHead(200);
      fs.createReadStream(filepath).pipe(response);
    } else {
      console.log(`404 ${request.url}`);
      response.writeHead(404);
      response.end('404 Not Found');
    }
  });
});
server.listen(8080);
console.log('服务器正在运行于 http://127.0.0.1:8080/');