一个简单的 express 路由实现

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const http = require("http");
const url = require("url");

class Express {
  router = {};
  constructor() {
    this.server = http.createServer((req, res) => {
      const pathName = url.parse(req.url).path;
      if (pathName !== "/favicon.ico") {
        if (
          this.router[pathName] &&
          typeof this.router[pathName] === "function"
        ) {
          // 回传 req 和 res，实际定义 get/post 路由的地方就能拿到
          this.router[pathName](req, res);
        } else {
          res.writeHead(404, { "content-type": "text/html; charset=UTF-8" });
          res.end("路由未定义");
        }
      }
    });
  }
  get(path, callback) {
    this.router[path] = callback;
  }
  listen(port) {
    this.server.listen(port);
  }
}

使用

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const app = new Express();
app.get("/xxx", (req, res) => {
  res.writeHead(200, { "content-type": "text/html; charset=UTF-8" });
  res.end("get");
});
app.listen(3000);