从零开始学习Node.js系列教程四：多页面实现数学运算的client端和server端示例

//通过监听3000端口使其作为Math Wizard的后台程序
var math = require('../nodejsExample3/math.js');
var express = require('express');
var app = express();
app.configure(function(){
  app.use(app.router);
  //默认的错误处理函数，显示栈轨迹
  //如果要显示用户友好的错误，app.err(function(err, req, res, next){
  // res.send(error page); //or res.render('template');
  // });
  app.use(express.errorHandler({
    dumpExceptions: true, showStack: true
  }));
});
app.get('/fibonacci/:n', function(req, res, next){
  math.fibonacciAsync(Math.floor(req.params.n), function(val){
    res.send({n: req.params.n, result: val});
  })
});
app.get('/factorial/:n', function(req, res, next){
  res.send({n: req.params.n, result: math.factorial(Math.floor(req.params.n))});
});
app.get('/mult/:a/:b', function(req, res, next){
  res.send({a: req.params.a, b: req.params.b, result: req.params.a * req.params.b});
});
app.get('/square/:a', function(req, res, next){
  res.send({a: req.params.a, result: req.params.a * req.params.a});
});
app.listen(3000);

var http = require('http');
var util = require('util');
[
  "/factorial/20","/factorial/20",
  "/mult/10/20","/square/12"
].forEach(function(path){
    var req = http.request({
      host: "localhost",
      port: 3000,
      path: path,
      method: 'GET'
    }, function(res){
      res.on('data', function(chunk){
        util.log('BODY: '   chunk);
      });
    });
    req.end();
});