【Node.js】exports與require

//myfirstmodule.js
exports.myDateTime = function () {
    return Date();
};


//0217.js
var http = require('http');
var date = require('./myfirstmodule');

http.createServer(function (req, res) {
    res.writeHead(200, {
        'Content-Type': 'text/html; charset=utf-8',
    });
    res.write(date.myDateTime());
    res.end();
}).listen(8080);