node.js - 在nodejs中包含对象

Question

我正在尝试在项目中使用nodejs，并且需要包含一个包含对象的文件。仅仅包含在内是行不通的。我一直在研究并发现我必须将文件转换为模块。从那里我添加了“var Generator = require('./generator.js');”行到“app.js”和“exports.Generator = new Generator();”文件包含，但导致此错误:

D:\Users\Miguel Borges\Dropbox\Trabalhos\Lero Lero\nodejs\app.js:14
        var phrase = generator.generatePhrases(1);
                               ^ 
TypeError: Object #<Object> has no method 'generatePhrases'
    at Server.<anonymous> (D:\Users\Miguel Borges\Dropbox\Trabalhos\Lero Lero\nodejs\app.js:14:25)
    at Server.EventEmitter.emit (events.js:91:17)
    at HTTPParser.parser.onIncoming (http.js:1783:12)
    at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:111:23)
    at Socket.socket.ondata (http.js:1680:22)
    at TCP.onread (net.js:410:27)

编辑

现在，根据 @Brandon Tilley 的回答，错误是:

D:\Users\Miguel Borges\Dropbox\Trabalhos\Lero Lero\nodejs\app.js:20
console.log(g.Generator.generatePhrases(1));
                        ^
TypeError: Cannot call method 'generatePhrases' of undefined
    at Object.<anonymous> (D:\Users\Miguel Borges\Dropbox\Trabalhos\Lero Lero\nodejs\app.js:20:25)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

app.js

var uri = '127.0.0.1';
var port = 8001;

var http = require('http');
var url = require('url');
var g = require('./generator.js');

http.createServer(function (request, response) {
    response.writeHead(200, {'Content-Type': 'text/plain'});

    var path = url.parse(request.url).pathname;
//  var generator = new g.Generator();

    var phrase = g.Generator.generatePhrases(1);

    response.end(path + '\n' + phrase);
}).listen(port, uri);

console.log('Server running at http://' + uri + ':' + port + '/');
console.log(g.Generator.generatePhrases(1));

generator.js

function Generator () {

}

Generator.prototype.generatePhrases = function(nrPhrases) {
    return 'hi ' + nrPhrases;
};

// exports.Generator = new Generator();

Answer 1

您需要module.exports = new Generator()。按照现在的写法，您需要:

var generator = require('./generator');
generator.Generator.generatePhrases(1);

因为

exports.Generator = new Generator();

表示:“当我需要此模块时，我需要一个具有名为 Generator 的属性的对象；该属性是 Generator 的实例，并且具有 generatePhrases 方法。 ”

看看my screencast on modules如果您需要有关 module.exports 工作原理的更多说明。