node.js - 如何在 node.js 中导出带有添加原型(prototype)方法的对象

Question

我在一个文件中有一个对象，我希望能够请求该文件，然后随心所欲地创建该对象的新实例，但我遇到了麻烦。这看起来非常基础，我错过了什么。

hat.js

function Hat(owner) {
    this.owner = owner;
}
Hat.prototype.tip = function() {
    console.log("and he (" + owner + ") tipped his hat, just like this");
}
exports.Hat = Hat;

Node 终端

尝试 1

> require('./hat.js');
> var mighty_duck = new Hat('Emilio');
  ReferenceError: Hat is not defined

尝试 2

> var Hat = require('./hat.js');
> var mighty_duck = new Hat('Emilio');
  { owner: 'Emilio' }
> mighty_duck.tip();
  TypeError: Object #<Hat> has no method 'tip'

编辑

最不幸的是，我遗漏了后来证明是最大问题的部分。我试图使用的事实

util.inherits(Hat, EventEmitter);

所以我的 hat.js 实际上是

function Hat(owner) {
    this.owner = owner;
}
Hat.prototype.tip = function() {
    console.log("and he (" + owner + ") tipped his hat, just like this");
}
util.inherits(Hat, EventEmitter);
exports.Hat = Hat;

这是一个问题，因为显然在开始扩展原型(prototype)之前调用inherits 很重要。修复很简单，移动 inherits 调用几行

function Hat(owner) {
    this.owner = owner;
}
util.inherits(Hat, EventEmitter);
Hat.prototype.tip = function() {
    console.log("and he (" + owner + ") tipped his hat, just like this");
}
exports.Hat = Hat;

Answer 1

看看这里:http://openmymind.net/2012/2/3/Node-Require-and-Exports/

你可以试试这个:

function Hat(owner) {
    this.owner = owner;
}
Hat.prototype.tip = function() {
    console.log("and he (" + this.owner + ") tipped his hat, just like this");
}
module.exports = Hat;

然后……像这样:

var hat = require('./hat.js');
var mighty_duck = new hat('Emilio');
mighty_duck.tip()