使用 node.js 导出类

Exporting classes with node.js(使用 node.js 导出类)

问题描述

我在一个名为 bob_test.spec.js

require('./bob');

describe("Bob", function() {
  var bob = new Bob();

  it("stating something", function() {
    var result = bob.hey('Tom-ay-to, tom-aaaah-to.');
    expect(result).toEqual('Whatever');
  });
});

为了使测试通过，我在一个名为 bob.js

In order to make the test pass, I've written the following production code in a file called bob.js

"use strict";

var Bob = function() {
}

Bob.prototype.hey = function (text) {
  return "Whatever";
}

module.exports = Bob;

当我运行测试时 - 使用 jasmine-node . - 我得到以下信息F

When I run the test - using jasmine-node . - I get the following F

Failures:

1) Bob encountered a declaration exception
Message:
    ReferenceError: Bob is not defined
Stacktrace:
    ReferenceError: Bob is not defined
    at null.<anonymous> (/Users/matt/Code/oss/deliberate-practice/exercism/javascript/bob/bob_test.spec.js:4:17)
    at Object.<anonymous> (/Users/matt/Code/oss/deliberate-practice/exercism/javascript/bob/bob_test.spec.js:3:1)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)

Finished in 0.02 seconds
1 test, 1 assertion, 1 failure, 0 skipped

根据我对 Javascript 的了解，我觉得这应该可行.node.js 与构造函数和模块导出有什么不同，阻止它工作我认为它应该?

Based on what I understand about Javascript, I feel like this should work. What does node.js do differently with constructor functions and module exports that prevents this from working I like think it should?

推荐答案

require返回一个对象，你应该把它存储在某个地方

require returns an object, you should store it somewhere

var Bob = require('./bob');

然后使用这个对象

var bobInstance = new Bob();

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