将参数传递给 require(加载模块时) [英] Passing arguments to require (when loading module)

问题描述

是否可以在使用 require 加载模块时传递参数?

Is it possible to pass arguments when loading a module using require?

我有提供登录功能的模块 login.js.它需要一个数据库连接，我希望在我的所有模块中使用相同的数据库连接.现在我导出一个函数 login.setDatabase(...) ，它让我指定一个数据库连接，它工作得很好.但我宁愿在加载模块时传递数据库和任何其他要求.

I have module, login.js which provides login functionality. It requires a database connection, and I want the same database connection to be used in all my modules. Now I export a function login.setDatabase(...) which lets me specify a database connection, and that works just fine. But I would rather pass the database and any other requirements when I load the module.

var db = ...
var login = require("./login.js")(db);

我对 NodeJS 很陌生，通常使用 Java 和 Spring 框架进行开发，所以是的...这是构造函数注入:) 是否可以执行我上面提供的代码之类的操作?

I am pretty new with NodeJS and usually develop using Java and the Spring Framework, so yes... this is a constructor injection :) Is it possible to do something like the code I provided above?

推荐答案

根据您在这个答案中的评论，我做你想做的事情:

Based on your comments in this answer, I do what you're trying to do like this:

module.exports = function (app, db) {
    var module = {};

    module.auth = function (req, res) {
        // This will be available 'outside'.
        // Authy stuff that can be used outside...
    };

    // Other stuff...
    module.pickle = function(cucumber, herbs, vinegar) {
        // This will be available 'outside'.
        // Pickling stuff...
    };

    function jarThemPickles(pickle, jar) {
        // This will be NOT available 'outside'.
        // Pickling stuff...

        return pickleJar;
    };

    return module;
};

我几乎所有的模块都是这样构建的.似乎对我来说效果很好.

I structure pretty much all my modules like that. Seems to work well for me.

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