我可以以原型方式在Node.js中使用require（）吗？

Question

I've been interested in prototypical programming with JavaScript, and I'm trying to figure out an efficient way of doing it with Node modules.

For example, I'd like to use a prototype to quickly create a debug object in each of my modules, which has a name property and a log method, constructed via:

custom_modules/debug.js

var settings = require('custom_modules/settings');

exports = function debug(name){

    this.name = name;
    this.log = function(message){

        if (settings.debug == 'true'){

             console.log("[Debug][" + name + "]: " + message);

        }

    }

}

So I'd like to know if I can use that module as a constructor, like so:

do_something.js

var debug = new require('custom_modules/debug')("Something Doer");

debug.log("Initialized"); // -> [Debug][Something Doer] : Initialized

Will it work? If not, what's the correct equivalent?

Answer 1

new doesn't care where the function comes from. So yes, the function can be the result of require ing a module.

However, the module must directly export the function. In your current code you are merely assigning a new value to the local exports variable, and we all know that assigning to a local variable doesn't have any effect outside of its scope.

The module will still export an empty object. You have to override the exports property of the module :

module.exports = function() {...};

---

As pointed out, there will be problems with precedence, so you would have to do

var debug = new (require('custom_modules/debug'))("Something Doer");