Node js object exports | 易学教程

问题

Got a pretty simple question to which I cant find an answer regarding exporting a object form a module in Node js, more specifically accessing the objects properties.

Here is my object I export:

exports.caravan = {
    month: "july"
};

And here is my main module:

var caravan = require("./caravan")

console.log(caravan.month);
console.log(caravan.caravan.month);

Why cant I access the properties directly with caravan.month but have to write caravan.caravan.month?

回答1:

Consider that with require, you gain access to the module.exports object of a module (which is aliased to exports, but there are some subtleties to using exports that make using module.exports a better choice).

Taking your code:

exports.caravan = { month: "july" };

Which is similar to this:

module.exports.caravan = { month: "july" };

Which is similar to this:

module.exports = {
  caravan : { month: "july" }
};

If we similarly "translate" the require, by substituting it with the contents of module.exports, your code becomes this:

var caravan = {
  caravan : { month: "july" }
};

Which explains why you need to use caravan.caravan.month.

If you want to remove the extra level of indirection, you can use this in your module:

module.exports = {
  month: "july"
};

回答2:

If you want to get via caravan.month then:

module.exports = {
    month: "july"
};

回答3:

If you want to get the object, use

module.exports = {
  caravan = {
       month: "july"
  }
};

and then get it like this:

var caravan = require("./caravan")

You may also check:

console.log(caravan.caravan.month);

来源：https://stackoverflow.com/questions/38283777/node-js-object-exports

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javascript

node.js

node-modules