如何从 Object 导出数据？

Question

I am trying to export an object called coffeeTree from a file called Coffee_Tree.js into a js file called coffee.js so I can grab data from the object. But, I keep getting this:

Uncaught ReferenceError: coffee is not defined at Coffee_Tree.js:2

This is the code I have so Far, I am still A js beginner, But I can't figure out what to do I changed the html type to module, but that didn't work. Here's my code so far:

Coffee_Tree.js

export default coffeeTree = {
    refill: () => {
        coffee.isEmpty = false;
        console.log('refilled');
    },
    drink: () => {
        coffee.isEmpty = true;
        console.log('chug');
    },
    isEmpty: true,
}

coffee.js

import coffeeTree from './Coffee_Tree.js';

console.log(coffeeTree);

Again in the Console I just keep getting this error:

Uncaught ReferenceError: coffee is not defined
    at Coffee_Tree.js:2

Answer 1

You need to

(1) use the proper variable name (either coffeeTree or coffee - pick one, don't use both)

(2) An expression exported as default does not get put into the current scope as an identifier. You're currently implicitly creating a global variable and running in sloppy mode. One of the main purposes of having a module system is to avoid global variables when possible. Use named exports instead so that the object can reference itself inside its methods, and without assigning to the global object:

export const coffee = {
    refill: () => {
        coffee.isEmpty = false;
        console.log('refilled');
    },
    drink: () => {
        coffee.isEmpty = true;
        console.log('chug');
    },
    isEmpty: true,
};

import { coffee } from './Coffee_Tree.js';
console.log(coffee);

(I'd also highly recommend using strict mode, if at all possible - if you read the error messages and try to debug them, it'll help you avoid these sorts of mistakes)