JavaScript将数组从一个文件导出到另一个文件以供使用。 Node.js的

Question

Perhaps you can help. I have a file the is listing the DIR then pushing it to an array. I'm then trying to export it and use it in another file. But its not working....

File 1.js

const fs = require('fs');
let filename = [];
module.exports = function(){


try {
    let subfolder = './DIR/';
    fs.readdir(subfolder, async (err, files) => {
        for (const file of files) {
            filename.push(file);
        }

    });
}
catch (e) {}
};

File 2.js

let instance = require('../../File 2');
console.log(instance);

However when I run this I get an empty array back. however I can console.log within the file 1.js for the array and it shows correctly. Not sure what I'm doing wrong.

Answer 1

1. You're exporting a function, not an array.
2. The array will be filled asynchronously. When you console.log in File 2.js , the array will still be empty.

Answer 2

Result was changing File 1.js to be the following:

const fs = require('fs');

module.exports = 
{
    getRArray: function ()
    {
        let filename = [];
        try
        {
            let subfolder = './DIR/';
            let files = fs.readdirSync(subfolder);

            for (let file of files)
            {
                filename.push(file);
            }
        }
        catch (e)
        {
        }
        return filename;
    }
};

with File 2.js

let instance = require('../../DIR');
console.log(instance.getRArray());