如何强制一个带有嵌套 if 语句的代码块在 node.js 中的后续代码之前完成？

Question

In the following block of code, I want all the statements below readdir to execute before the final statement, so that the final console log includes the entire database. I've tried running with readdir sync, and that doesn't seem to work either. Is it something to do with the nested if statements? The last line executes before any of the other code, and I'd like to circumvent that.

// Load node.js filesystem module
var fs = require('fs');
// Load cheerio module for HTML scraping
const cheerio = require('cheerio');
// Load find and replace module
const replace = require('replace-in-file');
// Make for loop that cycles through all files in folder
var stream = fs.createWriteStream("my_file.txt");

var database = {};

const CurrentFolder = './';
fs.readdir(CurrentFolder, (err, files) => {
    files.forEach(file => {
        // only modify files that contain 'page' and end in .html
        if (file.includes('.html')) {
            if (file.includes('page')) {
                console.log(file + ' includes html');
                fs.readFile(file, 'utf8', function (err, contents) {
                    if (err) console.log('ERROR: ' + err);
                    // only modify files that contain a '.page-title-lvl-cover' heading
                    if (contents.includes('page-title-lvl-cover')) {
                        var x = contents;
                        // console.log(x);
                        const $ = cheerio.load(contents)
                        // Extract page title (found within page-title-lvl-cover class)
                        const result = $('.page-title-lvl-cover').text()



                        database[file] = result;

                        console.log(database);

                        console.log(result)


                    }
                });
            }
        }
    });
});
console.log('Last ' + database)

Answer 1

Just make everything synchronize, including readdir and readFile .

// Load node.js filesystem module
var fs = require('fs');
// Load cheerio module for HTML scraping
const cheerio = require('cheerio');
// Load find and replace module
const replace = require('replace-in-file');
// Make for loop that cycles through all files in folder
var stream = fs.createWriteStream("my_file.txt");

var database = {};

const CurrentFolder = './';
const files = fs.readdirSync(CurrentFolder);
files.forEach(file => {
    // only modify files that contain 'page' and end in .html
    if (file.includes('.html')) {
        if (file.includes('page')) {
            console.log(file + ' includes html');
            const contents = fs.readFileSync(file, 'utf8');
            // only modify files that contain a '.page-title-lvl-cover' heading
            if (contents.includes('page-title-lvl-cover')) {
                var x = contents;
                // console.log(x);
                const $ = cheerio.load(contents)
                // Extract page title (found within page-title-lvl-cover class)
                const result = $('.page-title-lvl-cover').text()
                database[file] = result;
                console.log(database);
                console.log(result)
            }
        }
    }
});
console.log('Last ' + database)