等待代码执行以进行输入

let initialArray = [];

let Arr1=[];
let Arr2=[];
let arrayFiles=[];

let outputData = [];

document.getElementById('importExcel').addEventListener('change', handleFile, false);

function handleFile(e) {
    //get initial Array an fill it with Data
    let q = new Promise(function (resolve, reject) {
        for (let x of initialArray) {
            //extract Data for Arr1 and push it there
            //extract Data for Arr2 and push it there
        }
        resolve();
    }
    q.then(workOnArr1).then(getFiles).then(workOnArr1and2).then(mergeData).catch(console.log.bind(console));
}
function workOnArr1() {
    //rearranging and adding Data to Arr1
}
function getFiles() {
    if (document.getElementById("getFileData").checked) {
        dialog.showOpenDialog({properties: ['openDirectory']}, function (filePaths) {
            //here it should stop until a directory is chosen and the filenames
            // are read into arrayFiles
            fs.readdirSync(filePaths[0]).forEach(file => {
                arrayFiles.push(file)
            });
        });
    }
}
function workOnArr1and2() {
    //alter Arr1 and integrate the Data of arrayFiles into it
    for (let x of Arr1) {
        //that does not work, because the script does not stop at the dialog,
        //arrayFiles is always empty when this line is executed
        for (let y of arrayFiles) 
            if (somecondition) {
                x.subArray = y
            }
    }
    //alter and reshape Arr2
}
function mergeData() {
    outputData = _.concat(Arr1,Arr2);
    //write outputData to DB
} 

then Promise 在执行下一个函数之前,等待一个函数完成。但似乎我遗漏了一些关键点,或者我的假设完全错误。