承诺链中的未定义读取

Question

我有一个简单的员工资料生成器应用程序。在 generatePage(employeeData) 的承诺之前，一切都按预期工作。控制台正确记录了 employeeData，但未将其传递给 generatePage。有谁知道为什么？我还附上了 generate-page.js 的起始代码图片和“未定义”控制台错误消息。

const {writeFile, copyFile} = require('./utils/generate-site.js');
const generatePage = require('./src/page-template.js');
const mockData = [
    {
       // lots of mock data objects here 
    },
]
let employeeData = mockData;

function init() {
    return inquirer.prompt(questions.startQuestions);
}
function getEmployeeData(answers) {
    if (answers.role === 'Engineer') {
        let engineer = new Engineer (
            answers.name,
            answers.id,
            answers.email,
            answers.role
        )
        return getEngineerData(engineer);
    } else if (answers.role === 'Intern') {
        let intern = new Intern (
            answers.name,
            answers.id,
            answers.email,
            answers.role
        )
        return getInternData(intern)
    } else if (answers.role === 'Manager') {
        let manager = new Manager (
            answers.name,
            answers.id,
            answers.email,
            answers.role
        )
        return getManagerData(manager)
    } 
}

function getEngineerData(engineer) {
        return new Promise((resolve) => {
            resolve (
            inquirer.prompt(questions.engineerQuestions)
            .then ((response) => {
                    engineer = {...engineer, ...response};
                    // console.log(engineer)
                    employeeData.push(engineer)
                }
            )
        )
    })
}
function getInternData(intern) {
        return new Promise((resolve) => {
        // same as getEngineerData function
    })
}
function getManagerData(manager) {
       return new Promise((resolve) => {
        // same as getEngineerData function
    })
}
function confirm() {
    return inquirer.prompt(questions.confirmQuestion)
}

function buildTeam() {
    init()
    .then(answers => getEmployeeData(answers))
    .then(confirm)
    .then(response => response.confirmAdd ? buildTeam() : console.log(employeeData))
    .then(employeeData => generatePage(employeeData))
    .then(pageHTML => {
        return writeFile(pageHTML)
    })
    .then (writeFileResponse => {
        console.log(writeFileResponse);
        return copyFile()
    })
    .then(copyFileResponse => {
        console.log(copyFileResponse);
    })
    .catch (err => {
        console.log(err);
    });
}
buildTeam();

Answer 1

console.log returns "undefined" 所以解决方案是 return 传递承诺链中的 employeeData 数组。

 .then(response => {
        if (response.confirmAdd) {
            buildTeam()
            return employeeData
        } else {
            return employeeData
        }
    })

承诺链中的未定义读取

Undefined reading in promise chain

javascript

node.js

es6-promise