javascript - 读取控制台输入的链接 promise

Question

我正在尝试链接一些 promise ，其中一个 promise 从控制台读取输入并将结果传递给下一个 promise 到一个对象中。问题是我在第二个 promise 中未定义，并且 promise 不会链接。

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

const getUrl = (objectInfo) =>{
    return new Promise((resolve) => {
        rl.question('Introduce post URL ', (answerUrl) => {
            console.log(answerUrl);
            rl.close();
            objectInfo.url = answerUrl;
            resolve(objectInfo);
        });
    });
};

const getFieldsToFill = (objectInfo) => {
    new Promise((resolve) => {
        rl.question('Introuce fields with spaces', (answerFields) => {
            console.log(answerFields);
            rl.close();
            objectInfo.answerFields = answerFields;
            resolve(objectInfo);
        });
    }); 
};

const getFieldsType = (objectInfo) => {
    new Promise((resolve) => {
        rl.question('Introduce types ', (answerTypes) => {
            console.log(answerFields);
            rl.close();
            objectInfo.types = answerTypes
            resolve(objectInfo);
        });
    });
} 

getUrl({})
    .then(getFieldsToFill)
    .then(getFieldsType)
    .then((information) => {
        console.log(information)
    });

Answer 1

您的代码中有两个问题:

1. getFieldsToFill 和 getFieldsType 中缺少 return 语句
2. 您在阅读更多答案之前关闭了阅读行

以下是包含这些修复的代码:

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

const getUrl = (objectInfo) =>{
    return new Promise((resolve) => {
        rl.question('Introduce post URL ', (answerUrl) => {
            console.log(answerUrl);
            objectInfo.url = answerUrl;
            resolve(objectInfo);
        });
    });
};

const getFieldsToFill = (objectInfo) => {
    return new Promise((resolve) => {
        rl.question('Introuce fields with spaces', (answerFields) => {
            console.log(answerFields);
            objectInfo.answerFields = answerFields;
            resolve(objectInfo);
        });
    }); 
};

const getFieldsType = (objectInfo) => {
    return new Promise((resolve) => {
        console.log(objectInfo);
        rl.question('Introduce types ', (answerTypes) => {
            rl.close();
            objectInfo.types = answerTypes
            resolve(objectInfo);
        });
    });
}; 

getUrl({})
    .then(getFieldsToFill)
    .then(getFieldsType)
    .then((information) => {
        console.log(information)
    });