Javascript NodeJS“；readline"；模块未输出提示

使用NodeJS，我试图制作一个“note”管理器只是为了好玩，但当我试图使用readline.question（）获取用户对他们想做什么的输入（即创建新便笺、删除便笺）时，不会显示提示。关于如何解决这个问题，有什么建议吗

`

---

`

因为您只使用在线编辑器。（至少我正在努力解决您的提示问题。）

我建议

将代码复制到

app.js

文件中

您将拥有

终端

选项卡。请先安装依赖项

npm安装-g异步

npm安装-g readline

通过它，您将在树下拥有

node\u modules

文件夹

然后点击

node app.js

链接左侧以黑色突出显示

关于代码，您应该注意以下几点：

fileDatabase = [];
var reply = 0;
var FileName;
var FileContent;

var readline = require('readline');
var async = require('async');

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

class NewFile {
    constructor(fileName, fileContent) {
        this.fileName = fileName;
        this.fileContent = fileContent;
    }
}

console.log('Hello! Welcome to your file management system.');

async.whilst(
    function() {
        return reply != '5';
    },

    function(callback) {
 
        if (reply === 0) {
            rl.question(
                'Press a number:\n1: Create a new file.\n2: View a file.\n3: Add to a file.\n4: Delete a file.\n5: Exit this program.\n',
                function(answer) {
                     reply = answer;
                    rl.close();
                }
            );
      }

    if (reply == 1) {
        rl.question('What would you like to name this file?\n', function(answer) {
            var FileName = answer;
            rl.close();
        });
        rl.question(
            'Write onto your file. You will be able to edit it later.\n',
            function(answer) {
                var FileContent = answer;
                rl.close();
            }
        );
    }
    setTimeout(callback, 1000);
},

    function(err) {
        console.err('we encountered an error', err);
    }
);

请尝试为

reply

分配一些默认值，也许您可以按照

var reply=0

如果

reply=0

，则将列表代码包装为条件

if（reply==“1”）

此条件将严格检查字符串。如果（回复==1）使用

并根据您的要求修改您的代码以进入下一个问题

下面是修改代码：

fileDatabase = [];
var reply = 0;
var FileName;
var FileContent;

var readline = require('readline');
var async = require('async');

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

class NewFile {
    constructor(fileName, fileContent) {
        this.fileName = fileName;
        this.fileContent = fileContent;
    }
}

console.log('Hello! Welcome to your file management system.');

async.whilst(
    function() {
        return reply != '5';
    },

    function(callback) {
 
        if (reply === 0) {
            rl.question(
                'Press a number:\n1: Create a new file.\n2: View a file.\n3: Add to a file.\n4: Delete a file.\n5: Exit this program.\n',
                function(answer) {
                     reply = answer;
                    rl.close();
                }
            );
      }

    if (reply == 1) {
        rl.question('What would you like to name this file?\n', function(answer) {
            var FileName = answer;
            rl.close();
        });
        rl.question(
            'Write onto your file. You will be able to edit it later.\n',
            function(answer) {
                var FileContent = answer;
                rl.close();
            }
        );
    }
    setTimeout(callback, 1000);
},

    function(err) {
        console.err('we encountered an error', err);
    }
);

供您参考：

fileDatabase = [];
var reply = 0;
var FileName;
var FileContent;

var readline = require('readline');
var async = require('async');

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

class NewFile {
    constructor(fileName, fileContent) {
        this.fileName = fileName;
        this.fileContent = fileContent;
    }
}

console.log('Hello! Welcome to your file management system.');

async.whilst(
    function() {
        return reply != '5';
    },

    function(callback) {
 
        if (reply === 0) {
            rl.question(
                'Press a number:\n1: Create a new file.\n2: View a file.\n3: Add to a file.\n4: Delete a file.\n5: Exit this program.\n',
                function(answer) {
                     reply = answer;
                    rl.close();
                }
            );
      }

    if (reply == 1) {
        rl.question('What would you like to name this file?\n', function(answer) {
            var FileName = answer;
            rl.close();
        });
        rl.question(
            'Write onto your file. You will be able to edit it later.\n',
            function(answer) {
                var FileContent = answer;
                rl.close();
            }
        );
    }
    setTimeout(callback, 1000);
},

    function(err) {
        console.err('we encountered an error', err);
    }
);

---

您是否能够获得

的列表，请按一个数字：1：创建一个新文件。2：查看文件。3：添加到文件。4：删除一个文件。5：退出此程序。

@HardikShah当我运行程序时，列表不会输出到控制台，如果这是您的意思的话。在我的情况下，列表非常完美，但在选择1作为选项后，什么都没有发生。你能添加NodeJS异步和readline模块版本吗？@HardikShah在我的在线ide（repl.it）上，异步模块是2.6.1版本，但是我认为实际上不支持readline模块，这解释了为什么我没有输出选项列表是

readline

模块不支持repl.it在线ide。你能试试你当地的环境吗？你当地的环境行为是什么？