javascript - NodeJS "readline"模块不输出提示

Question

使用 NodeJS，我只是为了好玩而尝试制作一个“笔记”管理器，但是当我尝试使用 readline.question() 来获取用户关于他们想做什么的输入(即创建一个新笔记， delete a note)，则不会显示提示。关于如何解决此问题的任何建议？

Link To Project

`

    fileDatabase = [];
    var reply;
    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){ 
            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.", function(answer) {
                var reply = answer
                console.log(reply)
                rl.close();
            });

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

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

`

Answer 1

因为您只使用在线编辑器。 (至少我在努力解决你提示issue的问题。)

我会建议 https://www.katacoda.com/courses/nodejs/playground

将您的代码复制到 app.js 文件中。

您将看到Terminal 选项卡。请先安装依赖。

npm install -g asynch

npm install -g readline

这样，您将在树下拥有 node_modules 文件夹。

然后单击左侧以黑色突出显示的 node app.js 链接。

您应该注意您的代码的几件事:

1. 请尝试为 reply 分配一些默认值，也许你可以像 var reply = 0
2. 如果 reply = 0，则将列表代码包装到条件中。
3. if (reply === "1") 这个条件会严格检查字符串。改用 if(reply == 1)。
4. 并根据您的要求修改您的代码以进入下一题。

修改后的代码如下:

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);
    }
);

供您引用: