Node.js中使用回调函数获取用户输入报错求助

我参考了Node.js中使用回调函数获取用户输入的相关教程，尝试将两段代码合并后运行，控制台抛出错误。预期能输出类似hello *的内容，但不知如何解决，特此求助。

我尝试的代码 #

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

let greetings = (name) => {
    window.alert(`hello ${name}`);
}

let processUserInput = (callback) => {
    readline.question("Who are you? ", input => {
        callback(input);
        readline.close();
    });
}

processUserInput(greetings);

参考的两段代码 #

第一段：

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

readline.question('Who are you?', name => {
  console.log(`Hey there ${name}!`);
  readline.close();
});

第二段：

function greeting(name) {
  alert(`Hello, ${name}`);
}

function processUserInput(callback) {
  const name = prompt("Please enter your name.");
  callback(name);
}

processUserInput(greeting);

控制台报错信息 #

node:internal/readline/emitKeypressEvents:74
            throw err;
            ^

ReferenceError: window is not defined
    at greetings (/Users/*/Documents/vscode/09/temp.js:7:5)
    at /Users/*/Documents/vscode/09/temp.js:12:9
    at [_onLine] [as _onLine] (node:internal/readline/interface:421:7)
    at [_line] [as _line] (node:internal/readline/interface:894:18)
    at [_ttyWrite] [as _ttyWrite] (node:internal/readline/interface:1272:22)
    at ReadStream.onkeypress (node:internal/readline/interface:271:20)
    at ReadStream.emit (node:events:512:28)
    at emitKeys (node:internal/readline/utils:357:14)
    at emitKeys.next (<anonymous>)
    at ReadStream.onData (node:internal/readline/emitKeypressEvents:64:36)

问题原因及解决方法 #

错误原因很明确：window是浏览器环境特有的全局对象，Node.js运行环境中不存在window对象，所以调用window.alert会抛出ReferenceError。

你参考的第二段代码是浏览器环境下的写法（用alert和prompt），而第一段是Node.js环境的写法（用readline和console.log），合并时混淆了两个环境的API。

修正方法：将window.alert替换为Node.js中用于控制台输出的console.log，修改后的代码如下：

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

let greetings = (name) => {
    console.log(`hello ${name}`); // 替换window.alert为console.log
}

let processUserInput = (callback) => {
    readline.question("Who are you? ", input => {
        callback(input);
        readline.close();
    });
}

processUserInput(greetings);

运行这段代码后，输入名字就能得到预期的hello [你的名字]输出。

内容的提问来源于stack exchange，提问作者Mccranky83