nodejs implements entering password three times

Node.js is a JavaScript runtime environment widely used on the server side. It can implement an efficient event-driven, non-blocking I/O model while supporting large-scale concurrent operations. This article will introduce how to use Node.js to implement a function that allows you to enter a password three times.

Before implementing this function, we need to first understand the two modules in Node.js: readline and console.

The readline module is one of the standard modules of Node.js. It provides an interface for reading the command line input stream. Through the readline module, we can listen to command line input events and respond to input events.

The console module is a built-in module of Node.js. It provides an interface for printing characters to the standard output stream.

Next, we can start to enter the password three times. The specific implementation steps are as follows:

1. Introduce the readline module and create a readline.Interface object.

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

2. Use the console module to prompt the user to enter a password, and use the readline module to listen for command line input events.

const password = '123456'; // 设置正确的密码
let count = 0; // 用于记录用户重试次数
rl.question('请输入您的密码：', (input) => {
    if(input === password){
        console.log('密码正确！');
        rl.close(); // 关闭 readline.Interface 对象
    }else{
        if(count >= 2){
            console.log('重试次数已达上限！');
            rl.close();
        }else{
            console.log('密码错误，请重新输入！');
            count++;
        }
    }
});

3. Determine whether the password entered by the user is correct. If it is correct, directly close the readline.Interface object; otherwise, prompt the user according to the number of retries. If the number of retries has reached the upper limit, directly Close the readline.Interface object.

Through the above code, we can implement a simple function of entering the password three times. The complete code is as follows:

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

const password = '123456'; // 设置正确的密码
let count = 0; // 用于记录用户重试次数

rl.question('请输入您的密码：', (input) => {
    if(input === password){
        console.log('密码正确！');
        rl.close(); // 关闭 readline.Interface 对象
    }else{
        if(count >= 2){
            console.log('重试次数已达上限！');
            rl.close();
        }else{
            console.log('密码错误，请重新输入！');
            count++;
        }
    }
});

Summary

This article introduces how to use Node.js to implement a function that allows you to enter a password three times. Through the two modules readline and console, we can quickly implement a simple command line interactive program. For Node.js developers, this is a very useful tool that can be used to achieve more similar functions.

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