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js实现简单的ATM机

2026-03-01 22:41:48JavaScript

实现简单ATM机的核心功能

使用JavaScript实现ATM机需要模拟存款、取款、查询余额和转账等基本功能。以下是一个基于控制台的简单实现方案。

初始化账户数据

创建账户对象存储用户信息和余额：

const accounts = [
  { id: '123456', pin: '1234', balance: 1000 },
  { id: '654321', pin: '4321', balance: 2000 }
];
let currentAccount = null;

登录验证功能

实现PIN码验证逻辑：

function login(accountId, pin) {
  const account = accounts.find(acc => acc.id === accountId && acc.pin === pin);
  if (account) {
    currentAccount = account;
    return true;
  }
  return false;
}

存款功能

增加账户余额的实现：

js实现简单的ATM机

function deposit(amount) {
  if (amount > 0) {
    currentAccount.balance += amount;
    return currentAccount.balance;
  }
  throw new Error('存款金额必须大于零');
}

取款功能

处理余额检查的取款逻辑：

function withdraw(amount) {
  if (amount <= 0) throw new Error('取款金额必须大于零');
  if (amount > currentAccount.balance) throw new Error('余额不足');

  currentAccount.balance -= amount;
  return currentAccount.balance;
}

查询余额

直接返回当前余额：

js实现简单的ATM机

function checkBalance() {
  return currentAccount.balance;
}

转账功能

实现账户间资金转移：

function transfer(targetAccountId, amount) {
  if (amount <= 0) throw new Error('转账金额必须大于零');
  if (amount > currentAccount.balance) throw new Error('余额不足');

  const targetAccount = accounts.find(acc => acc.id === targetAccountId);
  if (!targetAccount) throw new Error('目标账户不存在');

  currentAccount.balance -= amount;
  targetAccount.balance += amount;
  return currentAccount.balance;
}

用户界面交互

简单的控制台交互示例：

function startATM() {
  const readline = require('readline-sync');

  const accountId = readline.question('请输入账户ID: ');
  const pin = readline.question('请输入PIN码: ');

  if (!login(accountId, pin)) {
    console.log('登录失败');
    return;
  }

  while (true) {
    console.log('\n1. 查询余额\n2. 存款\n3. 取款\n4. 转账\n5. 退出');
    const choice = readline.question('请选择操作: ');

    switch (choice) {
      case '1':
        console.log(`当前余额: ${checkBalance()}`);
        break;
      case '2':
        const depositAmount = parseFloat(readline.question('输入存款金额: '));
        console.log(`新余额: ${deposit(depositAmount)}`);
        break;
      case '3':
        const withdrawAmount = parseFloat(readline.question('输入取款金额: '));
        console.log(`新余额: ${withdraw(withdrawAmount)}`);
        break;
      case '4':
        const targetId = readline.question('输入目标账户ID: ');
        const transferAmount = parseFloat(readline.question('输入转账金额: '));
        console.log(`新余额: ${transfer(targetId, transferAmount)}`);
        break;
      case '5':
        currentAccount = null;
        return;
      default:
        console.log('无效选择');
    }
  }
}