多用户ATM机(面向对象编程)
let readline = require('readline-sync');
// 清屏函数
let clear = () => process.stdout.write(process.platform === 'win32' ? '\x1Bc' : '\x1B[2J\x1B[3J\x1B[H');
class Person {
constructor(userID, userName, userPwd) {
this.id = userID;
this.name = userName;
this.pwd = userPwd;
}
}
class ATM {
constructor() {
this.arr = [];
}
// 注册
signAccount(Person) {
let isflag = true;
for (let i of this.arr) {
if (i.id == Person.id) {
isflag = false;
break;
}
}
if (isflag) {
this.arr.push({ id: Person.id, name: Person.name, pwd: Person.pwd, totalMoney: 0 });
return true;
} else {
return false;
}
}
// 登录
loadAccount(userID, userPwd) {
let isflag = '';
for (let i of this.arr) {
if (i.id == userID && i.pwd == userPwd) {
isflag = i.name;
}
}
return isflag;
}
// 查询
searchMoneyFunc(userID) {
for (let i of this.arr) {
if (i.id == userID) {
return i.totalMoney;
}
}
}
// 取钱
outMoneyFunc(userID, outMoney) {
if (outMoney < 0) {
return `非法金额!`;
}
for (let i of this.arr) {
if (i.id == userID) {
if (i.totalMoney < outMoney) {
return `余额不足!`;
} else {
i.totalMoney -= outMoney;
return `钱已取出，当前余额为：${i.totalMoney}`;
}
}
}
}
// 存钱
saveMoneyFunc(userID, saveMoney) {
if (saveMoney < 0) {
return `非法金额`;
}
for (let i of this.arr) {
if (i.id == userID) {
i.totalMoney += saveMoney;
return `钱已存入，当前余额为：${i.totalMoney}`;
}
}
}
// 转账
transferMoneyFunc(userID, transferID, transferMoney) {
if (transferMoney < 0) {
return `非法金额`;
}
let userMoney = this.searchMoneyFunc(userID);
if (userMoney < transferMoney) {
return `余额不足！`;
}
let isflag = false;
for (let i of this.arr) {
if (i.id == transferID) {
isflag = true;
i.totalMoney += transferMoney;
break;
}
}
if (isflag) {
for (let i of this.arr) {
if (i.id == userID) {
i.totalMoney -= transferMoney;
return `转账成功，当前余额为${i.totalMoney}`;
}
}
} else {
return `没有此用户！`;
}
}
}
let atm = new ATM();
let action = true;
while (action) {
clear();
console.log('请输入您要进行的操作:1.用户登录 2.用户注册 0.退出');
let choose = ~~readline.question('');
switch (choose) {
// 用户登录
case 1: {
console.log('请输入您的账户：');
let account = readline.question('');
console.log('请输入您的密码：');
let password = ~~readline.question('');
let login = atm.loadAccount(account, password); // 登录
if (login != '') {
console.log(`欢迎您！${login}`);
let act = true;
while (act) {
clear();
console.log('请输入您要操作的程序：1、查询 2、取款 3、存款 4、转账 0、退出');
let chooseNum = ~~readline.question('');
switch (chooseNum) {
// 查询
case 1: {
let totalMoney = atm.searchMoneyFunc(account);
console.log(`当前余额为：${totalMoney}`);
console.log('按回车键继续~~');
readline.question('');
break;
}
// 取款
case 2: {
console.log('请输入您的取款金额：');
let outMoney = ~~readline.question('');
console.log(atm.outMoneyFunc(account, outMoney));
console.log('按回车键继续~~');
readline.question('');
break;
}
// 存款
case 3: {
console.log('请输入您的存款金额：');
let saveMoney = ~~readline.question('');
console.log(atm.saveMoneyFunc(account, saveMoney));
console.log('按回车键继续~~');
readline.question('');
break;
}
// 转账
case 4: {
console.log('请输入您要转入的账户ID：');
let transferID = readline.question('');
console.log('请输入您的转款金额：')
let transferMoney = ~~readline.question('');
console.log(atm.transferMoneyFunc(account, transferID, transferMoney));
console.log('按回车键继续~~');
readline.question('');
break;
}
// 退出
case 0: {
act = false;
break;
}
// 输入有误
default:
console.log('您的操作不符合规范');
console.log('按回车键继续~~');
readline.question('');
break;
}
}
} else {
console.log(`账户或密码错误!按回车键继续~~`);
readline.question('');
}
break;
}
// 用户注册
case 2: {
console.log('请输入您的姓名：');
let userName = readline.question('');
console.log('请输入您的ID：');
let userID = readline.question('');
console.log('请输入您的密码：');
let userPwd = readline.question('');
let person = new Person(userID, userName, userPwd);
let account = atm.signAccount(person);
if (account) {
console.log('账户创建成功!');
console.log('按回车键继续~~');
readline.question('');
// console.log(atm.arr);
} else {
console.log('该账户已被人抢先注册啦，账户创建失败了呢！');
console.log('按回车键继续~~');
readline.question('');
}
break;
}
// 退出
case 0: {
console.log('系统已退出，感谢使用！');
action = false;
break;
}
// 输入错误
default: {
console.log('输入有误!');
console.log('按回车键继续~~');
readline.question('');
break;
}
}
}
在多用户ATM机这个案例中，功能比较复杂的算是转账了。用面向对象编程思想来写，思路是比较清晰的。本案例用了ES6的class类来实现。
