const readline = require("readline-sync");
//老师登录数据库
let teacher = [{ id: 1, name: "yhr", password: "123" }]
// 学生信息库
let information = [
{ id: 1, name: "123", age: "20", gender: "male", score: "98" },
{ id: 2, name: "456", age: "22", gender: "female", score: "80" },
{ id: 3, name: "789", age: "20", gender: "female", score: "75" }
];
//登陆
function login(demo) {
let error = 3;
while (true) {
console.log("请输入账号名：");
let user = readline.question();
console.log("请输入密码：");
let pswd = readline.question();
for (let i = 0; i < demo.length; i++) { //遍历数组
if (demo[i].name == user && demo[i].password == pswd) { // 判断用户输入的用户名和密码 是否正确
console.log("登录成功");
operation();
return;
}
}
console.log("登录失败");
error--;
if (error == 0) {
console.log("你连续输入错误三次，这怕不是你的号哟。记清楚再来哟");
return;
} else {
console.log("你还有" + error + "次机会");
}
}
}
//注册
function register(demo) {
let error = 3; // 判断用户输入错误次数
while (true) {
let state = true; // 状态值
if (error == 0) {
console.log("想好再来吧！！");
return;
}
console.log("请输入用户名：");
let username = readline.question();
for (let i = 0; i < demo.length; i++) {
if (demo[i].name == username) {
console.log("该用户名已经存在");
error--;
state = false;
}
}
if (state) {
console.log("请输入密码：");
let name = readline.question();
console.log("请确认密码：");
let pswd = readline.question();
if (name === pswd) {
console.log("注册成功,正在跳转登录页面....");
demo.push({ name: username, password: pswd });
login(teacher);
return;
} else {
console.log("两次密码不正确，请重新注册");
}
}
}
}
// 查询方式
function query() {
console.log("请选择查询方式： 1.查询所有 2.分类查询");
let choose = readline.question() - 0;
switch (choose) {
case 1: {
console.log("查询结果如下：");
for (let item of information) {
console.log(item);
}
break;
}
case 2:
option();
break;
}
}
// 查询类型
function option() {
console.log("请选择查询类型：1.姓名 2.年龄 3.性别 4.成绩")
let choose = readline.question() - 0;
switch (choose) {
case 1: {
console.log("请输入查询的姓名:")
let inputName = readline.question();
for (let i = 0; i < information.length; i++) {
if (information[i].name == inputName) {
console.log("查询结果，信息如下");
console.log(information[i]);
}
}
break;
}
case 2: {
console.log("请输入查询的年龄:")
let inputAge = readline.question();
console.log("查询结果，信息如下");
for (let i = 0; i < information.length; i++) {
if (information[i].age == inputAge) {
console.log(information[i]);
}
}
break;
}
case 3: {
console.log("请输入查询的性别:")
let inputGender = readline.question();
for (let i = 0; i < information.length; i++) {
if (information[i].gender == inputGender) {
console.log("查询结果，信息如下");
console.log(information[i]);
}
}
break;
}
case 4: {
console.log("请输入查询的成绩:")
let inputScore = readline.question();
for (let i = 0; i < information.length; i++) {
if (information[i].score == inputScore) {
console.log("查询结果，信息如下");
console.log(information[i]);
}
}
break;
}
}
}
// 新增学生信息
function newStudentInformation() {
let number = 0;
for (let i = 0; i < information.length; i++) { //遍历数组
if (i == information.length - 1) {
number = information[i].id + 1; // 如果是数组的最后一项，那么就在最后一项的 id+1
console.log(number);
}
}
console.log("请输入新增学生新增姓名：");
let studentName = readline.question();
console.log("请输入新增学生年龄：");
let studentAge = readline.question();
console.log("请输入新增学生性别");
let studentGender = readline.question();
console.log("请输入新增学生成绩");
let studentScore = readline.question();
let NewStudent = { id: number, name: studentName, age: studentAge, gender: studentGender, score: studentScore };
information.push(NewStudent);
console.log("新增成功，该学生信息如下：");
console.log(NewStudent);
}
// 修改学生信息
function revise() {
while (true) {
console.log("请输入要修改的学生学号：");
let studentId = readline.question();
for (let i = 0; i < information.length; i++) {
if (information[i].id == studentId) {
console.log("该学生信息如下：");
console.log(information[i]);
console.log("请选择要修改的信息: 1.姓名 2.年龄 3.性别 4.成绩");
let choose = readline.question() - 0;
switch (choose) {
case 1: {
console.log("请输入新的名字：")
let newName = readline.question();
information[i].name = newName;
console.log(information[i]);
break;
}
case 2: {
console.log("请输入新的年龄：")
let newAge = readline.question();
information[i].age = newAge;
console.log(information[i]);
break;
}
case 3: {
console.log("请输入新的性别：")
let newGender = readline.question();
information[i].gender = newGender;
console.log(information[i]);
break;
}
case 4: {
console.log("请输入新的成绩：")
let newScore = readline.question();
information[i].score = newScore;
console.log(information[i]);
break;
}
}
return;
}
}
console.log("没有找到该学号的学生，请核对后再输入");
}
}
// 删除学生信息
function deleteInformation() {
console.log("请输入你要删除学生的学号：");
let number = readline.question();
console.log("确定是否删除？ 确定请输入1，取消删除请输入0");
let chooes = readline.question() - 0;
switch (chooes) {
case 1: {
for (let i = 0; i < information.length; i++) {
if (information[i].id == number) {
delete information[i];
console.log("删除成功！");
}
}
break;
}
case 2: return;
}
}
// 选择操作
function operation() {
while (true) {
console.log("请选择操作方式： 1.查询 2.新增 3.修改 4.删除 5.退出");
let userOperation = readline.question() - 0;
switch (userOperation) {
case 1:
query();
break;
case 2:
newStudentInformation();
break;
case 3:
revise();
break;
case 4:
deleteInformation();
break;
case 5:
console.log("欢迎下次使用，再见！");
return;
}
}
}
// 主流程
function menu() {
console.log("请选择业务：1. 登录 2.注册 3.退出");
let userChoose = readline.question() - 0;
switch (userChoose) {
case 1:
login(teacher);
break;
case 2:
register(teacher);
break;
case 3:
console.log("欢迎下次使用！！");
return;
}
}
menu();