学生信息统计表

const readline = require('readline-sync');
let maxLength = 5;
//帐号库
let accountName = () => {
    let account = [{ name: '123', password: 456 },
    { name: 'lisi', password: 123 },
    { name: 'wangwu', password: 123 }]
    return account;
}
//信息库
let dateBase = () => {
    let date = [
        { id: 1, name: 'zhang', age: '18', gender: 'man', score: '98' },
        { id: 2, name: 'liu', age: '19', gender: 'woman', score: '78' },
        { id: 3, name: 'wang', age: '20', gender: 'woman', score: '65' },
        { id: 4, name: 'wang', age: '20', gender: 'woman', score: '65' },
        { id: 5, name: 'yang', age: '22', gender: 'man', score: '100' }
    ];
    return date;
}
//数据格式化
let dateFrom = (arr) => {
    console.log('学号 \t 姓名\t 年龄\t 性别\t 成绩\t ')
    for (let item of arr) {
        let { id, name, age, gender, score } = item;
        console.log(id + '\t', name + '\t', age + '\t', gender + '\t', score + '\t')
    }
}
// 登录
let login = (account) => {
    let error = 3
    while (true) {
        console.log('请输入帐号：')
        let uesrname = readline.question();
        console.log('请输入密码：')
        let password = readline.question();
        for (i = 0; i < account.length; i++) {
            if (uesrname == account[i].name && password == account[i].password) {
                console.log('登录成功');
                operation();
                return true;
            }
        }
        error--;
        if (error == 0) {
            console.log('输入次数过多，退出程序')
            return true;
        }
        console.log('登陆错误，还有' + error + '次机会，请从新输入')
    }
}
//注册
let register = (account) => {
    while (true) {
        console.log('请输入注册帐号：')
        let username = readline.question();
        let flag = false;
        for (let i = 0; i < account.length; i++) {
            if (account[i].name === username) {
                console.log('帐号已被占用，请从新注册~')
                flag = true;
            }
        }
        if (flag) {
            continue;
        }
        console.log('请输入注册密码：')
        let getpassword = readline.question();
        let table = {
            name: username,
            password: getpassword
        }
        account.push(table);
        console.log(`恭喜你，注册成功！帐号为${username},密码为${getpassword}。即将跳转登陆页面...`)
        login(account);
        break;
    }
}
//分类查询
let classQuery = (key, date) => {
    console.log('请输入查询信息：')
    let queryDate = readline.question();
    let reg = new RegExp(queryDate);
    let arr = [];
    let i =0;
    for (let item of date) {
        if (item[key].search(reg) != -1) {
            arr.push(item)
            i++;
        }
    }
    if(i==0)
    {
        console.log('无此信息')
        return;
    }
    dateFrom(arr);
}
//查询
let query = (date) => {
    console.log('请选择查询方式： 1.查询全部 2.分类查询');
    let option = readline.question() - 0;
    switch (option) {
        case 1:
            dateFrom(date);
            break;
        case 2: {
            console.log('请选择查询: 1.姓名 2.年龄 3.性别 4.成绩')
            let queryOption = readline.question() - 0;
            switch (queryOption) {
                case 1: classQuery('name', date); break;
                case 2: classQuery('age', date); break;
                case 3: classQuery('gender', date); break;
                case 4: classQuery('score', date); break;
                default:console.log('选择有误，返回主菜单~');break;
            }break;
        }
    }
}
//新增
let increre = (date) => {
    console.log('请输入要新增学生的姓名：')
    let name = readline.question();
    console.log('请输入要新增学生的年龄：')
    let age = readline.question();
    console.log('请输入要新增学生的性别：')
    let gender = readline.question();
    console.log('请输入要新增学生的成绩：')
    let score = readline.question();
    date.push({ id: ++maxLength, name, age, gender, score })
    console.log(maxLength);
    console.log('新增成功!该学生信息以下：');
    let arr = [];
    arr.push(date[date.length - 1]);
    dateFrom(arr);
}
//分类修改数据
let classModify = (date, i, key) => {
    console.log('请输入新的数据');
    let newDate = readline.question();
    date[i][key] = newDate;
    console.log('修改为功!该学生信息以下：');
    let arr = [];
    arr.push(date[i]);
    dateFrom(arr);
    return;
}
//修改
let modify = (date) => {
    while (true) {
        console.log('请输入要修改学生的学号：')
        let id = readline.question();
        for (let i = 0; i < date.length; i++) {
            if (date[i].id == id) {
                console.log('当前学生信息以下：')
                let arr = [];
                arr.push(date[i]);
                dateFrom(arr);
                console.log('请选择要修改的信息  1.姓名 2.年龄 3.性别 4.成绩 5.返回 ')
                let option = readline.question() - 0;
                switch (option) {
                    case 1: classModify(date, i, 'name'); break;
                    case 2: classModify(date, i, 'age'); break;
                    case 3: classModify(date, i, 'gender'); break;
                    case 4: classModify(date, i, 'score'); break;
                    case 5: return;
                }
                return;
            }
        }
        console.log('无此学生信息,请从新输入')
    }
}
//删除
let deletedate = (date) => {
    while (true) {
        console.log('请输入要删除的学号：')
        let id = readline.question();
        for (let i = 0; i < date.length; i++) {
            if (date[i].id == id) {
                console.log('当前学生信息以下：')
                let arr = [];
                arr.push(date[i]);
                dateFrom(arr);
                console.log('确认删除：1.是 2.否')
                let num = readline.question();
                if (num == 1) {
                    date.splice(i, 1)
                    console.log('删除成功！')
                    return;
                }
                if (num == 2) {
                    return;
                }
            }
        }
        console.log('无此学生信息,请从新输入')
    }
}
//操做选项
let operation = () => {
    let date = dateBase();
    while (true) {
        console.log('请选择操做 1.查询 2.新增 3.修改 4.删除 5.退出 ')
        let option = readline.question() - 0;
        switch (option) {
            case 1: query(date); break;
            case 2: increre(date); break;
            case 3: modify(date); break;
            case 4: deletedate(date); break;
            case 5: return false;
        }
    }
}
//主页
let main = () => {
    let account = accountName();
    while (true) {
        console.log('请选择 1.登录  2.注册  3.退出')
        let num = readline.question() - 0;
        switch (num) {
            case 1:
                let flag = false;
                flag = login(account);
                if (flag) {
                    return;
                }
                break;
            case 2:
                register(account);
                break;
            case 3:
                console.log('谢谢使用！');
                return;
        }
    }
}

main();