秒客网

const readline = require(\'readline-sync\')//引用readline-sync
//用户名，密码
let user = [{
    username: \'yang\',
    password: 123
}, {
    username: \'kai\',
    password: 456
}, {
    username: \'ming\',
    password: 789
}
];
// 注册
let fn2 = function () {
    console.log(\'请输入注册用户名：\');
    let username1 = readline.question();
    console.log(\'请输入注册密码：\');
    let password1 = readline.question() - 0;
    let obj = {};//创建对象
    obj.username = username1;
    obj.password = password1;
    user.push(obj);//添加数据
    console.log(\'注册成功，跳转登陆页面。。。。\')
    add();
    // liuchen();
    //调用登录
}
//登陆
let add = function () {
    let s = 2;//错误的次数
    while (true) {
        console.log(\'请输入用户名：\');
        let username = readline.question();
        console.log(\'请输入密码：\');
        let password = readline.question() - 0;
        for (let i = 0; i < user.length; i++) {
            if (username == user[i].username && password == user[i].password) {//判断输的值与初始值是否相等
                console.log(\'欢迎你，登陆成功\');
                liuchen();//调用登陆后的主流程
                return;
            }
        }
        //输入不正确，超过三次
        if (s != 0) {
            console.log(`密码或账户有误，你还有${s}次机会，请重新输入！`);
            s--;

        } else {
            console.log(\'账户锁定！\');
            break;
        }
    }
}
//登录前主流程
let fn3 = function () {
    console.log(\'请选择以下要求：1.登陆 2.注册 3.退出\');
    let num = readline.question() - 0;//选择要求
    switch (num) {
        case 1:
            add();//调用add
            break;
        case 2:
            fn2();//调用注册
            break;
        case 3:
            console.log(\'欢迎下次光临，再见！\')
            return;//结束
    }
}
//查询所有
let arr = [
    { id: 1, name: \'liu\', age: \'18\', gender: \'nan\', score: \'98\' },
    { id: 2, name: \'li\', age: \'20\', gender: \'nv\', score: \'80\' },
    { id: 3, name: \'zhang\', age: \'20\', gender: \'nv\', score: \'90\' },
    { id: 4, name: \'ma\', age: \'21\', gender: \'nan\', score: \'70\' }
]
console.log(\'学号\t姓名\t年龄\t性别\t成绩\t\');
for (let ai of arr) {//遍历出数组
    let str = \'\';
    for (let key in ai) {//遍历出键名

        str += ai[key] + \'\t\';
    }
    console.log(str);
}
let maxID = 4;//给一个固定的值
//分类查询
let chaxun = function () {
    while (true) {
        console.log(\'请选择查询类型： 1.姓名 2.年龄 3.性别 4.成绩 5.返回\');
        let num3 = readline.question() - 0;
        switch (num3) {
            case 1:
                console.log(\'请输入要查询的名字：\');
                fun(\'name\');
                break;
            case 2:
                console.log(\'请输入要查询的年龄：\');
                fun(\'age\');
                break;
            case 3:
                console.log(\'请输入要查询的性别：\');
                fun(\'gender\');
                break;
            case 4:
                console.log(\'请输入要查询的成绩:\');
                fun(\'score\');
                break;
            case 5:
                return;
        }
    }
}
let fun = function (type) {//type键名为变量要用[]
    let name = readline.question();
    for (let i in arr) {//模糊查找
        if (arr[i][type].search(name) >= 0) {
            console.log(arr[i]);
        }
    }
//第二种方法
    // for (let i = 0; i < arr.length; i++) {//精确查找
    //     if (arr[i][type] == name) {
    //         console.log(arr[i]);
    //     }
    // }
}
//查询
let chaxun1 = function () {
    while (true) {
        console.log(\'请选择查询方式：1.查询所有 2.分类查询\');
        let num2 = readline.question() - 0;
        switch (num2) {
            case 1://查询所有
                for (let a of arr) {//遍历数组
                    console.log(a);
                }
                break;
            case 2://分类查询
                chaxun();
                break;
        }
        break;
    }
}
//新增
let xinzhen = function () {
    while (true) {
        console.log(\'请输入新增学生姓名：\');
        let name = readline.question();
        console.log(\'请输入新增学生的年龄：\');
        let age = readline.question();
        console.log(\'请输入新增学生的性别：\');
        let gender = readline.question();
        console.log(\'请输入新增学生的成绩：\');
        let score = readline.question();
        let arr1 = {};//创建对象
        arr1 = ({ id: ++maxID, name, age, gender, score });
        arr.push(arr1);//添加数据
        console.log(arr1)
        break;
    }
}
//修改
let xiugai = function () {
    while (true) {
        console.log(\'请输入要修改学生的学号：\');
        let id = readline.question() - 0;
        for (let i4 = 0; i4 < arr.length; i4++) {
            if (arr[i4].id == id) {//判断输入的id名
                console.log(\'当前学生信息如下：\');
                console.log(arr[i4])
                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 num4 = readline.question() - 0;
                switch (num4) {
                    case 1:
                        xiugai1(i4, \'name\');
                        break;
                    case 2:
                        xiugai1(i4, \'age\');
                        break;
                    case 3:
                        xiugai1(i4, \'gender\');
                        break;
                    case 4:
                        xiugai1(i4, \'score\');
                        break;
                    case 5:
                        return;
                }
            }
        } break;
    }
}
let xiugai1 = function (i4, xinxi) {//i4.为学生下标的属性，xinxi为要修改的键名(变量用[])
    console.log(\'请输入新的数据：\');
    let name = readline.question();
    arr[i4][xinxi] = name;//输入的信息赋值给键名
    console.log(\'修改成功！该学生信息如下：\');
    console.log(arr[i4]);
}
//删除
let shanchu = function () {
    while (true) {
        console.log(\'请输入要删除学生的学号：\');
        let id1 = readline.question() - 0;
        for (let i5 = 0; i5 < arr.length; i5++) {
            if (arr[i5].id == id1) {//判断输入的id1是否等于对象的键名
                console.log(\'当前学生信息如下：\');
                console.log(arr[i5]);
                console.log(\'确定删除：1.是 2.否\');
                let num5 = readline.question() - 0;
                if (num5 == 1) {
                    console.log(\'删除成功！删除后信息如下：\');
                    arr.splice(i5, 1);//删除数据i为下标，1为删除的个数
                    for (let a of arr) {
                        console.log(a);
                    }
                }

            }
        }
        break;
    }
}
//主控住流程
let liuchen = function () {
    while (true) {
        console.log(\'请选择一下操作：。。1.查询 2.新增 3.修改 4.删除 5.退出\');
        let num1 = readline.question() - 0;
        switch (num1) {
            case 1:
                //查询
                chaxun1();
                
                break;
            case 2:
                // 新增
                xinzhen();
                break;
            case 3:
                //修改
                xiugai();
                break;
            case 4:
                //删除
                shanchu();
                break;
            case 5:
                //退出
                console.log(\'欢迎下次使用，再见！\');
                return;
        }
    }
}
fn3();