两种atm取款方式

1.//函数   密码   账号
function User(username, password, account){
   this.username = username;
   this.password = password;
   this.account = account;
}
//用户.原型.获得钱=运行（钱）
User.prototype.getMoney = function(money){
   this.account -= ~~money;//这账单
   alert(`取款金额为${money}，当前账户余额为${this.account}`);
}

User.prototype.saveMoney = function(money){
   this.account += ~~money;
   alert(`存款金额为${money}，当前账户余额为${this.account}`);
}

User.prototype.query = function(){
   alert(`当前账户余额为${this.account}`);
}
2.

function Atm(){
   this.userList = [];
}

Atm.prototype.start = function(){
   this.createUser();
   this.login();
}

Atm.prototype.createUser = function(){
   for(let i = 0; i < 3; i++){
      let user = new User(`zhangsan${i}`, `${i}`, i * 1000);
      this.userList.push(user);
   }
}

Atm.prototype.login = function(){
   let username = prompt("请输入用户名");
   let password = prompt("请输入密码");

   for(let i = 0; i < this.userList.length; i++){
      if(username === this.userList[i].username && password === this.userList[i].password){
         alert("登录成功");
         this.operate(this.userList[i]);
         return;
      } 
   }
   alert("登录失败");
}

Atm.prototype.operate = function(curUser){
   let flag = true;
   do{
      let option = ~~prompt("请选择业务：1.存款 2.取款 3.查询 4.退出");
      switch(option){
         case 1:
            let save = prompt("请输入存款金额");
            curUser.saveMoney(save);
            break;
         case 2:
            let get = prompt("请输入取款金额");
            curUser.getMoney(get);
            break;
         case 3:
            curUser.query();
            break;
         default:
            alert("谢谢使用，再见！");
            flag = false;
      }
   }while(flag)
}

new Atm().start();