使用流程控制语句写 ATM

使用流程控制语句写   ATM    

let username = "z",
   password = "1",
   account = 10000,
   isLogin = false;

while (!isLogin) {
   let usernameInput = window.prompt("请输入用户名:");
   let passwordInput = window.prompt("请输入密码:");

   console.log(usernameInput, passwordInput)

   if (usernameInput === username && password === passwordInput) {
      let flag = true;
      while (flag) {
         let option = ~~window.prompt("选择操作类型: 1. 查询 2. 存款 3. 取款 4. 修改密码 5. 退出 6. 退出登录");
         switch (option) {
            case 1:
               console.log("你的余额为: " + account);
               break;
            case 2:
               {
                  let money = ~~window.prompt("输入存款金额: ");
                  account += money;
               }
               break;
            case 3:
               {
                  let money = ~~window.prompt("输入取款金额: ");
                  account -= money;
               }
               break;
            case 4:
               password = window.prompt("输入新密码: ");
               break;
            case 5:
               flag = false;
               console.log("退出");
               break;
            case 6:
               flag = false;
               isLogin = true;
         }
      }
   }
}