如何让循环在这个JavaScript赋值中工作？

Question

我的任务是：“本田-丰田汽车保险：

编写一个JavaScript程序，根据以下规则打印保险费以支付车辆费用：

一辆全轮驱动的本田售价450美元。

一辆两轮驱动的本田车售价350美元。

一辆全轮驱动的丰田车售价300美元。

一辆两轮驱动的丰田车售价250美元。

任何其他类型的车辆都会生成错误消息。网页应该提示用户适当的信息:询问汽车型号(本田或丰田)，然后如果它是四轮驱动或不是，然后显示保险费。打印保险费后，程序应询问用户是否要为使用重复结构的其他车辆投保。

我以前没有任何使用循环的经验，并且不知道如何让程序在用户在提示“你想要为另一辆车提供保险吗？”回答“是”时返回到开头。下面是我使用的代码：

​

function feeCalc() //Linked to button on html page. Perhaps this was the issue?
{
    let carType = prompt('Do you have a Honda or Toyota?');


    //changes case of input string to lowercase
    let carTypeLC = carType.toLowerCase();


    //prices of different insurance
    let hondaAWD = "450.00";

    let honda2WD = "350.00";

    let toyotaAWD = "300.00";

    let toyota2WD = "250.00";


    if ((carTypeLC == 'honda') || (carTypeLC == 'toyota')) {
        let wheelDrive = prompt('Does your vehicle have All Wheel Drive or Two Wheel Drive? Enter \"AWD\" or \"2WD\".');


        //changes case of input string to lowercase
        let wheelDriveLC = wheelDrive.toLowerCase();


        if ((carTypeLC == 'honda') && (wheelDriveLC == 'awd')) {
            alert('The insurance fee for your Honda AWD is $' + hondaAWD);

            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Honda AWD is $' + hondaAWD;
        } else if ((carTypeLC == 'honda') && (wheelDriveLC == '2wd')) {
            alert('The insurance fee for your Honda 2WD is $' + honda2WD);

            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Honda 2WD is $' + honda2WD;
        } else if ((carType = 'toyota') && (wheelDrive == 'awd')) {
            alert('The insurance fee for your Toyota AWD is $' + toyotaAWD);

            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Toyota AWD is $' + toyotaAWD;
        } else if ((carType = 'toyota') && (wheelDrive == '2wd')) {
            alert('The insurance fee for your Toyota 2WD is $' + toyota2WD);

            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Toyota 2WD is $' + toyota2WD;
        } else {
            alert('There seems to be an error. Please try again.');
        }
    } else {
        alert('There seems to be an error. Please try again.');
    }

    let restart = prompt('Do you want to insure another vehicle? \"y\" or \"n\"')
}

do {
    feeCalc
} while (restart = 'y' && restart != 'n');
//I commented the above do while loop code out because it was not working and made the rest of my code not function. I had to submit the assignment so I submitted what was working. 

​

这个函数被链接到html页面上的一个按钮上，也许这是我的问题，但我没有时间在最后期限前编辑我刚刚构建的所有代码。我非常确定我需要使用do while循环，但是我就是不能让它工作(所以我把它注释掉了)。我是一个初学者，正在上在线课程，所以我正在尽我所能地利用给我的信息，但不幸的是，教授没有发布任何关于如何用数值以外的任何东西做循环的例子。除了循环部分之外，上面的代码运行得很好。请帮助我，因为我的教授评分非常慢，没有提供具体的反馈。

Answer 1

你已经得到了它的大部分。尝试返回prompt的值，然后将其用作while循环中的标志。就像这样-

function feeCalc()  //Linked to button on html page. Perhaps this was the issue?    
  {
  
  let carType = prompt('Do you have a Honda or Toyota?');

  //changes case of input string to lowercase
  let carTypeLC = carType.toLowerCase();
    //prices of different insurance
  let hondaAWD = "450.00";
  let honda2WD = "350.00";
  let toyotaAWD = "300.00";
  let toyota2WD = "250.00";

  if ((carTypeLC == 'honda') || (carTypeLC == 'toyota'))
    {
        let wheelDrive = prompt('Does your vehicle have All Wheel Drive or Two Wheel Drive? Enter \"AWD\" or \"2WD\".');
        //changes case of input string to lowercase
        let wheelDriveLC = wheelDrive.toLowerCase();
        
        if ((carTypeLC =='honda') && (wheelDriveLC =='awd'))
            {
            alert('The insurance fee for your Honda AWD is $' + hondaAWD);
            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Honda AWD is $' + hondaAWD;
            }
        else if ((carTypeLC == 'honda') && (wheelDriveLC =='2wd'))
            {
            alert('The insurance fee for your Honda 2WD is $' + honda2WD);
            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Honda 2WD is $' + honda2WD;
            }
        else if ((carType=='toyota') && (wheelDrive=='awd'))
            {
            alert('The insurance fee for your Toyota AWD is $' + toyotaAWD);
            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Toyota AWD is $' + toyotaAWD;
            }
        else if ((carType=='toyota') && (wheelDrive=='2wd'))
            {
            alert('The insurance fee for your Toyota 2WD is $' + toyota2WD);
            document.getElementById("webDisplay").innerHTML = 'The insurance fee for your Toyota 2WD is $' + toyota2WD;
            }
        else
            {
            alert('There seems to be an error. Please try again.');
            }
    }
    else {
        alert('There seems to be an error. Please try again.');
    }
    return prompt('Do you want to insure another vehicle? \"y\" or \"n\"')
  }

// use the variable restart as a flag to break off the do...while loop
let restart = 'y';
do 
  {
    restart = feeCalc();
  } 
while (restart === 'y');