javascript - 为什么我的计划没有给我分配的折扣？

Question

因此，除了我的 if 语句与 >=largeOrder 之外，一切正常，它不会加入折扣。对于承包商雇员来说也不会。我们必须做出决定，为每个人提供最好的折扣，如果员工是承包商，他将获得承包商折扣。然而，常规承包商的 if 声明是完美的并且工作正常。所有输出都是正确的。所以我猜测它与我的嵌套 if 语句有关......

//assumptions
var employeeDiscount = .1;
var largeOrder = 800;
var largeOrderDiscount = .05;
var smallOrderDiscount = 0;
var contractorDiscount = .2;
var salesTax = .08;
var seniorTax = 0;
var seniorAge = 90;
var tax, typeOfCustomer, orderAmount, employeeContractor;
var discount, discountAmount, subtotal, finalPrice, taxTotal;


//input

age = prompt("How old is the customer", "");
age = parseInt(age);
orderAmount = prompt("How much is the order", "");
orderAmount = parseInt(orderAmount);
typeOfCustomer = prompt("What type of customer is it, regular, employee, or contractor", "");


//calculations

if (age >= seniorAge) {
    tax = seniorTax;
} else {
    tax = salesTax;
}
if (typeOfCustomer == "regular") {
    if (orderAmount >= largeOrder) {
        discount = largeOrderDiscount;
    } else {
        discount = smallOrderDiscount;
    }
}
if (typeOfCustomer == "employee") {
    employeeContractor = prompt("is the employee a contractor?", "");

    if (employeeContractor == "yes") {
        discount = contractorDiscount;
    } else {
        discount = employeeDiscount;
    }
}
if (typeOfCustomer == "contractor") {
    discount = contractorDiscount;
} else {
    discount = smallOrderDiscount;
}
taxTotal = orderAmount * tax;
discountAmount = orderAmount * discount;
subtotal = orderAmount - discountAmount;
finalPrice = subtotal + taxTotal;

//output

document.write("Order amount: $" + orderAmount);
document.write("<br>Discount amount: $" + discountAmount);
document.write("<br>Subtotal: $" + subtotal);
document.write("<br>Taxes: $" + taxTotal);
document.write("<br>Final Price is: $" + finalPrice);

// -->
</script>

Answer 1

我认为你需要使用if-else-if

修改了 if block

if (typeOfCustomer == "regular") {
    if (orderAmount >= largeOrder) {
        discount = largeOrderDiscount;
    } else {
        discount = smallOrderDiscount;
    }
} else if (typeOfCustomer == "employee") {
    employeeContractor = prompt("is the employee a contractor?", "");

    if (employeeContractor == "yes") {
        discount = contractorDiscount;
    } else {
        discount = employeeDiscount;
    }
}  else  if (typeOfCustomer == "contractor") {
    discount = contractorDiscount;
} else {
    discount = smallOrderDiscount;
}

根据我的理解，代码中的问题是最后一个 if block 。

 if (typeOfCustomer == "contractor") {
    discount = contractorDiscount;
} else {
    discount = smallOrderDiscount;  // <== Here previous discount will be overridden if typeOfCustomer is not contractor
}