我必須創(chuàng)建一個票價計算器，它還可以計算附加費率和金額。我的票價開關有效，但在我在提示中輸入大小寫后，附加費率開關返回為 NaN。我已將函數(shù) surchargeRate(cardType) 返回的值轉(zhuǎn)換為數(shù)字，但由于某種原因它仍然給我 NaN。我一直試圖找出問題所在，但無法弄清楚。這是我的代碼：function surchargeRate(cardType) { var surchargeRate; switch (cardType) { case "1": surchargeRate = 0.02; break; case "2": surchargeRate = 0.01; break; } // end switch return surchargeRate;}// This function calculates the surcharge amount.function surchargeAmount(ticketCost, surchargeRate) { return ticketCost * surchargeRate;}function determineTicketPrice(seatingAreaCategory) { var ticketPrice; switch (seatingAreaCategory) { case "S": case "s": ticketPrice = 180; break; case "C": case "c": ticketPrice = 150; break; case "B": case "b": ticketPrice = 100; break; case "R": case "r": ticketPrice = 70; break; default: ticketPrice = 0; break; } // end switch return ticketPrice;}function totalAmount(ticketPrice, ticketQty) { return ticketPrice * ticketQty;}function validateQty(ticketQty) { if (ticketQty >= 1 && ticketQty <= 20) { return true; } else { alert("Ticket number must be between 1 and 20"); return false; }}function init() { surchargeRate = surchargeRate(cardType); surchargeRate = Number(surchargeRate); var surcharge; var finalCost; if (surchargeRate == -1) { surchargeRate = new Error("Invalid input"); } else { surcharge = surchargeAmount(ticketCost, surchargeRate); }
1 回答
白衣非少年
TA貢獻1155條經(jīng)驗 獲得超0個贊
默認值
var surchargeRate = 0;或default: surchargeRate = 0;和var ticketPrice = 0;沒有提升變量
var- 函數(shù)windows.surchargeRate被覆蓋surchargeRate = surchargeRate(cardType);Init 在沒有任何輸入的情況下進行大量計算 - 首先獲取輸入，然后使用它
function surchargeRate(cardType) {
var surchargeRate;
switch (cardType) {
case "1":
surchargeRate = 0.02;
break;
case "2":
surchargeRate = 0.01;
break;
} // end switch
return surchargeRate;
}
// This function calculates the surcharge amount.
function surchargeAmount(ticketCost, surchargeRate) {
return ticketCost * surchargeRate;
}
function determineTicketPrice(seatingAreaCategory) {
var ticketPrice = 0;
switch (seatingAreaCategory) {
case "S":
case "s":
ticketPrice = 180;
break;
case "C":
case "c":
ticketPrice = 150;
break;
case "B":
case "b":
ticketPrice = 100;
break;
case "R":
case "r":
ticketPrice = 70;
break;
default:
ticketPrice = 0;
break;
} // end switch
return ticketPrice;
}
function totalAmount(ticketPrice, ticketQty) {
return ticketPrice * ticketQty;
}
function validateQty(ticketQty) {
if (ticketQty >= 1 && ticketQty <= 20) {
return true;
} else {
alert("Ticket number must be between 1 and 20");
return false;
}
}
function init() {
var beforeSurchargeOut = document.getElementById("beforeSurcharge");
var costOut = document.getElementById("amountDue");
var priceOut = document.getElementById("pricePerTicket");
var seatOut = document.getElementById("seatingArea");
var surchargeOut = document.getElementById("surcharge");
var validQtyOut = document.getElementById("ticketQty");
var surcharge;
var finalCost;
var seatingAreaCategory;
seatingAreaCategory = prompt("Please enter seating area category: ");
var ticketPrice = determineTicketPrice(seatingAreaCategory);
ticketPrice = Number(ticketPrice);
var ticketQty;
ticketQty = prompt("Please enter ticket quantity: ");
ticketQty = Number(ticketQty);
var ticketCost;
ticketCost = totalAmount(ticketPrice, ticketQty);
var cardType;
cardType = prompt("Enter your Card type. Enter 1 for American Express and 2 for Visa/Mastercard ");
var validQty = validateQty(ticketQty);
if (surcharge == -1) {
surcharge = new Error("Invalid input");
} else {
surcharge = surchargeAmount(ticketCost, surchargeRate(cardType));
}
finalCost = surcharge + ticketCost;
console.log(cardType);
console.log(surcharge);
beforeSurchargeOut.innerHTML = "Gross amount: " + ticketCost.toFixed(2);
costOut.innerHTML = "Amount due: " + finalCost.toFixed(2);
priceOut.innerHTML = "Price per ticket: " + ticketPrice.toFixed(2);
seatOut.innerHTML = "Your seating area is: " + seatingAreaCategory;
surchargeOut.innerHTML = "Card fee: " + surcharge.toFixed(2);
validQtyOut.innerHTML = "Number of tickets ordered: " + ticketQty;
}
window.onload = init;
<span id="beforeSurcharge"></span><br/>
<span id="amountDue"></span><br/>
<span id="pricePerTicket"></span><br/>
<span id="seatingArea"></span><br/>
<span id="surcharge"></span><br/>
<span id="ticketQty"></span><br/>
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