Javascript循環程序

我正在嘗試製作一個javascript貸款計算器程序。我似乎無法讓我的循環在每一行上輸入不同的數字。假設顯示24個月，36個月，48個月和60個月開始支付的金額。我正在使用函數來進行計算，但我總是得到24個月的結果。我知道你必須將nummonths改爲36,48和60，但我不知道這樣做。我認爲循環會在每次循環時增加12個月。另外你會如何將數字格式化爲貨幣？最後我得到一個非常長的數字。我試着在calculate（）上做parseFloat，但是我得到一個錯誤。這裏是我的代碼：Javascript循環程序

<html> 
<BODY BGCOLOR="#FFC0CB"> 
<head> 
<title>Chapter 6 Assignment 2</title> 
</head> 
<body> 
<h1>Loan Calculator</h1> 

<script type="text/javascript"> 
var vehicleprice = window.prompt("What is the vehicle price?", ""); 
var downpayment = window.prompt("What is the amount of the down payment?", ""); 
var annualinterest = window.prompt("What is the annual interest rate for the loan?", ""); 
var nummonths = 24 
var loanamount = vehicleprice - downpayment 
var monthlyinterest = annualinterest/1200 

vehicleprice = parseFloat(vehicleprice).toFixed(2); 
downpayment = parseFloat(downpayment).toFixed(2); 
loanamount = parseFloat(loanamount).toFixed(2); 

function calculate() 
      { 
       var baseamount = Math.pow(1 + monthlyinterest, nummonths); 
       return loanamount * monthlyinterest/(1 - (1/baseamount)); 
      } 

document.write("Vehicle price: $" +vehicleprice+ "<br>"); 
document.write("Down payment: $" +downpayment+ "<br>"); 
document.write("Interest Rate: " +annualinterest+ "%<br>"); 
document.write("Loan Amount: $" +loanamount+ "<br>"); 

for (var count=2;count<=6;count+=1) 
    { 
    document.write(+calculate()+"<br />"); 
    } 
</script> 
</body> 
</html>

來源

2013-07-10 jaramore

好吧，你必須自行遞增nummonths。像這樣...

for (var count=2;count<=6;count+=1) 
{ 
    document.write(+calculate()+"<br />"); 
    nummonths += 12; 
}

此外，您還可以使用http://josscrowcroft.github.io/accounting.js/做貨幣格式。

來源

2013-07-10 23:53:42 mohkhan

謝謝！你如何將結果格式化爲貨幣？ – jaramore

我無法使accounting.js正常工作。你怎麼做呢？ – jaramore

看看這裏格式化http://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript – Stuart

既然你不使用count什麼，你也可以遍歷nummonths代替：

for (nummonths = 24; nummonths <= 60; nummonths += 12) { 
    document.write(calculate() + "<br />"); 
}

來源

2013-07-11 00:00:26 Stuart

Javascript循環程序

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