Question

我正在为我的班级编写一个程序，我们还没有真正了解如何使用逗号格式化数字，我已经做了一些研究并试图使用toLocalestring（），但是无法使它工作。我不确定我是不是把它放在正确的位置，或者是否有另一种方法将逗号放在我想要的地方。我会发布我的代码，看看是否有人知道我需要做什么。我只需要逗号显示在余额和利息列中。此外，我必须根据类要求使用console.log（）。

function displayWelcome() {
  console.log("Welcome!");
  console.log("This program will determine the time to pay off a credit card and the interest paid based on the current balance, the interest rate, and the monthly payments made.");
}

function calculateminimumPaymentment(balance, minimumPaymentRate) {
  return Math.max(20, balance * minimumPaymentRate);
}

function displayPayments(balance, interest, minimumPayment) {

  var pad = 17;
  console.log("Balance on your credit card: $" + balance.toFixed(2));
  console.log("Interest Rate: " + (interest * 100) + "%");
  console.log("Assuming a minimum payment of 2% of the balance ($20 min)");
  console.log("Your minimum payment would be: $" + minimumPayment);
  console.log();
  console.log('Year'.padStart(pad), 'Balance'.padStart(pad - 10), 'Payment Number'.padStart(pad - 1), 'Interest Paid'.padStart(pad - 4), 'Minimum Payment'.padStart(pad - 3));
  var acum = 0;
  var yearcount = 0;
  var paynum = 0;
  var interestPaid = 1;
  var year = 0;


  while (balance > 0) {
    paynum++;
    interestPaid = balance * (interest / 12);
    balance = Math.max(0, balance - (minimumPayment - balance * interest / 12));
    minimumPayment = Math.max(20, balance * minimumPaymentRate);
    acum = (parseFloat(acum) + parseFloat(interestPaid)).toFixed(2);
    if (yearcount % 12 === 0) {
      year++;
      console.log(
        ('' + year).padStart(pad),
        '$' + parseFloat(balance).toFixed(2).padStart(pad - 9),
        ('' + paynum).padStart(pad - 3),
        '$' + parseFloat(interestPaid).toFixed(2).padStart(pad - 5),
        '$' + parseFloat(minimumPayment).toFixed(2).padStart(pad - 3)
      );
    } else {
      console.log(
        ''.padStart(pad),
        '$' + parseFloat(balance).toFixed(2).padStart(pad - 9),
        ('' + paynum).padStart(pad - 3),
        '$' + parseFloat(interestPaid).toFixed(2).padStart(pad - 5),
        '$' + parseFloat(minimumPayment).toFixed(2).padStart(pad - 3)
      );
    }
    yearcount++;
  }
}

var balance = 1500;
var minimumPaymentRate = 0.02;
var interest = 0.18;

displayWelcome();
var minimumPayment = calculateminimumPaymentment(balance, minimumPaymentRate);

displayPayments(balance, interest, minimumPayment);

Answer 1

您必须自己格式化数字。首先将其转换为字符串，然后使用正则表达式将点替换为逗号：

＆＃13;

var a = 1234.5678;
var b = a.toFixed(2);
var c = b.replace(/\./, ',');

console.log(a, b, c);

＆＃13;

在Javascript中为数字添加逗号

1 个答案: