[英]javascript mortgage calculator function
I got this almost working but for some reason have a remainder on the amortization chart. 我几乎可以使用它了,但是由于某种原因,在摊销表上还有剩余。 I think it may be an issue with rounding but am not sure. 我认为这可能与取整有关,但不确定。 If anyone has experience with this can you take a look at the monthly payment function. 如果有人对此有经验,可以看看每月付款功能。 This is part of a small backbone.js app I was developing and you can see it in action http://rvb.chrismills.la 这是我正在开发的一个小型ribs.js应用程序的一部分,您可以在运行中查看它http://rvb.chrismills.la
// Calculate mortgage based on selected values
calculateRBV: function() {
var _this = this;
// Make sure the correct downpayment is displaying
_this.calculateDP();
var _calcRent = $('#rvbRent').val();
var _calcVal = $('#rvbBuy').val();
var _calcDpPercent = $('#rvbDP').val()/100;
var _calcDpAmt = _calcVal * _calcDpPercent;
var _calcFinanced = _calcVal - _calcDpAmt;
var _calcLength = $('#rvbTerm').val() * 12;
var _calcRate = $('#rvbRate').val()/100/12;
var _calcTaxes = $('#rvbTaxes').val();
var _calcHpChange = $('#rvRentChangeVal').val();
var _calcRentChange = $('#rvRentChangeVal').val();
var _monthlyPayment = Math.floor((_calcFinanced*_calcRate)/(1-Math.pow(1+_calcRate,(-1*_calcLength)))*100)/100;
var _totalPayments = _monthlyPayment * _calcLength;
var _totalInterest = _totalPayments - _calcVal;
var _totalRent = _calcRent * _calcLength;
$('#rvbMonthly span').html(_this.formatNumber(_monthlyPayment));
$('#rvbTotal span').html(_this.formatNumber(_totalPayments));
$('#rvbInterest span').html(_this.formatNumber(_totalInterest));
_this.buildAmortizationChart(_calcFinanced, _monthlyPayment, _calcLength, _calcRate);
$('#rvbGraph').stop().slideDown(250);
$('#amortizationChart').stop().slideDown(250);
},
// Build Amortization Chart
buildAmortizationChart: function(total, monthlyPayment, months, rate) {
var _this = this;
$('#amortizationChart tbody').html(''); // clear previous
var _total = total;
var _monthlyPayment = monthlyPayment;
var _months = months;
var _rate = rate;
for(var i=1; i<=months; i++) {
var _interest = _total * _rate;
var _principal = _monthlyPayment - _interest;
_total = _total - _principal;
var aRow = '';
aRow += '<tr>';
aRow += '<td width="20%">';
aRow += i;
aRow += '</td>';
aRow += '<td width="20%">';
aRow += '$' + _monthlyPayment;
aRow += '</td>';
aRow += '<td width="20%">';
aRow += '$' + _this.formatNumber(_principal);
aRow += '</td>';
aRow += '<td width="20%">';
aRow += '$' + _this.formatNumber(_interest);
aRow += '</td>';
aRow += '<td width="20%">';
aRow += '$' + _this.formatNumber(_total);
aRow += '</td>';
aRow += '</tr>';
$('#amortizationChart tbody').append(aRow);
}
},
OK, I can see that on line 133 in index.js _total
is indeed not an integer: 好的,我可以看到index.js _total
第133行确实不是整数:
_total = _total - _principal;
If you want to get an integer, you can just do this: 如果要获取整数,可以执行以下操作:
_total = Math.round(_total - _principal);
Or, if you want to get a specific number of decimals, see this post: Formatting a number with exactly two decimals in JavaScript 或者,如果您想获得特定的小数位数,请参阅此文章: 在JavaScript中使用正好两个小数位数格式化数字
Is this what you meant by remainder? 这就是剩余的意思吗?
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