Jquery贷款计算器给我NaN变量

Question

我使用＆＃34; rate＆＃34; ＆＃34;量＆＃34; ＆＃34;个月＆＃34;和＃34;付款。＆＃34;

当用户点击计算时，它应该拉出＆＃34; rate＆＃34; ＆＃34;量＆＃34;和＆＃34;月＆＃34;并计算付款。开头的值是：

$('#loanAmount').val("$" + loanAmount); 
$('#apr').val(apr - 1.6 + "%"); 
$('#months').val(months);   

我试图删除任何非数字字符并进行数学计算，但它们都在返回＆＃34; NaN＆＃34;在我下面的第一个提醒中，我已经尝试了一切。

 $('#submit').on('click', function () {

        var rawLoanAmount1 = ($('#loanAmount').val());
        var rawApr1 = ($('#apr').val());
        var rawMonths1 = ($('#months').val());

        var rawLoanAmount2 = rawLoanAmount1.replace(/\D/g,'');
        var rawApr2 = rawApr1.replace(/\D/g,'');
        var rawMonths2 = rawMonths1.replace(/\D/g,'');

        var loanAmount = parseInt($(rawLoanAmount2).val());
        var apr = parseFloat($(rawApr2).val());
        var months = parseInt($(rawMonths2).val());


        alert("apr =" + apr + " loanAmount =" + loanAmount + " months =" + months);

        var newApr = apr / 1200;


        var firstStep = 1 + newApr;
        var secondStep = Math.pow(firstStep, months);
        var thirdStep = newApr * secondStep;

        var top = thirdStep;


        var firstStepB = 1 + newApr;
        var secondStepB = Math.pow(firstStepB, months);
        var thirdStepB = secondStepB - 1;

        var bottom = thirdStepB;


        var firstStepComp = top / bottom;
        var secondStepComp = loanAmount * firstStepComp;

        var compAnswer = secondStepComp;

        var compAnswerRounded = Math.round(compAnswer);

        var tal = parseInt($(compAnswerRounded).val());

        $('#payment').val(tal);

        return false;

    })