Question

尝试在一些输入字段上进行一些数学计算，这给了我一些问题

这是我要做的事情

从客户成本中的折扣显示中减去零售成本
然后从首付中扣除客户成本并按期限除以获得分期付款
如果已更改则选择菜单，然后重新计算分期付款

http://jsfiddle.net/alienfactory1/GnTJ6/6/

 $( '#Discount' ).keyup(function() {
        paymentmethod();                         
    });

    $( '#finterm' ).change(function(){
            if ($('#finterm').val() == 12){
                  paymentmethod();
            } else if($('#finterm').val() == 18) {
                  paymentmethod();
            }
    });

     function paymentmethod(){

    var retailcost =  parseFloat($('#RetailCost').val().replace(/,/g, ''));
    var discount =  parseFloat($('#Discount').val());
    var downpay = parseFloat($('#DownPayment').val());
    var term = parseInt($('#finterm').val());
    var customercost =  $('#CustomerCost').val(retailcost - discount);

    var installment = customercost - downpay;
    var instald = installment / term;
    var test = $('#Instalments').val(instald); 
    $('#CustomerCost').autoNumeric('set', $(this).val());  
                     }

Retail Cost
 <input type="text" class="form-control input-sm" placeholder="Retail Cost" id="RetailCost" readonly value="3,145.00"><br>
Discount
<input type="text" class="form-control input-sm" placeholder="Discount" id="Discount"><br>
Cust Cost
<input type="text" class="form-control input-sm" placeholder="Customer Cost" id="CustomerCost" readonly><br>
Down Pay
<input type="text" class="form-control input-sm" placeholder="Down Payment"   id="DownPayment" readonly><br>
Term
<select class="form-control input-sm" id="finterm">
<option value="12">12</option>
<option value="18">18</option>
</select><br>
Installments
<input type="text" class="form-control input-sm" placeholder="Installments" id="Instalments" readonly>

Answer 1

我认为这可能是两个问题：

1）永远不会设置DownPayment。 2）在你的代码中，customercost是一个对象;

当我将DownPayment设置为2

时尝试此演示

http://jsfiddle.net/c6Xs5/1/

var retailcost =  parseFloat($('#RetailCost').val().replace(/,/g, ''));
var discount =  parseFloat($('#Discount').val());
var downpay = parseFloat($('#DownPayment').val());
var term = parseInt($('#finterm').val());
var customercost =  retailcost - discount;
$('#CustomerCost').val(customercost);                 
var installment = customercost - downpay;
var instald = installment / term;
var test = $('#Instalments').val(instald); 
$('#CustomerCost').autoNumeric('set', $(this).val());  
             }

Answer 2

尝试使用parseInt和parseFloat，以便JavaScript可以进行正确的数学运算。

减去和划分输入字段

2 个答案: