Javascript计算函数未返回值

Question

附加的javascript函数应该使用两个输入范围中的值以及表中初始单元格的值。然后它应该计算贷款的总还款额。

这是不是在预计'td还款'单元输出？

<script> 
 

 
    var repayment = function() { 
 

 
    }; 
 

 
document.repaymentcalc.amount.onchange = repayment; 
 

 
}; 
 

 
makeSomething(); 
 

 
function makeSomething() { 
 
    $('tbody tr').each(function(idx, row) { 
 
    var $row = $(row); 
 
    var initialRateCell = $row.find('td')[1]; 
 
    var repaymentCell = $row.find('td')[3]; 
 
    var rate = parseFloat($(initialRateCell).html()); 
 
    var repaymentVal = computeRepayment(rate); 
 
    $(repaymentCell).html(repaymentVal.repayment); 
 
    }); 
 
} 
 
$("#calcform :input").change(function() { 
 
    makeSomething(); 
 
}); 
 

 
function computeRepayment(rate) { 
 
    var x = parseInt(document.repaymentcalc.amount.value, 10); 
 
    var y = parseInt(rate, 10)/36500; 
 
    var z = parseInt(document.repaymentcalc.numberpayments.value, 10); 
 

 

 
var repayment = (x * y * z) + x; 
 

 
return { 
 
    repayment: '£' + repayment.toFixed(2), 
 
}; 
 
} 
 

 
< /script>

</head> 
 

 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> 
 

 

 

 
<form name="repaymentcalc" id="calcform" action=""> 
 

 
    Amount 
 
    <input id="amount" type="range" min="0" max="2500" step="50" value="100" style="width: 150px">Term 
 
    <input id="numberpayments" type="range" min="0" max="420" step="30" value="30" style="width: 150px"> 
 

 

 
</form> 
 

 
<table id="mortgagetable"> 
 

 
    <thead> 
 

 
    <tr class="producthd"> 
 
     <th class="lenderhd">Lender</th> 
 
     <th class="initialratehd">% p.a. fixed</th> 
 
     <th class="rateshd">% APR</th> 
 
     <th class="repaymenthd">Total Repayment</th> 
 
    </tr> 
 

 
    </thead> 
 

 
    <tbody> 
 

 
    <tr class="product"> 
 
     <td class="lender">Bank1</td> 
 
     <td class="initialrate">285</td> 
 
     <td class="rates">1204.39</td> 
 
     <td class="repayment"></td> 
 
    </tr> 
 
    <tr class="product"> 
 
     <td class="lender">Bank2</td> 
 
     <td class="initialrate">292</td> 
 
     <td class="rates">1221.5</td> 
 
     <td class="repayment"></td> 
 
    </tr> 
 
    <tr class="product"> 
 
     <td class="lender">Bank3</td> 
 
     <td class="initialrate">292</td> 
 
     <td class="rates">1295</td> 
 
     <td class="repayment"></td> 
 
    </tr> 
 
    <tr class="product"> 
 
     <td class="lender">Bank4</td> 
 
     <td class="initialrate">128</td> 
 
     <td class="rates">1221.5</td> 
 
     <td class="repayment"></td> 
 
    </tr> 
 

 
    </tbody> 
 

 
</table>

Answer 1

尝试

function computeRepayment(rate) { 
    var x = parseInt(document.repaymentcalc.amount.value, 10); 
    var y = parseInt(rate, 10)/36500; 
    var z = parseInt(document.repaymentcalc.numberpayments.value, 10); 


    return (x * y * z) + x; 
} 

和你的函数还款看上去是空的

Answer 2

你缺少你的函数返回语句。如果你想使用它，你需要返回你的价值：

function computeRepayment(rate) { 
    var x = parseInt(document.repaymentcalc.amount.value, 10); 
    var y = parseInt(rate, 10)/36500; 
    var z = parseInt(document.repaymentcalc.numberpayments.value, 10); 

    var repayment = (x * y * z) + x; 

    return repayment // to return your value 
} 

你的代码有一些错误。有一个空功能repayment和其他不正确的东西。在提出详细问题之前，再次检查您的代码。

例如为：

线6：删除};

Answer 3

要实际获得功能返回，您需要输入return的值。

正如你可以在这个简单的例子看看：

function multiplyTwoNumbers(numberOne, numberTwo){ 
    var result = numberOne * numberTwo; 
    return result; // Here you can see how the value is returned. 
} 
console.log(multiplyTwoNumbers(5,3); // Here we log the returned value. 

在你的情况，我认为你应该返回repayment变量。

function computeRepayment(rate) { 
    var x = parseInt(document.repaymentcalc.amount.value, 10); 
    var y = parseInt(rate, 10)/36500; 
    var z = parseInt(document.repaymentcalc.numberpayments.value, 10); 

    var repayment = (x * y * z) + x; 

    return repayment; // here you can see that your value is now returned 
}