函数总和工作不正常 [英] Function sum not working properly javascript

问题描述

当我添加两个字段时，代码并没有总结它，而是添加了我输入的内容，继承我的代码

  function calculate_loan（）{
 var amountBorrowed = document.form.amountBorrowed.value; 
 var interest = document.form.interest.value / 100; 
 var payments = document.form.durationOfPayment.value; 
 var monthInterest = document.form.interestPerMonth.value; 
 var totalInt = document.form.totalinterest.value; 
 
 
 var monthly = amountBorrowed * interest; 
 var totalinterest = monthly * payments; 
 var totalAmount = amountBorrowed + totalinterest; $！
 
 $ b if（！isNaN（monthly）&& 
（monthly！= Number.POSITIVE_INFINITY）&& 
（monthly！）= Number.NEGATIVE_INFINITY ））{
 
 
 document.form.total.value = round（totalAmount）; 
 document.form.totalinterest.value = 
 round（monthly * payments）; 
 document.form.interestPerMonth.value = 
 round（每月）; 
} 
 
 else {
 document.form.amountOfPayement.value =; 
 document.form.total.value =; 
 document.form.totalinterest.value =; 
 
 
 
函数round（x）{
 return Math.round（x * 100）/ 100; 
} 
  

例如每月利息是：720总利息：2160借入金额：12000结果是120002160.我希望得到的结果是14,160请帮忙谢谢

>

  var amountBorrowed = Number（document.form.amountBorrowed.value）; 
 var interest = Number（document.form.interest.value）/ 100; 
 var payments = Number（document.form.durationOfPayment.value）; 
 var monthInterest = Number（document.form.interestPerMonth.value）; 
 var totalInt = Number（document.form.totalinterest.value）; 
  

When i add two fields, the code doesn't sum it but instead, it adds both what I inputted, heres my code

function calculate_loan() {
  var amountBorrowed = document.form.amountBorrowed.value;
  var interest = document.form.interest.value / 100;
  var payments = document.form.durationOfPayment.value;
  var monthInterest = document.form.interestPerMonth.value;
  var totalInt = document.form.totalinterest.value;


 var monthly = amountBorrowed * interest;
 var totalinterest = monthly * payments;
 var totalAmount = amountBorrowed + totalinterest;


  if (!isNaN(monthly) &&
    (monthly != Number.POSITIVE_INFINITY) &&
    (monthly != Number.NEGATIVE_INFINITY)) {


    document.form.total.value = round(totalAmount);
    document.form.totalinterest.value =
      round(monthly * payments);
          document.form.interestPerMonth.value =
      round(monthly);
  }

  else {
    document.form.amountOfPayement.value = "";
    document.form.total.value = "";
    document.form.totalinterest.value = "";
  }
}

function round(x) {
  return Math.round(x * 100) / 100;
}

for example Interest per month is : 720 Total interest: 2160 Amount Borrowed: 12000 the result is 120002160. I want the result to be 14,160 please help thanks

解决方案

You should parse the values as numbers

var amountBorrowed = Number(document.form.amountBorrowed.value);
var interest = Number(document.form.interest.value) / 100;
var payments = Number(document.form.durationOfPayment.value);
var monthInterest = Number(document.form.interestPerMonth.value);
var totalInt = Number(document.form.totalinterest.value);

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