Javascript 为什么当所有变量&;输入是数字吗?
我知道我还没有设置验证,但我不明白为什么我在2/5结果字段中得到NaN。任何帮助都将不胜感激 正在生产NaN的油田是有趣且无收益的。我知道gainLoss与interestPay有关,所以如果我能解决这个问题,它可能会同时解决这两个问题 在monthlyBalance进行计算后,我尝试在它上使用parseFloat和parseInt,但这不起作用 有什么建议吗Javascript 为什么当所有变量&;输入是数字吗?,javascript,forms,calculator,Javascript,Forms,Calculator,我知道我还没有设置验证,但我不明白为什么我在2/5结果字段中得到NaN。任何帮助都将不胜感激 正在生产NaN的油田是有趣且无收益的。我知道gainLoss与interestPay有关,所以如果我能解决这个问题,它可能会同时解决这两个问题 在monthlyBalance进行计算后,我尝试在它上使用parseFloat和parseInt,但这不起作用 有什么建议吗 <!DOCTYPE html> <html lang="en"> <head> <meta h
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Bankrate Payment Calculator Test | Todd Adel</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="css/bootstrap-responsive.min.css" rel="stylesheet" media="screen">
<link href="css/style.css" rel="stylesheet" media="screen">
<script type="text/javascript">
function calculateThis(form) {
//Get a reference to the form id="calculator"
var theForm = document.forms["calculator"];
var balance = parseFloat(document.getElementById('balance').value);
var charge = parseFloat(document.getElementById('charge').value);
var spending1 = parseFloat(document.getElementById('spending1').value);
var spending2 = parseFloat(document.getElementById('spending2').value);
var spending3 = parseFloat(document.getElementById('spending3').value);
var cashBack1 = (parseFloat(document.getElementById('cashBack1').value)) / 100;
var cashBack2 = (parseFloat(document.getElementById('cashBack2').value)) / 100;
var cashBack3 = (parseFloat(document.getElementById('cashBack3').value)) / 100;
var everythingElse = parseFloat(document.getElementById('everythingElse').value);
var cashBackEE = (parseFloat(document.getElementById('cashBackEE').value)) / 100;
var payOff = parseFloat(document.getElementById('payOff').value);
var interestRate = (parseFloat(document.getElementById('interestRate').value)) / 100;
// Calculate monthlyBalance
var monthlyBalance = document.getElementById('monthlyBalance');
monthlyBalance.innerHTML = "$" + (balance + charge - payOff);
// Calculate interestPay
var interestPay = document.getElementById('interestPay');
interestPay.innerHTML = "$" + monthlyBalance * interestRate / 12;
// Calculate cashBackEarned
var cashBackEarned = document.getElementById('cashBackEarned');
cashBackEarned.innerHTML = "$" + ((spending1 * cashBack1) + (spending2 * cashBack2) + (spending3 * cashBack3) + (everythingElse * cashBackEE));
// Calculate gainLoss
var gainLoss = document.getElementById('gainLoss');
gainLoss.innerHTML = "$" + (cashBackEarned - interestPay);
// Calculate earnedRewards
var divobj = document.getElementById('earnedRewards');
if (cashBackEarned >= 0) {
var earnedRewards = true;
divobj.innerHTML = "Yes";
} else {
earnedRewards = false;
divobj.innerHTML = "No";
}
}
</script>
</head>
<body>
<form id="calculator" class="form-inline">
<div id="container">
<div id="inner" class="row">
<div class="row header"><h1>Are you paying for cash-back rewards?</h1></div>
<div class="row subhead"><h2>Fill out the form below to find out now</h2></div>
<div class="row data">
<div class="span10 question">What was your balance left over from last month?:</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="balance" id="balance" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">How much did you charge this month?</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="charge" id="charge" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">Choose a spending category
<select name="spending_category" size="1" class="input-med">
<option value="1">Spending Category 1</option>
<option value="2">Spending Category 2</option>
<option value="3">Spending Category 3</option>
</select>
</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="spending1" id="spending1" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">What was your % Cash Back?</div>
<div class="span2 input"><span>%</span><input class="input-mini" name="cashBack1" id="cashBack1" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">Choose a spending category
<select name="spending_category" size="1" class="input-med">
<option value="1">Spending Category 1</option>
<option value="2">Spending Category 2</option>
<option value="3">Spending Category 3</option>
</select>
</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="spending2" id="spending2" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">What was your % Cash Back?</div>
<div class="span2 input"><span>%</span><input class="input-mini" name="cashBack2" id="cashBack2" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">Choose a spending category
<select name="spending_category" size="1" class="input-med">
<option value="1">Spending Category 1</option>
<option value="2">Spending Category 2</option>
<option value="3">Spending Category 3</option>
</select>
</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="spending3" id="spending3" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">What was your % Cash Back?</div>
<div class="span2 input"><span>%</span><input class="input-mini" name="cashBack3" id="cashBack3" type="text" /></div>
</div>
<div class="row data span12"><a href="#" class="btn btn-primary" style="float:right">Add Category</a></div>
<div class="row data">
<div class="span10 question">What did you spend on everything else?</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="everythingElse" id="everythingElse" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">What was your % Cash Back?</div>
<div class="span2 input"><span>%</span><input class="input-mini" name="cashBackEE" id="cashBackEE" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">How much did you pay off?</div>
<div class="span2 input"><span>$</span><input class="input-mini" name="payOff" id="payOff" type="text" /></div>
</div>
<div class="row data">
<div class="span10 question">Interest rate on credit card</div>
<div class="span2 input"><span>%</span><input class="input-mini" name="interestRate" id="interestRate" type="text" /></div>
</div>
<div class="row data span12"><a href="#" class="btn btn-primary" style="float:right" onclick="calculateThis()">Calculate</a></div>
<div class="row span12"><h2>Results</h2></div>
<div id="results">
<div class="row data blue">
<div class="span10 question">Monthly Balance</div>
<div id="monthlyBalance" class="span2 input"><span>$</span></div>
</div>
<div class="row data white">
<div class="span10 question">How much will you pay in interest?</div>
<div id="interestPay" class="span2 input"></div>
</div>
<div class="row data blue">
<div class="span10 question">Cash back earned this month</div>
<div id="cashBackEarned" class="span2 input"></div>
</div>
<div class="row data white">
<div class="span10 question">How much $ did you gain / lose?</div>
<div id="gainLoss" class="span2 input"></div>
</div>
<div class="row data blue">
<div class="span10 question">Did you pay for your rewards?</div>
<div id="earnedRewards" class="span2 input"></div>
</div>
</div> <!-- End #results -->
</div> <!-- End #inner -->
</div> <!-- End #container -->
</form>
<script src="http://code.jquery.com/jquery.js"></script>
<script src="js/bootstrap.min.js"></script>
</html>
银行利率支付计算器测试|托德·阿德尔
函数计算此(形式){
//获取对表单id=“calculator”的引用
var theForm=document.forms[“calculator”];
var balance=parseFloat(document.getElementById('balance').value);
var charge=parseFloat(document.getElementById('charge').value);
var spending1=parseFloat(document.getElementById('spending1').value);
var spending2=parseFloat(document.getElementById('spending2').value);
var spending3=parseFloat(document.getElementById('spending3').value);
var cashBack1=(parseFloat(document.getElementById('cashBack1').value))/100;
var cashBack2=(parseFloat(document.getElementById('cashBack2').value))/100;
var cashBack3=(parseFloat(document.getElementById('cashBack3').value))/100;
var everythingElse=parseFloat(document.getElementById('everythingElse').value);
var cashBackEE=(parseFloat(document.getElementById('cashBackEE').value))/100;
var payOff=parseFloat(document.getElementById('payOff').value);
var interestRate=(parseFloat(document.getElementById('interestRate').value))/100;
//计算月平衡
var monthlyBalance=document.getElementById('monthlyBalance');
monthlyBalance.innerHTML=“$”+(余额+费用-支付);
//计息
var interestPay=document.getElementById('interestPay');
interestPay.innerHTML=“$”+月余额*利率/12;
//计算现金回笼
var cashBackEarned=document.getElementById('cashBackEarned');
cashbackowned.innerHTML=“$”+((支出1*现金返还1)+(支出2*现金返还2)+(支出3*现金返还3)+(其他一切*现金返还对象));
//计算增益
var gainLoss=document.getElementById('gainLoss');
gainLoss.innerHTML=“$”+(现金回笼-利息支付);
//计算所得税
var divobj=document.getElementById('earnedRewards');
如果(现金回笼>=0){
var earnedRewards=真;
divobj.innerHTML=“是”;
}否则{
earnedRewards=假;
divobj.innerHTML=“否”;
}
}
您是否支付现金返还奖励?
现在请填写下表以了解详情
你上个月的余额是多少
$
这个月你收了多少钱?
$
选择一个支出类别
支出类别1
支出类别2
支出类别3
$
你的现金返还率是多少?
%
选择一个支出类别
支出类别1
支出类别2
支出类别3
$
你的现金返还率是多少?
%
选择一个支出类别
支出类别1
支出类别2
支出类别3
$
你的现金返还率是多少?
%
你在其他方面花了多少钱?
$
你的现金返还率是多少?
%
你付了多少钱?
$
信用卡利率
%
结果
月结余
$
你要付多少利息?
本月赚取的现金返还
你得到/失去了多少美元?
你为你的奖励付钱了吗?
您似乎错过了函数中的值
document.getElementById('monthlyBalance')
应该是
document.getElementById('monthlyBalance').value;
在代码中,您有:
var monthlyBalance = document.getElementById('monthlyBalance');
interestPay.innerHTML = "$" + monthlyBalance * interestRate / 12;
这将检索ID为“monthlyBalance”的DOM元素
稍后你会:
var monthlyBalance = document.getElementById('monthlyBalance');
interestPay.innerHTML = "$" + monthlyBalance * interestRate / 12;
这意味着您正试图将DOM元素(不是数字)与interestRate/12相乘
尝试将代码更改为以下格式:
// Calculate monthlyBalance
var monthlyBalance = balance + charge - payOff;
var monthlyBalanceDomObject = document.getElementById('monthlyBalance');
monthlyBalanceDomObject.innerHTML = "$" + monthlyBalance;
首先得到一个DOM元素:var monthlyBalance=document.getElementById(…)
,然后您尝试在计算中使用该元素:interestPay.innerHTML=“$”+monthlyBalance*interestRate/12代码>
您需要为#monthlyBalance
元素及其计算值创建单独的变量
当您计算#gainLoss
的值时,这同样表示现金回扣
和利息支付
interestPay.innerHTML = "$" + monthlyBalance * interestRate / 12;
此时monthlyBalace是一个html元素,请尝试以下操作:
interestPay.innerHTML = "$" + (balance + charge - payOff) * interestRate / 12;
那么你在回笼现金和利息方面也犯了同样的错误。您希望它们是数字,但它们是html元素。尝试仅粘贴相关部分而不是完整代码。有趣的是,它修复了增益损失的计算,但不适用于有趣的路径。我试着用同样的方法做有趣的事情。现在,NaN错误消失了,但它在HTML中产生了一个空白结果。在为HTML元素创建了新变量之后,我可以继续在其他计算中使用monthlyBalance变量吗?是的,如果您已经分离了变量,如monthlyBalanceElement=document.getElementById('monthlyBalance');月余额=余额+费用-支付代码>。不要忘记将现金回笼
元素和利息支付
元素以及相应的值分开。