Javascript 函数不断返回NaN，学费计算器
我似乎无法正确使用我的函数……这是一个学费计算器。在这一点上，实习期和学期并不重要。这只是信用卡*信用卡成本，但它一直在返回Javascript 函数不断返回NaN，学费计算器,javascript,function,nan,Javascript,Function,Nan,我似乎无法正确使用我的函数……这是一个学费计算器。在这一点上，实习期和学期并不重要。这只是信用卡*信用卡成本，但它一直在返回 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Greendale Community College</title>
<script type="text/javascript">
/* <![CDATA[ */
/* ]]> */
var numCredits = 0;
var creditCost = 302;
var instate = 0;
var outstate = 0;
var international = 0;
var tuitionCost = number;
function calcTuition(numCredits, creditCost) {
var tuitionCost = numCredits * creditCost;
document.write("Your tuition cost is $" + tuitionCost);
}
</script>
</head>
<body>
<p><center><font face="impact" font size="200" color="green">Greendale Community College</font></center></p>
<center><img src="greendale.jpg" alt="greendale" width="512" height="256"/></center>
<h1><center>Tuition Calculator</center></h1>
<form name="calculator" action="" method="get">
<h2>Semester</h2>
<h3>(choose a semester)</h3>
<input type="radio" name="semesterFall"/> Fall 2018 <br />
<input type="radio" name="semesterSpring"/> Spring 2018 <br />
<input type="radio" name="semesterSummer"/> Summer 2018 <br />
<h2>Residency</h2>
<h3>(choose your residency)</h3>
<input type="radio" name="instate" /> In-State <br />
<input type="radio" name="outstate" /> Out-of-State <br />
<input type="radio" name="international" /> International <br />
<h2>Credits</h2>
<h3>(enter your number of credits)</h3>
<input type="text" name="numCredits" size="2" onchange="calcTuition(numCredits, creditCost)"/> Credits <br />
<input type="button" name="tuition" onclick="window.alert(calcTuition(numCredits, creditCost))" value="Calculate your Tuition" />
</form>
</body>
</html>
格林代尔社区学院
/* */
var numCredits=0；
var creditCost=302；
var instate=0；
var-outstate=0；
var国际=0；
var费用=数量；
功能配置（numCredits、creditCost）{
var TutionCost=numCredits*信用成本；
写下（“你的学费是$”+学费）；
}
格林代尔社区学院
学费计算器
学期
（选择一个学期）
2018年秋季
2018年春季
2018年夏季
住院医师
（选择您的居住地）
处于状态
不在状态
国际
信用
（输入您的学分数）
学分
numCredits$[object HTMLInputElement]document.getElementbyId
<script type="text/javascript">
var c_amount = 302;
function calcu_Tuition(Credits, c_amount) {
//var Credits
var Credits = document.getElementById("Credits").value //it will get the value of Credits text box and be transfer to Credits variable.
var tuition = 0;
var tuition = Credits * c_amount;
document.write("Your tuition cost is $" + tuition);
}
</script>
<body>
<h2>Credits</h2>
<h3>(enter your number of credits)</h3>
<input type="text" id="Credits" size="2" onchange="calcu_Tuition(Credits, c_amount)"/> Credits <br>
<button id="tuition" onclick="calcu_Tuition(c_amount)">Calculate your Tuition"</button>
</form>
</body>
var c_金额=302；
函数计算学费（学分、课程金额）{
//风险值信用
var Credits=document.getElementById（“Credits”）.value//它将获取Credits文本框的值，并传输到Credits变量。
var=0；
var学费=学分*c_金额；
写下（“你的学费是$”+学费）；
}
信用
（输入您的学分数）
学分
计算你的学费”
计算