我有一个HTMl表单输入学生姓名和成绩，其中应该使用JavaScript来计算然后在屏幕上打印的成绩。如果我评论我的JavaScript的内容，我的HTMl工作正常，但如果我不这样做则不行。错误是我注释掉的代码中的某个地方，但我无法找到它（或者它们）。
HTML表单将提交，提醒用户，并正确显示我的消息，只要它输入具体的分数和分数，而不是尝试通过getGrade（）和getScore（）获取它。这就是为什么我知道这个bug存在于JavaScript中。
我在JavaScript控制台中运行该页面以查找错误，但没有红旗错误。
这是我的第一个HTML / JavaScript程序，我不是很擅长。无论如何，它是一天晚了，不到两个小时，它将延迟两天，所以如果有人能提供帮助，我会非常感激。这是代码，对不起，如果它太多了：
<!DOCTYPE html>
<html>
<head>
<title>Joe Peterson's Assignment 7</title>
<script>
function calculateGrade(){
document.getElementById("form1").style.display = "none";
document.getElementById("p1").style.display = "block";
var fname = document.getElementById("LastName").value;
var lname = document.getElementById("FirstName").value;
var valMidterm = document.getElementById("MidtermScore").value;
var valFinal = document.getElementById("FinalScore").value;
var lMidterm = document.getElementById("MidtermLetter").value;
var lFinal = document.getElementById("FinalLetter").value;
var homeworkArray = document.getElementById("HomeworkScores").value.split(',');
var classworkArray = document.getElementById("ActivityScores").value.split(',');
/*
var s1 = new Student(fname, lname);
for (var i = 0; i < classworkArray.length; i++)
s1.addGradedActivity(classworkArray[i]);
for (var i = 0; i < homeworkArray.length; i++)
s1.addGradedHomework(homeworkArray[i]);
s1.setMidterm(valMidterm, lMidterm);
s1.setFinal(valFinal, lFinal);
var grade = s1.getGrade();
var score = s1.getScore();
*/
document.getElementById("span1").innerHTML = (grade);
document.getElementById("span2").innerHTML = (score);
document.getElementById("fname").innerHTML = (fname);
document.getElementById("lname").innerHTML = (lname);
alert(document.getElementById("FirstName").value);
return false;
}
/*
function Coursework(){
var sum = 0;
var num = 0;
this.addScore = function(score){
if (score < 0) {score = 0;}
if (score > 100) {score = 100;}
sum += score;
num++;
}
this.getAverage = function(){
return (sum/num);
}
}
function Exam(){
var score = 0;
var grade = "";
this.Exam = function(Score, Grade)
{
if (Score < 0) {Score = 0;}
if (Score > 100) {Score = 100;}
score = Score;
if (Grade != "A" && Grade != "B" && Grade !="C"
&& Grade !="D" && Grade != "F")
{
console.log("You have submitted a bad grade for an Exam, value of:G.");
Grade = "F";
}
grade = Grade;
}
this.getScore = function(){
return score;
}
this.getGrade = function(){
return grade;
}
}
function Student(){
var firstName;
var lastName;
var midterm;
var finalExam;
var homework = new Coursework();
var inclass = new Coursework();
this.Student = function(first, last){
firstName = first;
lastName = last;
}
this.setMidterm = function(score, grade){
midterm = new Exam(score, grade);
}
this.setFinal = function(score, grade){
finalExam = new Exam(score, grade);
}
this.addGradedHomework = function(score){
homework.addScore(score);
}
this.addGradedActivity = function(score){
inclass.addScore(score);
}
this.getFinalGrade = function(totalScore)
{
var grade = totalGrade(totalScore);
var grade2 = "F";
var midGrade = this.convertGrade(midterm.getGrade());
var finGrade = this.convertGrade(finalExam.getGrade());
if (midGrade < finGrade)
{
grade2 = midterm.getGrade();
}
else
{
grade2 = finalExam.getGrade();
}
if (convertGrade(grade) > convertGrade(grade2))
return(grade);
else
return(grade2);
}
this.totalGrade = function(totalScore)
{
var totalGrade = "F";
if (totalScore >= 90)
totalGrade = "A";
else if (totalScore >= 80)
totalGrade = "B";
else if (totalScore >= 70)
totalGrade = "C";
else if (totalScore >= 60)
totalGrade = "D";
else
totalGrade = "F";
return (totalGrade);
}
this.convertGrade = function(letter)
{
var num = 0;
if (letter === "A")
num = 4;
else if (letter === "B")
num = 3;
else if (letter === "C")
num = 2;
else if (letter === "D")
num = 1;
else
num = 0;
return(num);
}
this.getScore = function()
{
var totalScore = 0;
totalScore += inclass.getAverage() * .15;
totalScore += homework.getAverage() * .25;
totalScore += midterm.getScore() * .25;
totalScore += finalExam.getScore() * .35;
return totalScore;
}
this.getGrade = function()
{
var totalScore = 0;
totalScore += inclass.getAverage() * .15;
totalScore += homework.getAverage() * .25;
totalScore += midterm.getScore() * .25;
totalScore += finalExam.getScore() * .35;
var grade = getFinalGrade(totalScore);
return grade;
}
}
*/
</script>
</head>
<body>
<p><h1>Joe Peterson's Assignment 7</h1></p>
<form name="input" id="form1" onsubmit="return calculateGrade()" style="display:form">
First name: <input type="text" name="FirstName" id="FirstName" value="Joe"><br>
Last name: <input type="text" name="LastName" id="LastName" value="Peterson"><br>
Homework Scores (separate with commas): <input type="text" name="HomeworkScores" id="HomeworkScores" value="90, 80, 98"><br>
Activity Scores (separate with commas): <input type="text" name="ActivityScores" id="ActivityScores" value="71, 65, 96"><br>
Midterm Exam Percentage: <input type="text" name="MidtermScore" id="MidtermScore" value="91"><br>
Midterm Exam Letter Grade: <input type="text" name="MidtermLetter" id="MidtermLetter" value="A"><br>
Final Exam Percentage: <input type="text" name="FinalScore" id="FinalScore" value="75"><br>
Final Exam Letter Grade: <input type="text" name="FinalLetter" id="FinalLetter" value="C"><br>
<input type="submit" value="Submit">
</form>
<p id="p1" style="display:none">Final course grade for <span id="fname">Joe</span> <span id="lname">Peterson</span> is: <span id="span1">X</span> (<span id="span2">yy</span>%)</p>
</body>
</html>