我试图通过调用其他函数来获得总成绩，从而将我的getExamGrades和getLabGrades一起添加，但是我没有尝试过。到目前为止，我所做的所有事情都消除了我调用的两个函数，并将所有内容留空。下面的代码工作得很好，只需要最后一部分的帮助，然后我就可以弄清楚其他变量和函数。
<!DOCTYPE html>
<html>
<header>
<script>
function getExamGrades()
{
var exam1 = document.getElementById("Exam1").value;
var exam2 = document.getElementById("Exam2").value;
var exam3 = document.getElementById("Exam3").value;
var Exams = Number(exam1) + Number(exam2) + Number(exam3);
document.getElementById("examGrade").innerHTML = Exams;
}
function getLabGrades()
{
var lab1 = document.getElementById("Lab1").value;
var lab2 = document.getElementById("Lab2").value;
var lab3 = document.getElementById("Lab3").value;
var Labs = Number(lab1) + Number(lab2) + Number(lab3);
document.getElementById("labGrade").innerHTML = Labs;
}
function getTotalGrades()
{
//var Total = Number(getExamGrades()) + Number(getLabGrades();
document.getElementByID("totalGrade").innerHTML = Total;
}
</script>
</header>
<body>
Exam1: <input type = "text" name="Exam1" value ="100" id="Exam1">
Exam2: <input type = "text" name="Exam2" value ="100" id="Exam2">
Exam3: <input type = "text" name="Exam3" value ="100" id="Exam3">
<br><br>
<button onClick="getExamGrades()"> Calculate Exam Grade </button>
Total: <output id="examGrade"> </output>
<br><br>
Lab1: <input type = "text" name="Lab1" value ="100" id="Lab1">
Lab2: <input type = "text" name="Lab2" value ="100" id="Lab2">
Lab3: <input type = "text" name="Lab3" value ="100" id="Lab3">
<br><br>
<button onClick="getLabGrades()"> Calculate Lab Grade </button>
Total: <output id="labGrade"> </output>
<br><br>
<button onClick="getTotalGrades()"> Calculate Total Grade </button>
Final Grade: <output id="totalGrade"> </output>
</body>
</html>
最佳答案
您的函数未返回值。如果他们做到了，那么您尝试的将行得通。像这样尝试：
function getExamGrades()
{
var exam1 = document.getElementById("Exam1").value;
var exam2 = document.getElementById("Exam2").value;
var exam3 = document.getElementById("Exam3").value;
var Exams = Number(exam1) + Number(exam2) + Number(exam3);
document.getElementById("examGrade").innerHTML = Exams;
return Exams;
}
function getLabGrades()
{
var lab1 = document.getElementById("Lab1").value;
var lab2 = document.getElementById("Lab2").value;
var lab3 = document.getElementById("Lab3").value;
var Labs = Number(lab1) + Number(lab2) + Number(lab3);
document.getElementById("labGrade").innerHTML = Labs;
return Labs;
}
function getTotalGrades()
{
var Total = Number(getExamGrades()) + Number(getLabGrades());
document.getElementById("totalGrade").innerHTML = Total;
}
我也为您解决了其他一些小问题。
您可以在这里看到一个有效的示例：http://jsfiddle.net/8js5uewc/2/
关于javascript - 增加2个功能，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/54318754/