编程新手求助：如何完成工资计算表单的代码编写？

我是编程新手，误选了需要Java先修课的第二学期课程，现在卡在了作业上。已经完成部分代码，但不知道怎么完成剩下的calcPay和printRow函数，作业要求如下：

作业任务 #

• 计算总工资：在calcPay()函数中，员工工资按小时工资×工作时长计算；若工作时长超过40小时，超出部分按1.5倍小时工资计算（例：45小时、时薪10美元，40小时按10美元/小时，5小时按15美元/小时）。
• 精度处理：在printRow()函数中，使用toFixed()方法将gross、tax、net变量转换为两位小数。

我从课程视频里学到了这段DOM操作的代码，但不知道怎么套用：

function checkData(){//  Validate the data//  Retrieve the data from the DOM    
    let name = document.getElementById("name").value;    
    let mark = document.getElementById("mark").value;    
    mark = parseFloat(mark);    
    if(name != "" && isNaN(mark)==false){    
        displayData(name,mark);    
        resetFields();
function displayData(name,mark){//  Declare variables    
    let passfail = "pass";    
    // Create the elements using DOM methods    
    let newTr = document.createElement("tr");    
    let newNameTd = document.createElement("td");    
    let newMarkTd = document.createElement("td");    
    let newPFTd = document.createElement("td");    
    if(mark < 50){        
        passfail = "fail";    
    // Add the data to the tds    
    newNameTd.innerHTML = name;    
    newMarkTd.innerHTML = mark;    
    newPFTd.innerHTML = passfail;    
    newTr.appendChild(newNameTd);    
    newTr.appendChild(newMarkTd);    
    newTr.appendChild(newPFTd);

现有HTML代码 #

<!DOCTYPE html><html>    
<head>        
    <script src="script.js"></script>        
    <link rel="stylesheet" type="text/css" href="styles.css" />        
    <meta charset="utf-8" />        
    <title>Competency 17</title>    
</head>    
<body>        
    <section id="content">            
        <h1>                
            Employee Payroll Entry Form            
        </h1>            
        <form id="payForm">                
            <label for="">Full Name:</label><input type="text" autofocus id="fullName"/>        
            <br />                
            <label for="">Hours Worked:</label><input type="text" id="hoursWorked" /><br        
            />                
            <label for="">Hourly Rate:</label><input type="text" id="hourlyRate" />                
            <footer>                    
                <button id="calcButton" type="button">Calculate</button>                
            </footer>            
        </form>            
        <h1>                 
            Employee Payroll Summary Report            
        </h1>            
        <table id = "employees">                
            <thead>                    
                <tr>                        
                    <th>Employee Name</th>                        
                    <th>Gross Pay</th>                        
                    <th>Tax</th>                        
                    <th>Net Pay</th>                     
                </tr>                
            </thead>                
            <tbody>                
            </tbody>            
        </table>        
    </section>    
</body></html>

现有JavaScript代码 #

document.addEventListener("DOMContentLoaded", load);
function load(){    
    let calcButton = document.getElementById('calcButton');    
    calcButton.addEventListener('click', calc);    
    clearFields();
}
function calc(){    
    let name = document.getElementById('fullName').value;    
    let hours = document.getElementById('hoursWorked').value;    
    let rate = document.getElementById('hourlyRate').value;    
    if(name == "" || hours =="" || rate==""){        
        clearFields();        
        return;    
    }    
    let pay = calcPay(hours,rate);    
    let taxes = getTax(pay);    
    let net = pay-taxes;    
    printRow(name, pay, taxes, net);    
    clearFields();
}
function clearFields(){    
    document.getElementById('fullName').value = "";    
    document.getElementById('hoursWorked').value = "";    
    document.getElementById('hourlyRate').value = "";    
    document.getElementById('fullName').focus();
}
/*    calcPay function    
receives hours and hourly rate values    
returns the calculated pay*/
function calcPay(hours, rate){    
    let }
/*    getTax function    
receives gross pay    
returns relative tax rate*/
function getTax(funcGross){    
    let funcTax = 0;    
    if (funcGross<250){        
        funcTax = funcGross*.25;    
    }    
    else{        
        if (funcGross<500){            
            funcTax = funcGross*.3;        
        }        
        else{            
            if (funcGross<=750){                
                funcTax = funcGross*.4;            
            }            
            else{                
                funcTax = funcGross*.5;            
            }        
        }    
    }return funcTax;
}
/*     printRow function    
receives name, gross, taxes, and net pay    
formats currency    
prints a row in the table*/
function printRow(name, gross, taxes, net){    
    //  Set values to 2 decimal places here    
    let tbody = document.getElementsByTagName("tbody")[0];    
    let tr = document.createElement("tr");    
    let td = document.createElement("td");    
    let td1 = document.createElement("td");    
    let td2 = document.createElement("td");    
    let td3 = document.createElement("td");    
    td.innerHTML = name;    
    td1.innerHTML = `$${gross}`;    
    td2.innerHTML = `$${taxes}`;    
    td3.innerHTML = `$${net}`;    
    tr.appendChild(td);    
    tr.appendChild(td1);    
    tr.appendChild(td2);    
    tr.appendChild(td3);    
    tbody.appendChild(tr);
}

我搜索了很多薪资计算方法，但都不符合要求，希望有人能帮我补全calcPay和printRow函数的代码，实现薪资计算并把结果添加到表格里。

内容的提问来源于stack exchange，提问作者Codejester42