javascript - JavaScript 中的 NaN 输出

Question

我在 JS 中遇到了一个问题，它真的在我的灵魂中燃烧!! 我想创建一个程序，提示用户输入他的名字，然后输入他的小时工资，然后输入他工作了多少小时？ 喜欢: 请输入您的姓名: 萨利赫 输入您的时薪:20 输入工作时间:8

我需要这个程序来打印一条消息: 你好萨利赫 您的时薪是:20 $ 您已经工作了:8小时 您的付款是:160 $

我制作的程序正在运行，但最后一行没有给出任何计算!它打印 NaN !!

请帮助我

代码如下:

function Worker(aName, anHourlyWage, numberOfHours) // initializing the worker function that asked in the question.
{
  this.name = aName;
  this.anHourlyWage = anHourlyWage;
  this.numberOfHours = numberOfHours;

  this.setHourlyWage = setHourlyWage;
  this.getName = getName;
  this.getHourlyWage = getHourlyWage;
  this.getHours = getHours;
  this.calculatePayment = calculatePayment;
  this.printDetails = printDetails;


}

function setHourlyWage(setHourlyWage) {
  this.anHourlyWage = anHourlyWage2;
}

function getName() {
  return this.name;
}

function getHourlyWage() {
  return this.anHourlyWage;
}

function getHours() {
  return this.numberOfHours;
}

function calculatePayment() {
  return this.getHourlyWage * this.getHours; //to return the multiplication of working hours function and  hourly wage function
}

function printDetails() {
  window.alert("Hello: " + this.getName() +
               "\n Your Wage Is: " + this.getHourlyWage() +
               " $" + "\n You Have Worked For: " + this.getHours() + " Hours" +
               "\n Your Payment Is: " + this.calculatePayment() + " $");
}


var name1 = window.prompt("Enter your name:", "");
var anHourlyWage1 = parseFloat(window.prompt("Enter the Hourly Wage:"));
var numberOfHours1 = parseFloat(window.prompt("Enetr the working hours:"));

var Worker1 = new Worker(name1, anHourlyWage1, numberOfHours1);
Worker1.printDetails();

Answer 1

问题在于，在您的 calculatePayment() 函数中，您没有调用 getHourlyWage() 和 getHours() 函数并将它们相乘返回值，您正在乘以对函数本身的引用。

更改此行:

return this.getHourlyWage * this.getHours;

对此:

return this.getHourlyWage() * this.getHours();

(请注意添加的括号。)