带有参数或返回值的方法 - Javascript

Question

我很困惑如何编辑我的代码，以便我可以拥有至少一种使用参数（或返回值）的方法，而不仅仅是使用 console.log。我很感激你们可以提供的任何帮助或建议谢谢！ :) 这是我的代码：

class Planet{
  constructor(name, numberOfMoons, size) {
    this.name = name;
    this.numberOfMoons = numberOfMoons;
    this.size = size;
  }
  orbit(){
    console.log(this.name + ' is a planet and therefore orbits around the sun.');
  }
}

//inheritance class

 class DwarfPlanet extends Planet{
  constructor(name, numberOfMoons, size, orbitalNeighbourhood) {
    super(name, numberOfMoons, size);
    this.orbital = orbitalNeighbourhood;
  }

  getOrbital(){
    console.log(this.name + " is a dwarf planet because it doesn't have a clear orbital neighnourhood ");
  }

}

let earth = new Planet('Earth', 1 , 6371);
earth.orbit();

let pluto = new DwarfPlanet("Pluto", 5 , 1188, 'Kuiper Belt');
pluto.getOrbital();

//Array of Objects
var stars = [
    {
        name: 'Sun',
        temperature: 5778,
        colour: 'White'
    },
    {
        name: 'Pistol',
        temperature: 11800,
        colour: 'Blue'
    },
    {
        name: "Antares",
        temperature: 3500,
        colour: "Red"
    }
];
console.log("Fun Fact: the biggest star isn't the sun, instead it is a blue star called 'Pistol'. Here's some information about it: ");
console.log(stars[1]);

Answer 1

所以大家说的都是对的，但我只是想总结几点。

你必须从一个方法中实际返回一个值，它才能有一个值。然后您可以console.log 返回的值。如果你愿意，你可以两者都做。

对于方法，您可以以任何方式传递参数。例如

const func = (param1, param2) => {
  return `This is Param 1: ${param1}  This is Param 2: ${param2}`
} // This function returns a String

console.log(func("Hi", "Hello"));

因此，对于您对类所做的事情，您只需像任何其他普通函数一样将参数传递给方法。我更新了您的代码示例以包含如何使用 stars 数组执行此操作。

我还更新了实例方法，使它们返回实际值。

如果我是你，我会查看类似 W3 文章的内容：https://www.w3schools.com/js/js_functions.asp

还有这篇关于课程的 MDN 文章：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes

只是为了了解基础。

祝你好运

class Planet{
    constructor(name, numberOfMoons, size) {
        this.name = name;
        this.numberOfMoons = numberOfMoons;
        this.size = size;
    }
    orbit(){
        return `${this.name} is a planet and therefore orbits around the sun.`
    }
}

//inheritance class

class DwarfPlanet extends Planet{
    constructor(name, numberOfMoons, size, orbitalNeighbourhood) {
        super(name, numberOfMoons, size);
        this.orbital = orbitalNeighbourhood;
    }

    getOrbital(){
        return `${this.name} is a dwarf planet because it doesn't have a clear orbital neighnourhood "`
    }

}

let earth = new Planet('Earth', 1 , 6371);
console.log(earth.orbit());

let pluto = new DwarfPlanet("Pluto", 5 , 1188, 'Kuiper Belt');
console.log(pluto.getOrbital());

class Stars {
    constructor() {
        this.stars = [];
    }

    addStars(star){
        this.stars.push(star);
    }

    addMultipleStars(stars){
        this.stars = [...this.stars, ...stars]
    }

    allStars(){
        return this.stars;
    }
}
//Array of Objects
var stars = [
    {
        name: 'Sun',
        temperature: 5778,
        colour: 'White'
    },
    {
        name: 'Pistol',
        temperature: 11800,
        colour: 'Blue'
    },
    {
        name: "Antares",
        temperature: 3500,
        colour: "Red"
    }
];

let startContainer = new Stars();
startContainer.addMultipleStars(stars);
const allStars = startContainer.allStars();
allStars.forEach(star => {
    console.log(JSON.stringify(star))
})