Javascript中的对象数组

Question

我是学习 Javascript 的新手。在这个阶段，我想使用/贴花/初始化一个对象数组。

这是我初始化对象的代码：

function player(name){
    this.name = name;

    this.getName = function(){
        alert(this.name);
    }
}

这里是我需要使用玩家（对象）数组的地方

function hallOfFame(nbrPlayers){
    var arrayOfPlayers = [] 

}

谁能帮我请教如何创建这个对象数组。提前谢谢你:)

Answer 1

function createPlayerArray(number) {
  var players = [];
  for (i = 0; i < number; i++) {
    players.push(new Player("No Name"));
  }
  return players;
}

这将创建一个玩家数组

Answer 2

在实例化新的 HallOfFame 时，您可以执行以下操作来创建玩家数组。 addPlayer 原型可以让您稍后将新玩家添加到阵列中。通常 - 您不需要在 javascript 中为数组指定固定长度。大小是灵活的，所以你可以创建一个空数组来拥有一个玩家数组，然后推到它上面。

function Player(name){
    this.name = name;

    this.getName = function(){
        alert(this.name);
    }
}

function HallOfFame(players) {
 	this.players = Array.from(players);
}

HallOfFame.prototype.addPlayer = function(player) {
	this.players = this.players.concat(player);
}


let p1 = new Player("foo");
let p2 = new Player("bar");
let p3 = new Player("baz");

let hOf = new HallOfFame([p1,p2]); // instantiate HallOfFame and add two players

hOf.addPlayer(p3); // add another player

console.log(hOf); // will show you an HallOfFame object holding 3 players

Answer 3

仅供学习，如果太简单告诉我，我会删除它。

var dogs = ['Gustavo', 'Heisen', 'Berg', 'Jessie'],
    race = ['Labrador', 'Doberman', 'Spaniel', 'Husky'],
    result = [];
    
    dogs.forEach(function(v,i){ //iterate over each element from dogs array
      var obj = {}; //create an empty object to store our data
      obj[v] = race[i]; //assign a key (which is name of the dog) and it's value (his race) to obj
      result.push(obj); //push object into the result array
    });                 //repeat! (:
    
    console.log(result); //show our array of objects!

Answer 4

当您使用player 函数创建对象时，class 声明似乎是一个很好的用例，其目的是“提供更简单和更清晰的语法来创建对象”：

class Player {
    constructor(name) {
        function capitalizeName(fullName) {
          return fullName
          .split(' ')
          .map((s) => {
            return `${s.charAt(0).toUpperCase()}${s.slice(1).toLowerCase()}`
          })
          .join(' ')
        }
        this.name = capitalizeName(name)
    }

    getName () {
      return this.name
    }

    alertName () {
      alert(this.getName())
    }
}

然后您可以使用map 方法从字符串数组中创建一个Players 数组，如下所示：

function hallOfFame(playerNames) {
  return playerNames.map((playerName) => new Player(playerName))
}

您可以使用forEach 方法测试该函数：

> let myPlayerNames = ['ADA', 'bob', 'CaRlA', 'DenniS', 'ElITIa']
> let myHallOfFame = hallOfFame(myPlayerNames)
> myHallOfFame.forEach((player) => player.alertName())

Answer 5

//making array of books
var books = [];
    var new_book = {id: "book1", name: "twilight", category: "Movies", price: 10};
    books.push(new_book);
    new_book = {id: "book2", name: "The_call", category: "Movies", price: 17};
    books.push(new_book);
    console.log(books[0].id);
    console.log(books[0].name);
    console.log(books[0].category);
    console.log(books[0].price);

// also we have array of albums
var albums = []    
    var new_album = {id: "album1", name: "Ahla w Ahla", category: "Music", price: 15};
    albums.push(new_album);
    new_album = {id: "album2", name: "El-leila", category: "Music", price: 29};
    albums.push(new_album);
//Now, content[0] contains all books & content[1] contains all albums
var content = [];
content.push(books);
content.push(albums);
var my_books = content[0];
var my_albums = content[1];
console.log(my_books[0].name);
console.log(my_books[1].name); 

console.log(my_albums[0].name);
console.log(my_albums[1].name); 

这个例子适用于我： Expected output