JavaScript 类引用

Question

您好，我有一个问题，如何在另一个类中引用一个类的数组

我有类(class)队列和类(class)球员 队列中将有一群玩家

类(class)玩家:

class Player {
    constructor(id, name) {
      this.id = id;
      this.name = name;
    }
  }

  module.exports = Player;

类队列

const Match = require('./Match');
// Queue class is a queue system with players.
class Queue {
    constructor() {
      this.players = [];
    }

    // addPlayers add multiple players into queue
    addPlayers(players) {
      this.players = this.players.concat(players);
    }

    // addPlayer adds a single player into queue
    addPlayer(player) {
      this.players.push(player);
    }

    // removePlayers remove multiple players from queue
    removePlayers(players) {
      players.forEach(p => {
        this.removePlayer(p);
      });
    }

    // removePlayer removes a single player from queue
    removePlayer(player) {
      const index = this.players.findIndex(p => p.id === player.id);
      if (index > -1) {
        this.players.splice(index, -1);
      }
    }

    // getPlayers return players that are currently on queue
    getPlayers() {
      return this.players;
    }

    // makeMatch makes match with provided condition and removes
    // matching players from queue
    makeMatch(condition) {
      // make matched players
      const matchedPlayers = this.players.filter(condition);
      console.log(matchedPlayers);
      // remove matched players from this.players
      this.removePlayers(matchedPlayers);
      // return new Match with matched players
      return new Match(matchedPlayers);
    }
  }

module.exports = Queue;

或者没有必要在另一个类中引用这个类。

Answer 1

在普通的 JavaScript 中，数组可以保存任何类型的对象，因此无需引用 Player 类。如果需要，您可以使用 instanceof ( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/instanceof ) 检查对象的实例类型，即用于创建对象的构造函数。例如。在你的 addPlayer 中:

addPlayer(player) {
  if(player instanceof Player) {
    this.players.push(player);
  } else {
    throw new Error('Only players can be added to the queue')
  }
}