如何将对象传递到引用其他对象以更改其值的类中

Question

我正在制作一个闲置游戏库供我使用，我不确定如何创建一个系统，该系统需要成对的资源和数量，检查它们是否可用，如果可用，则调整所有值。访问上述资源并将它们放入一个对象中以传递给 Building() 是相当困难的。

我需要做的是从

player.resources

中对象内的方法获取

player.building

中的资源，其中包含每种资源的数量。 我想将所有这些信息传递到一个

new class Building()

对象中，如下所示：

// Inside player.buildings
purple: new Building(0, "#purple", /*data goes here*/)

class Building extends Thing(){
    constructor(amount, tag, requirements){
        super(amount, tag)
        this.requirements = requirements
        /*
        This is roughly the shape of the input. It is the reference to the resources and the respective amounts needed.
        requirements = {
            player.resources.red: 5,
            player.resources.blue: 92,
        }
        */
    }

    buy(){
        // Check if each of the required resources are avaliable
        for(let resource of this.requirements){
            if(resource.amount >= resource.needed){
                continue
            }else{
                //Break the loop and return false, signaling that you cant buy this right now.
                return false
            }
        }
        // If you can buy it then go through each of the required resources and decrement them.
        for(let resource of this.requirements){
             resource.amount -= resource.needed
        }
        this.amount += 1
    }
}

对于上下文，事物或资源具有以下结构：

resource:{
   amount: x,
   tag: "#tag", //Used for rendering on the page
}

玩家对象具有这样的结构

player:{
   resources:{
      red: {
         amount: 3,
         tag: "#red"
   },
      blue: {
        amount: 4,
        tag: "#blue"
   },
   buildings:{
      purple: {
         amount: 0,
         tag: "#purple",
         requirements: "data structure",
      }
   },
}

Answer 1

调用buy函数时可以传入player对象。 然后用你之前的逻辑，你可以检查玩家是否有足够的资源，然后扣除它们。 这里我也将建筑物添加到玩家的“建筑物”对象中作为示例。

class Thing {
  constructor(amount, tag){
    this.amount = amount;
    this.tag = tag;
  }
}

class Building extends Thing {
    constructor(amount, tag, requirements){
        super(amount, tag)
        this.requirements = requirements;
    }

    buy(player){
        // Check if each of the required resources are avaliable
        for (let [type, amount] of Object.entries(this.requirements)) {
            if(player.resources[type].amount >= amount){
                continue
            }else{
                return false
            }
        }
        // If you can buy it then go through each of the required resources and decrement them.
        for (let [type, amount] of Object.entries(this.requirements)) {
          player.resources[type].amount -= amount;
        }
        this.amount += 1;
        // do something with this building (add it to the player's "buildings" property, for example)
        player.buildings[this.tag] = this;
        
        return true;
    }
}

const logCabin = new Building(0, "log cabin", {red: 1, blue: 1});

const player1 = {
   resources:{
      red: {
         amount: 3,
         tag: "#red"
      },
      blue: {
        amount: 4,
        tag: "#blue"
      }
   },
   buildings:{}
};

let result = logCabin.buy(player1);
console.log(result);
console.log(player1);