Question

因此在下面的代码中，我想知道this关键字在这里如何工作？ i和this从createstoken函数去哪里？

它是否转到令牌类中的this.id？如果可以，为什么？

class Player{
    constructor(playerNumber, tokenCount, tokenColor, active = false){
        this.playerNumber = playerNumber
        this.tokenCount = tokenCount
        this.tokenColor = tokenColor
        this.active = active
        this.tokens = [createTokens(21)]
    }
    //creates tokens
    createTokens(num){
        let array = []
        for(let i=0; i<num; i+=1){
            const token = new Token(i, this)
            array.push(token)
        }
        return array = []
    }
}//end player

class Token{
    constructor(){
        this.owner = owner;
        this.id = `token-${index}-${owner.id}`;
        this.dropped = false;
    }

}//end token

谢谢您的帮助！

Answer 1

在您的代码中，this表示在创建类的实例时正在构造的新对象：

class Player {
    constructor(playerNumber) {
        this.playerNumber = playerNumber;
        //This refers to whatever object is being created - in the below instance, `this` would refer to `newPlayer`
    }
}

const newPlayer = new Player(25);

Answer 2

被调用的当前对象将被当作this.checkout这个简单的例子，因为我已经使用“ this”变量构造了一个对象。

“ new”关键字可以在构造函数中用于引用唯一对象。

查看示例：

function Maker(name,age){
  //current object will be taken as this.
	this.name=name;
  this.age=age;
  return this;
}


let firstObject = new Maker('bathri',22);
let secondObject = new Maker('bathri',22);

let result = [firstObject,secondObject];
console.log("first object",firstObject);
console.log("second object",secondObject);
console.log("result",result);

在此示例中，关键字“ this”如何工作？

2 个答案: