设置器和获取器问题

如何解决设置器和获取器问题

为什么age（）的设置器中未执行if语句？它应返回“年龄必须是数字”；

get语句有效，但set语句无效。

class Player {
    constructor(name,age,position) {
        this._name = name;
        this._age = age;
        this._position = position;
    }
set age(value){ 
    if(value.isNaN()) {
        return "Age must be a number";
    } else {
        return this._age;
    }
}
get name() {
        return this._name;
    }
get age() {
    if(typeof this._age === "number") {
        return this._age;
    }else{
        return "Cant fetch players age"
    }
}
get position() {
    return this._position;
}
};
const test = new Player("Peter","38","Forward")
console.log(test.age)

解决方法

您的构造函数应调用setter而不是实例变量：

class Player {
    constructor(name,age,position) {
        this._name = name;
        this.age = age;  //call setter
        this._position = position;
    }
    ...