Javascript 从方法（NODEJS）中的回调获取主类

我需要从数据库中填写个人资料。 但无法获取主类的属性。请告诉我可以解决什么问题

类别：

class Operator {
    constructor(id) {
        this.operator_id = id;
        this.profiles = {};
    }

    getProfiles(){
        return this.profiles;
    }

    loadProfiles(){
        console.log('loading profiles');
        console.log(this.profiles);

        db.queryAll(`
        SELECT
        profiles.id,
        profiles.domain_id,
        profiles.name
        FROM
        operators_to_profiles
        LEFT JOIN profiles ON profiles.id = operators_to_profiles.profile_id
        WHERE operator_id = ${this.operator_id}
        `, function (data){
            console.log(Operator.getProfiles());
        });
    }
}

module.exports = {
    create : function (operator_id) {
        return new Operator(operator_id);
    }
};

let operator = Operators.create(operatorId);
operator.loadProfiles();

用法：

class Operator {
    constructor(id) {
        this.operator_id = id;
        this.profiles = {};
    }

    getProfiles(){
        return this.profiles;
    }

    loadProfiles(){
        console.log('loading profiles');
        console.log(this.profiles);

        db.queryAll(`
        SELECT
        profiles.id,
        profiles.domain_id,
        profiles.name
        FROM
        operators_to_profiles
        LEFT JOIN profiles ON profiles.id = operators_to_profiles.profile_id
        WHERE operator_id = ${this.operator_id}
        `, function (data){
            console.log(Operator.getProfiles());
        });
    }
}

module.exports = {
    create : function (operator_id) {
        return new Operator(operator_id);
    }
};

let operator = Operators.create(operatorId);
operator.loadProfiles();

输出：

class Operator {
    constructor(id) {
        this.operator_id = id;
        this.profiles = {};
    }

    getProfiles(){
        return this.profiles;
    }

    loadProfiles(){
        console.log('loading profiles');
        console.log(this.profiles);

        db.queryAll(`
        SELECT
        profiles.id,
        profiles.domain_id,
        profiles.name
        FROM
        operators_to_profiles
        LEFT JOIN profiles ON profiles.id = operators_to_profiles.profile_id
        WHERE operator_id = ${this.operator_id}
        `, function (data){
            console.log(Operator.getProfiles());
        });
    }
}

module.exports = {
    create : function (operator_id) {
        return new Operator(operator_id);
    }
};

let operator = Operators.create(operatorId);
operator.loadProfiles();

加载剖面

{}

TypeError:Operator.getProfiles不是函数

已解决：

class Operator {
    constructor(id) {
        this.operator_id = id;
        this.profiles = {};
    }

    getProfiles(){
        return this.profiles;
    }

    loadProfiles(){
        console.log('loading profiles');
        console.log(this.profiles);

        db.queryAll(`
        SELECT
        profiles.id,
        profiles.domain_id,
        profiles.name
        FROM
        operators_to_profiles
        LEFT JOIN profiles ON profiles.id = operators_to_profiles.profile_id
        WHERE operator_id = ${this.operator_id}
        `, function (data){
            console.log(Operator.getProfiles());
        });
    }
}

module.exports = {
    create : function (operator_id) {
        return new Operator(operator_id);
    }
};

let operator = Operators.create(operatorId);
operator.loadProfiles();

---

您应该将

操作符.getProfiles（）

设置为

this.getProfiles（）

（因为`getProfiles（）不是静态的），并更改将其包装为箭头函数的函数。通过在下面添加答案（而不是编辑自己的问题），您可以自由回答自己的问题