javascript-在打字稿中获取类的属性

我有以下课程：

export class Test {

        private _rowsCount: string;
        public get RowsCount(): string {
            return this._rowsCount;
        };
        public set RowsCount(value: string) {
            this._rowsCount = value;
        };

        private _rowsCount2: string;
        public get RowsCount2(): string {
            return this._rowsCount2;
        };
        public set RowsCount2(value: string) {
            this._rowsCount2 = value;
        };
    }

我需要遍历特定类中的属性,我尝试了以下操作：

Object.keys(this).forEach((key)=> {
    console.log(key);
});

但是,这只是在私有字段上进行迭代的问题,我还尝试了以下方法,以获取所有方法和属性：

    for (var property in this) {
        if (this.hasOwnProperty(property)) {
            console.log(property);                
        }
    }

有没有人有办法解决吗？

谢谢！

解决方法:

如果您只需要获取吸气剂/吸气剂,则需要执行以下操作：

class Test {
    ...

    public static getGetters(): string[] {
        return Object.keys(this.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.prototype, name)["get"] === "function"
        });
    }

    public static getSetters(): string[] {
        return Object.keys(this.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.prototype, name)["set"] === "function"
        });
    }
}

Test.getGetters(); // ["RowsCount", "RowsCount2"]
Test.getSetters(); // ["RowsCount", "RowsCount2"]

(code in playground)

您可以将静态方法放在基类中,然后在扩展它时,子类也将具有这些静态方法：

class Base {
    public static getGetters(): string[] {
        return Object.keys(this.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.prototype, name)["get"] === "function"
        });
    }

    public static getSetters(): string[] {
        return Object.keys(this.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.prototype, name)["set"] === "function"
        });
    }
}

class Test extends Base {
   ...
}

Test.getGetters(); // work the same

(code in playground)

如果要将这些方法作为实例方法,则可以执行以下操作：

class Base {
    public getGetters(): string[] {
        return Object.keys(this.constructor.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.constructor.prototype, name)["get"] === "function"
        });
    }

    public getSetters(): string[] {
        return Object.keys(this.constructor.prototype).filter(name => {
            return typeof Object.getOwnPropertyDescriptor(this.constructor.prototype, name)["set"] === "function"
        });
    }
}

所做的更改是,您使用的是this.constructor.prototype,而不是使用this.prototype.
然后,您只需：

let a = new Test();
a.getGetters(); // ["RowsCount", "RowsCount2"]

(code in playground)

编辑

根据@Twois的评论,他指出在以es6为目标时它将不起作用,下面是一个可以使用的版本：

class Base {
    public static getGetters(): string[] {
        return Reflect.ownKeys(this.prototype).filter(name => {
            return typeof Reflect.getOwnPropertyDescriptor(this.prototype, name)["get"] === "function";
        }) as string[];
    }

    public static getSetters(): string[] {
        return Reflect.ownKeys(this.prototype).filter(name => {
            return typeof Reflect.getOwnPropertyDescriptor(this.prototype, name)["set"] === "function";
        }) as string[];
    }
}

主要区别在于：使用Reflect.ownKeys(this.prototype)代替Object.keys(this.prototype).