本文介绍了如何为属性创建TypeScript @enumerable(false)装饰器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想在TypeScript中创建一个装饰器,以便能够使类属性不可枚举。

I want to create a decorator in TypeScript in order to be able to make a class property not enumerable.

我在这里找到了@enumerable的示例:

,但这似乎仅适用于方法,不适用于属性:

I found an example of @enumerable here:https://www.typescriptlang.org/docs/handbook/decorators.html#method-decoratorsbut that only seems to work for methods, not properties:

是否可以为类属性创建@enumerable装饰器?

Is there a way to create a @enumerable decorator for a class property?

谢谢

推荐答案

我最终得到了以下解决方案:

I ended up with this solution:

/**
 * @enumerable decorator that sets the enumerable property of a class field to false.
 * @param value true|false
 */
function enumerable(value: boolean) {
    return function (target: any, propertyKey: string) {
        let descriptor = Object.getOwnPropertyDescriptor(target, propertyKey) || {};
        if (descriptor.enumerable != value) {
            descriptor.enumerable = value;
            descriptor.writable= true;
            Object.defineProperty(target, propertyKey, descriptor)
        }
    };
}

用法:

class User {
    id:string;

    @enumerable(false)
    name: string;
}

测试:

   var user = new User();
   user.id = 1;
   user.name = 'John Doe';
   for (key in user){ console.log(key, user[key]);}

输出

id 1

不使用装饰器的相同测试

Same test without the use of the decorator

id 1
name John Doe

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10-13 18:51