JavaScript中的获取器和设置器(正确的语法?) [英] Getters and Setters in JavaScript (Correct syntax ?)

问题描述

我是JavaScript的新手，但通常对OOP都不是.

I am new to JavaScript, but not to OOP in general.

这是创建吸气剂的有效方法吗? JavaScript中的二传手?

Is this a valid way of creating getters & setters in JavaScript?

类"，

function Person (age){
    this.age = age;
};

Getter，

Person.prototype.getAge = function(){
    return this.age;
};

和二传手.

Person.prototype.setAge = function(arg){
    this.age = arg;
};

它似乎工作正常，但我不知道约定，我到处都有不同的描述，但是我的解决方案有效吗?

It seems to work fine, but I dont know the convention, I get diffrent descriptions everywhere, but is my solution valid?

推荐答案

您可能想要Object.defineProperty(

You probably want Object.defineProperty (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty), here's an example of it in use:

Object.defineProperty(Person.prototype, 'age', {
  get: function(){
    return this.__age__;
  },
  set: function(value){
    this.__age__ = value;
  }
});

如果需要，还可以在其他位置保存变量.以下内容将作为在Person的所有实例中设置和访问的单例值:

You can also hold a variable somewhere else if you want. The following would act as a singleton value that is set and accessed across all instances of Person:

var age;

Object.defineProperty(Person.prototype, 'age', {
  get: function(){
    return age;
  },
  set: function(value){
    age = value;
  }
});

如果要为创建的Person对象的每个实例提供age变量，则需要在构造函数中添加变量声明:

If you want an age variable for every instance of the Person objects you create, you need to add the variable declaration inside your constructor:

function Person(){
  var age; 
  // ditto from the second example
}

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