什么是ES6类getter和setter呢？ [英] what are ES6 class getter and setter actually?

问题描述

ES6类定义中实际的getter和setter方法是什么？他们是原型道具吗？ for examle：

what are actually getter and setter methods in ES6 class definition? are they infact prototype props ? for examle:

class Person{
  constructor(){};
  get name(){
    return 'jack';
  }
  set name(){
    // ???
  }
}

这是否等于Person.prototype.name ='杰克';

does this equals to Person.prototype.name = 'jack';

另一个问题，我看过使用实例的道具的setter的例子：

and another question, i ve seen examples of setters which utilizes the instance's prop like:

class Person{
  constructor(){
    this._name = 'jack';
  };
  get name(){
    return this._name;
  }
  set name(val){
    this._name = val;
  }
}

我不想这样做，我想要类似的东西：

i dont wanna do this way, i want something like:

class Person{
  constructor(){};
  get name(){
    return 'jack';
  }
  set name(val){
    // like this
    // name = val;
  }
}

可以做些什么？

推荐答案

是的，可以这样做：只需删除setter / getter语法并在初始化期间向类添加属性：

Yes, it can be done: Just drop the setter/getter syntax and add a property to the class during initialization instead:

class Person{
    constructor(name){
        this.name = name;
    }
}

必须使用的属性的getter / setter语法根据其他属性计算，例如来自给定半径的圆圈的区域属性：

The getter/setter syntax exists for properties that must be calculated based on other properties, like the area property from a circle of a given radius:

class Circle {
    constructor (radius) {
        this.radius = radius;
    }
    get area () {
        return Math.PI * this.radius * this.radius;
    }
    set area (n) {
        this.radius = Math.sqrt(n / Math.PI);
    }
}

或者获取<$ c $的全名c> Person 具有 firstName 和 lastName 属性的对象。你明白了。

Or getting the full name of a Person object with firstName and lastName properties. You get the idea.

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