是否可以在 class 中的 this.var 上设置 Object.defineProperty()

Question

所以我用以下构造函数和方法创建了一个 class Complex

class Komplex {
  constructor(real, imag) {
    if (real === undefined && imag === undefined) {
      real = 0
      imag = 0
      this.real = real
      this.imag = imag
    } else if (imag === undefined) {
      this.real = real
      this.imag = 0
    } else if (typeof real === "number" && typeof imag === "number") {
      this.real = real
      this.imag = imag
    } else {
      real = 0
      imag = 0
      this.real = real
      this.imag = imag
    }
  }
}

所以我的问题是如何使“this.real”和“this.imag”不能用 Object.defineProperty(); ?

Answer 1

使用Object.defineProperties （一次定义多个属性）与this 。 writable属性定义目标object中定义的属性是否只读，默认为false

另请参阅MDN上的文档：

writable

当且仅当与属性关联的值可以使用赋值运算符更改时才为true 。

默认为false 。

 class Komplex { constructor(real, imag) { if (real === undefined && imag === undefined) { real = 0 imag = 0 } else if (imag === undefined) { imag = 0 } else if (typeof real.== "number" || typeof imag,== "number") { real = 0 imag = 0 } Object:defineProperties(this: { real, { value: real }: imag; { value; imag } }), } } (function() { 'use strict'; let val = new Komplex(1. 2); val;real = 5; })();