【JS】访问器成员

前言

如下例,有一商品对象,其中属性分别为单价和数量以及一个用于计算总价的方法,需要通过 product.getTotal() 获得总价,也可以使用访问器成员getter控制属性读写逻辑,通过 product.total 的方式获取总价,提高可读性。

const product = {
    
    
  name: "iphone",
  price: 13999,
  count: 3,
  getTotal: function () {
    
    
    return this.price * this.count
  },
}

ES5

function Product(name, price, count) {
    
    
  this.name = name
  this.price = price
  this.count = count
}
Object.defineProperty(Product.prototype, "total", {
    
    
  get: function () {
    
    
    return this.price * this.count
  },
})

ES6

class Product {
    
    
  constructor(name, price, count) {
    
    
    this.name = name
    this.price = price
    this.count = count
  }
  get total() {
    
    
    return this.price * this.count
  }
}

Object

const p = {
    
    
  name: "iphone",
  price: 13999,
  count: 3,
  get total() {
    
    
    return this.price * this.count
  },
}

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转载自blog.csdn.net/owo_ovo/article/details/142656595