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。
javascript
const product = {
name: "iphone",
price: 13999,
count: 3,
getTotal: function () {
return this.price * this.count
},
}
ES5
javascript
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
javascript
class Product {
constructor(name, price, count) {
this.name = name
this.price = price
this.count = count
}
get total() {
return this.price * this.count
}
}
Object
javascript
const p = {
name: "iphone",
price: 13999,
count: 3,
get total() {
return this.price * this.count
},
}