# 在 js 中如何实现继承
Issue
欢迎在 Issue 中交流与讨论: Issue 382 (opens new window)
Author
有以下两种方法可实现继承
# class
/extends
class Animal {
constructor (name) {
this.name = name
}
hello () {
console.log('hello')
}
}
class Dog extends Animal {
constructor (name, say) {
super(name)
this.say = say
}
}
# function
/new
function Animal (name) {
this.name = name
}
Animal.prototype.hello = () => {
console.log('hello')
}
function Dog (name, say) {
// 01 继承属性
Animal.call(this, name)
this.say = say
}
// 02 通过连接原型链完成继承
Dog.prototype = Object.create(Animal.prototype)
// 03 再加上 constructor
Dog.prototype.constructor = Dog
// Reflect.defineProperty(Dog.prototype, "constructor", {
// value: Dog,
// enumerable: false, // 不可枚举
// writable: true
// })