# 在 js 中如何实现继承
Issue
欢迎在 Gtihub Issue 中回答此问题: 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
// })