ES5 实现继承
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| function Animal(name) {
this.name = name;
}
Animal.prototype.speak = function() {
console.log(this.name + ' makes a noise.');
};
function Dog(name, breed) {
Animal.call(this, name);
this.breed = breed;
}
Dog.prototype = Object.create(Animal.prototype);
Dog.prototype.constructor = Dog;
Dog.prototype.bark = function() {
console.log(this.name + ' barks.');
};
var dog = new Dog('Rex', 'Labrador');
dog.speak(); // 输出: Rex makes a noise.
dog.bark(); // 输出: Rex barks.
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ES6 实现继承（不同 class 和 extends）
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| function Foo() { }
function Bar() { }
Object.setPrototypeOf(Bar.prototype, Foo.prototype);
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