javascript - 具有原型(prototype)的 parent 的多重继承

Question

javascript有没有办法继承多个类的原型(prototype):

前

function food(){
}

food.prototype.eat = function(){}

function plant(){
}

plant.prototype.grow = function(){}


function tomato(){
} // needs to have grow and eat methods (and if possible in proto type)

编辑:

不，西红柿不吃， eat方法意味着吃食物而不是食物吃掉你

Answer 1

我不明白为什么西红柿可以吃任何东西:)

但是，可以在 JavaScript 中实现某种多重继承。您只需要通过从两个父对象原型(prototype)中获取属性来扩展原型(prototype):

function Plant(name) {
  this.name = name;
}
Plant.prototype.grow = function() {
  document.write("<pre>" + this.name + " growing </pre>");
};

function Killer(name) {
  this.name = name;
}
Killer.prototype.eat = function() {
  document.write("<pre>" + this.name + " eating </pre>");
};

function Tomato(name) {
  this.name = name;
}

for (var key in Plant.prototype) {
  Tomato.prototype[key] = Plant.prototype[key];
}

for (var key in Killer.prototype) {
  Tomato.prototype[key] = Killer.prototype[key];
}

var killerTomato = new Tomato("yum-yum");

killerTomato.eat();
killerTomato.grow();