class Animal{

    eat():void{

        alert("animal eat");

    }

}

class Mamal extends Animal{

    breathe() :void{

        alert("Mamal breathe");

    }

}

class WingedAnimal extends Animal {

    fly() {

        alert("WingedAnimal fly");

    }

}

//模仿实现多继承 的函数方法

function applyMixins(derivedCtor:any,baseCtor:any[]) {

    //遍历父类中的所有的属性，添加到子类的属性中中

    baseCtor.forEach(baseCtor => {

        //获取遍历到的父类中的所有属性

        Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {

            if (name !== "constructor") {

                //父类中的属性，添加到子类的属性中

                derivedCtor.prototype[name] = baseCtor.prototype[name];

            }

        });

    });

}

//定义Bat类，

class Bat implements Mamal, WingedAnimal{

    fly: () => void;

    breathe: () => void;

    eat: () => void;//这个属性是访问不到

}

applyMixins(Bat, [Mamal, WingedAnimal]);

var bat = new Bat();

bat.fly();

bat.breathe();

bat.eat();//执行无结果，eat是Animal类的