SOURCE

function Animal(){
　　　　this.species = "动物";
　　}


function Cat(name,color){
　　　　this.name = name;
　　　　this.color = color;
　　}


var F = function(){};
F.prototype = Animal.prototype;
Cat.prototype = new F();
Cat.prototype.constructor = Child;



var cat1 = new Cat('1','2');

console.log(2222)
console.log(cat1.species)