JS对象冒充为什么不能继承属性？

function Animal(name,age){ this.name=name; this.age=age; this.eat=function(){ alert ("小明吃吃吃"); } } function Dog(name,age){ this.song=Animal; this.song(name.age); } var dog1=new Dog("小明",27); dog1.eat(); alert (dog1.age); alert (dog1.name);

this.song(name.age);
===>
this.song(name,age); 别写错符号了，是逗号