JavaScript 面向对象继承的实现

<script type="text/javascript">
 function Animal () {
     this.species="Animal";
 }
function Cat(name,color){
    this.name=name;
    this.color=color;
}
//Apply 将父类对象的构造函数赋值到子类上，Animal.apply(this,arguments);
 function Cat(name,color){
     this.name=name;
     this.color=color;
     Animal.apply(this,arguments);
 }
 var cat1=new Cat("大毛","黄色");
 alert(cat1.species);

//Prototype 子对象原型prototype赋值父类对象，并将子类对象原型的构造函数赋值为子类
Cat.prototype = new Animal();
Cat.prototype.constructor=Cat;
var cat1=new Cat("大毛","黄色");
alert(cat1.species);
</script>