js 面向对象2

面向对象的特征是封装 继承 多态 封装 

function animal() {
    var name;

    this.eat = function eat()
    { return 0; }
}

//继承
function cat() {
}

cat.prototype = new animal();

function cat() {
    this.eat = function eat()
    { return 0; }
}

cat.prototype = new animal();

function dog() {
    this.eat = function eat()
    { return 0; }
}

dog.prototype = new animal();

//多态
var cat1 = new cat(); cat1.name = "jiafei";

var dog1 = new dog(); dog1.name = "odi";

var list = [cat1, dog1];