下例中Vegetable视为父类，Celery视为子类。
Vegetable 拥有属性taste, 方法fun1
Celery 拥有属性 color, 方法fun2，如果再定义与Vegetable 中同名的属性或方法，则会覆盖父类Vegetable 中对应的属性和方法。
function Vegetable(){
this.taste='delicious';
this.fun1 = function(){
alert('Vegetable fun1 doing...');
}
}
function Celery(){
this.color = 'green';
this.taste = 'bad';
this.fun1 = function(){
alert('Celeryfun1 doing...');
}
this.fun2 = function(){
alert('Celery fun2 doing...');
}
}
Celery.prototype = new Vegetable();
var stick = new Celery();
var polymorphed = stick.taste;
alert(polymorphed);
alert(stick.color);
stick.fun1();
stick.fun2();下载本文