JavaScript ¹¹½¨ÀàºÍ´´½¨¶ÔÏóµÄ·½Ê½

1>¹¤³§º¯ÊýÀ´´´½¨¶ÔÏó(Factory)
     function createCar(){
var obj = new Object;
obj.name = "BWM";
obj.show = function(){
alert(this.name);
}
return obj;
}
var car1 = createCar();
var car2 = createCar();
car1.show();
car2.show();
2>¹¹Ô캯Êý´´½¨¶ÔÏó(Constructor)
     function Car(name){
this.name = name;
this.show = function(){
alert(this.name);
}
}
Car.prototype.say = function(){
alert("hello");
}
var car = new Car("BMW");
car.show();
car.say();
3>Ô­ÐÍ£¨prototype£©´´½¨¶ÔÏó
      function Car(){}
Car.prototype.name = "BMW";
Car.prototype.show = function(){
alert(this.name);
}
Car.prototype.say = function(){
alert("Hiloo");
}
var car = new Car();
car.show(); car.say();
4>¹¹Ôì && Ô­ÐÍ£ºÍƼöʹÓ㬵«ÊÇÀí½âÆðÀ´ÓеãÄ£ºý
     /*
¹¹Ô캯ÊýÊÇÀ´³õʼ»¯·Çº¯ÊýÊôÐÔµÄ
*/
function Car(name){
this.name = name;
}
Car.prototype.show = function(){
alert(this.name);
}
Car.prototype.say = function(){
alert("hiloo");
}
var car = new Car("BMW");
car.show(); car.say();
5>Dynamic Prototype£ºÀàËÆÓÚjavaÖÐÀàµÄ´´½¨£¬ÊÇѧϰ¹ýJavaÓïÑÔ³ÌÐòÔ±³£Óõķ½Ê½
    function Car(name){
this.name = name;
if(typeof Car._initialized == "undefined"){
Car.prototype.show = function(){
alert(this.name);
}
Car._initialized = true;//¸Ä±äÄ¿µÄÊÇ£¬Ö´ÐÐÒ»´Î
}
}
var car = new Car("BMW");
car.show();