JS中prototype属性-JS原型模式

 /*
  *对象方法
  *类方法
 * 原型方法
 */
     function People(name) {
         this.name = name;
         this.say = function () {  //对象方法
             alert("my name is  "+this.name);
         }
     }

     People.run = function () {  //类方法（静态方法，只能由类名调用）
         alert("i can run");
     }

     People.prototype.sayChinese = function () {//原型方法
         alert("我的名字是："+this.name);
     }

     var p1 = new People("menglinghua");
     p1.say();
     People.run();
     p1.sayChinese();

     p1.prototype  //无法获取？？？？？？？？
     p1.run();  //无法调用？？？
     p1.sayChinese(); //可以调用

     People.say();//无法调用？？？？？？？？
     People.sayChinese();//无法调用？？？？？？？？

     People.prototype.say();//无法调用？？？？？？？？
     People.prototype.run();//无法调用？？？？？？？？

 /*
 *eg1
 */
 function baseClass()
 {
     this.showMessage = function () {
         alert("baseClass::showMessage()");
     }
 }

 function extendClass()
 {

 }

 extendClass.prototype = new baseClass();
 var extendClassObj = new extendClass();
 extendClassObj.showMessage(); //输出"baseClass::showMessage()"

 /*
 *eg2 两个类含有同名方法
 */
 function baseClass() {
     this.showMessage = function () {
         alert("baseClass::showMessage( )");
     }
 }

 function extendClass() {
     this.showMessage = function () {
         alert("extendClass::showMessage( )");
     }
 }

 extendClass.prototype = new baseClass();
 var extendClassObj = new extendClass();
 extendClassObj.showMessage();  //输出"extendClass::showMessage( )"

 /*
 *eg3 让extendClass的实例调用baseClass的同名方法
 */
 function baseClass() {
     this.showMessage = function () {
         alert("baseClass::showMessage( )");
     }
 }

 function extendClass() {
     this.showMessage = function () {
         alert("extendClass::showMessage( )");
     }
 }

 extendClass.prototype = new baseClass();
 var extendClassObj = new extendClass();
 var baseClassObj = new baseClass();
 baseClassObj.showMessage.call(extendClassObj);//让【extendClassObj】调用【baseClassObj】的【showMessage】方法
 //输出："baseClass::showMessage( )" 

 /*
 *eg4
 */
 function baseClass()
 {
     this.showMessage = function () {
         alert("baseClass::showMessage( )");
     }
     this.baseShowMessage = function () {
         alert("baseClass::baseShowMessage");
     }
 }
 baseClass.showMessage = function () {
     alert("baseClass::showMessge static");
 }

 function extendClass()
 {
     this.showMessage = function () {
         alert("extendClass::showMessage( )");
     }
 }

 extendClass.prototype = new baseClass();
 var extendClassObj = new extendClass();

 extendClassObj.showMessage();//输出：extendClass::showMessage( )
 extendClassObj.baseShowMessage();//输出：baseClass::baseShowMessage

 baseClass.showMessage.call(extendClassObj);//输出：baseClass::showMessge static

 var baseClassObj = new baseClass();
 baseClassObj.showMessage.call(extendClassObj);//输出：baseClass::showMessage( )

http://www.cnblogs.com/yjf512/archive/2011/06/03/2071914.html