JS中prototype属性-JS原型模式

  1 /*
  2  *对象方法
  3  *类方法
  4 * 原型方法
  5 */
  6     function People(name) {
  7         this.name = name;
  8         this.say = function () {  //对象方法
  9             alert("my name is  "+this.name);
 10         }
 11     }
 12
 13     People.run = function () {  //类方法（静态方法，只能由类名调用）
 14         alert("i can run");
 15     }
 16
 17     People.prototype.sayChinese = function () {//原型方法
 18         alert("我的名字是："+this.name);
 19     }
 20
 21     var p1 = new People("menglinghua");
 22     p1.say();
 23     People.run();
 24     p1.sayChinese();
 25
 26     p1.prototype  //无法获取？？？？？？？？
 27     p1.run();  //无法调用？？？
 28     p1.sayChinese(); //可以调用
 29
 30     People.say();//无法调用？？？？？？？？
 31     People.sayChinese();//无法调用？？？？？？？？
 32
 33     People.prototype.say();//无法调用？？？？？？？？
 34     People.prototype.run();//无法调用？？？？？？？？
 35
 36
 37 /*
 38 *eg1
 39 */
 40 function baseClass()
 41 {
 42     this.showMessage = function () {
 43         alert("baseClass::showMessage()");
 44     }
 45 }
 46
 47 function extendClass()
 48 {
 49
 50 }
 51
 52 extendClass.prototype = new baseClass();
 53 var extendClassObj = new extendClass();
 54 extendClassObj.showMessage(); //输出"baseClass::showMessage()"
 55
 56
 57 /*
 58 *eg2 两个类含有同名方法
 59 */
 60 function baseClass() {
 61     this.showMessage = function () {
 62         alert("baseClass::showMessage( )");
 63     }
 64 }
 65
 66 function extendClass() {
 67     this.showMessage = function () {
 68         alert("extendClass::showMessage( )");
 69     }
 70 }
 71
 72 extendClass.prototype = new baseClass();
 73 var extendClassObj = new extendClass();
 74 extendClassObj.showMessage();  //输出"extendClass::showMessage( )"
 75
 76 /*
 77 *eg3 让extendClass的实例调用baseClass的同名方法
 78 */
 79 function baseClass() {
 80     this.showMessage = function () {
 81         alert("baseClass::showMessage( )");
 82     }
 83 }
 84
 85 function extendClass() {
 86     this.showMessage = function () {
 87         alert("extendClass::showMessage( )");
 88     }
 89 }
 90
 91 extendClass.prototype = new baseClass();
 92 var extendClassObj = new extendClass();
 93 var baseClassObj = new baseClass();
 94 baseClassObj.showMessage.call(extendClassObj);//让【extendClassObj】调用【baseClassObj】的【showMessage】方法
 95 //输出："baseClass::showMessage( )"
 96
 97 /*
 98 *eg4
 99 */
100 function baseClass()
101 {
102     this.showMessage = function () {
103         alert("baseClass::showMessage( )");
104     }
105     this.baseShowMessage = function () {
106         alert("baseClass::baseShowMessage");
107     }
108 }
109 baseClass.showMessage = function () {
110     alert("baseClass::showMessge static");
111 }
112
113 function extendClass()
114 {
115     this.showMessage = function () {
116         alert("extendClass::showMessage( )");
117     }
118 }
119
120 extendClass.prototype = new baseClass();
121 var extendClassObj = new extendClass();
122
123 extendClassObj.showMessage();//输出：extendClass::showMessage( )
124 extendClassObj.baseShowMessage();//输出：baseClass::baseShowMessage
125
126 baseClass.showMessage.call(extendClassObj);//输出：baseClass::showMessge static
127
128 var baseClassObj = new baseClass();
129 baseClassObj.showMessage.call(extendClassObj);//输出：baseClass::showMessage( )

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