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JavaScript设计模式-2高级类.

  1 <!DOCTYPE html>
  2 <html>
  3     <head>
  4         <meta charset="UTF-8">
  5         <title>javascript高级语法2-高级类</title>
  6     </head>
  7     <body>
  8         <script>
  9     /*        
 10             //在js中利用function来定义类。
 11             function Shape(){
 12                 var x=1;
 13                 var y=2;
 14             }
 15             //实例化对象;
 16             var a = new Shape();
 17             // 在类的内部用var定义的是私有变量。如何定义共有变量呢?
 18             function Shape2(){
 19                 this.x = 1;
 20                 this.y = 2;
 21             }
 22             var b = new Shape2();
 23             //this代表的是当前的实例。
 24             alert(a.x);  //undefined
 25             alert(b.x);  //1
 26             
 27             //除了定义私有变量外 还可以用var定义私有函数。
 28             function Shape3(){
 29                 var show=function(){
 30                     //私有函数
 31                 }
 32                 this.show2 = function(){
 33                     //公有函数
 34                 }
 35             }
 36             
 37             //用js模仿oop编程
 38              function Shape4(x,y){
 39                  var a = 0,b = 0;
 40                  //模仿oop编程的构造函数
 41                  var init = function(){
 42                      a = x;
 43                      b = y;
 44                  };
 45                  init();
 46                  
 47                  this.getX = function(){
 48                      return a;
 49                  }
 50              }
 51               var d = new Shape4(2,4);
 52               alert(d.getX());
 53               
 54               // js中的静态方法是作用到类身上的,而不是对象上
 55               function Person(){this.str = "zhangdan"}
 56               //静态变量
 57               Person.age = 10;
 58               Person.show = function(obj){
 59                   return obj.str    
 60               }
 61               alert(Person.show(new Person()));
 62               
 63             
 64              //简单类定义方法
 65              var a = {};
 66              var array = [];
 67              a["name"] = "zhangdan";
 68              alert(a.name);
 69              
 70    */            
 71                 //自定义map类
 72                 function jMap(){
 73                     //私有变量
 74                     var arr= {};
 75                     //增加
 76                     this.put = function(key,value){
 77                         arr[key] = value;
 78                     }
 79                     //查询
 80                     this.get = function(key){
 81                         if(arr[key]){
 82                             return arr[key]
 83                         }else{
 84                             return -1
 85                         }
 86                     }
 87                     //删除
 88                     this.remove = function(key){
 89                         delete arr[key]
 90                     }
 91                     //遍历
 92                     this.eachMap = function(fn){
 93                         for(var key in arr){
 94                             fn(key,arr[key]);
 95                         }
 96                     }
 97                 }
 98                 
 99                 var country =new jMap();
100                 country.put("01","zg");
101                 country.put("02","tg");
102                 country.put("03","mg");
103                 country.put("04","jnd");
104                 
105 //              alert(country.get("01"));
106                 
107                 country.eachMap(function(key,value){
108                     document.write(key+"-->"+value+"<br/>");
109                 })
110         </script>
111     </body>
112 </html>

 

JavaScript设计模式-2高级类.