javascript Map工具类

Array.prototype.remove = function(s) {   
     for (var i = 0; i < this.length; i++) {   
         if (s == this[i]){   
             this.splice(i, 1);   
         }
     }   
 };function Map() {   
     
     this.keys = new Array();   
     
     this.data = new Object();   
      
     this.put = function(key, value) {   
         if(this.data[key] == null){   
             this.keys.push(key);   
         }   
         this.data[key] = value;   
     };   
      
     this.get = function(key) {   
         return this.data[key];   
     };   
       
     this.remove = function(key) {   
         this.keys.remove(key);   
         this.data[key] = null;   
     };  
      
     this.each = function(fn){   
         if(typeof fn != 'function'){   
             return;   
         }   
         var len = this.keys.length;   
         for(var i=0;i<len;i++){   
             var k = this.keys[i];   
             fn(k,this.data[k],i);   
         }   
     };   
       
     this.entrys = function() {   
         var len = this.keys.length;   
         var entrys = new Array(len);   
         for (var i = 0; i < len; i++) {   
             entrys[i] = {   
                 key : this.keys[i],   
                 value : this.data[i]   
             };   
         }   
         return entrys;   
     };   
         
     this.isEmpty = function() {   
         return this.keys.length == 0;   
     };   
       
     this.size = function(){   
         return this.keys.length;   
     };   
        
     this.toString = function(){   
         var s = "{";   
         for(var i=0;i<this.keys.length;i++,s+=','){   
             var k = this.keys[i];   
             s += k+"="+this.data[k]+"|";   
         }   
         s+="}";   
         return s;   
     };   
 };