js MAP

<!-- 
    var Map=function(){ 
        this.mapArr={}; 
        this.arrlength=0; 
 
        //假如有重复key，则不存入 
        this.put=function(key,value){ 
          if(!this.containsKey(key)){ 
           this.mapArr[key]=value; 
           this.arrlength=this.arrlength+1; 
          } 
        } 
        this.get=function(key){ 
          return this.mapArr[key]; 
        } 
 
        //传入的参数必须为Map结构 
        this.putAll=function(map){ 
           if(Map.isMap(map)){ 
               var innermap=this; 
               map.each(function(key,value){ 
                  innermap.put(key,value); 
               }) 
           }else{ 
             alert("传入的非Map结构"); 
           } 
        } 
        this.remove=function(key){ 
              delete this.mapArr[key]; 
              this.arrlength=this.arrlength-1; 
        } 
        this.size=function(){ 
             return this.arrlength; 
        } 
 
        //判断是否包含key 
        this.containsKey=function(key){ 
              return (key in this.mapArr); 
        } 
        //判断是否包含value 
        this.containsValue=function(value){ 
              for(var p in this.mapArr){ 
                 if(this.mapArr[p]==value){ 
                    return true; 
                 } 
              } 
              return false; 
        } 
        //得到所有key 返回数组 
        this.keys=function(){ 
           var keysArr=[]; 
           for(var p in this.mapArr){ 
             keysArr[keysArr.length]=p; 
           } 
           return keysArr; 
        } 
        //得到所有value 返回数组 
        this.values=function(){ 
          var valuesArr=[]; 
           for(var p in this.mapArr){ 
             valuesArr[valuesArr.length]=this.mapArr[p]; 
           } 
           return valuesArr; 
        } 
         
        this.isEmpty=function(){ 
           if(this.size()==0){ 
             return false; 
           } 
           return true; 
        } 
        this.clear=function(){ 
             this.mapArr={}; 
             this.arrlength=0; 
        } 
        //循环 
        this.each=function(callback){ 
            for(var p in this.mapArr){ 
             callback(p,this.mapArr[p]); 
           } 
 
        } 
         
 
    } 
    //判断是否是map对象 
    Map.isMap=function(map){ 
      return  (map instanceof Map); 
    } 
 
 
    var map=new Map(); 
    map.put("afei",25); 
    map.put("yaoming",31); 
    map.put("pp",2); 
    map.put("bill","55"); 
    map.remove("afei"); 
 
    var map2=new Map(); 
    map2.put("003",333); 
    map2.put("004",444); 
    map.putAll(map2); 
 
 
    map.each(function(key,value){ 
        alert(key+" : "+value); 
    }) 
 
 
     
//-->