js实现map结构

//定义map     function Map()     {      this.container = {};      }        //将key-value放入map中     Map.prototype.put = function(key,value){      try{          if(key!=null && key != "")       this.container[key] = value;        }catch(e){      return e;      }      };        //根据key从map中取出对应的value     Map.prototype.get = function(key){      try{        return this.container[key];        }catch(e){      return e;      }      };        //判断map中是否包含指定的key     Map.prototype.containsKey=function(key){       try{      for(var p in this.container)      {         if(this.p==key)            return true;      }        return false;       }catch(e){      return e;     }       }       //判断map中是否包含指定的value     Map.prototype.containsValue = function(value){      try{        for(var p in this.container)     {      if(this.container[p] === value)         return true;      }        return false;        }catch(e){      return e;      }      };          //删除map中指定的key     Map.prototype.remove = function(key){      try{        delete this.container[key];        }catch(e){      return e;      }      };        //清空map     Map.prototype.clear = function(){      try{      delete this.container;      this.container = {};        }catch(e){        return e;      }      };        //判断map是否为空     Map.prototype.isEmpty = function(){          if(this.keyArray().length==0)       return true;     else        return false;     };        //获取map的大小     Map.prototype.size=function(){       return this.keyArray().length;     }       //返回map中的key值数组     Map.prototype.keyArray=function(){         var keys=new Array();       for(var p in this.container)       {           keys.push(p);       }           return keys;     }       //返回map中的value值数组     Map.prototype.valueArray=function(){          var values=new Array();       var keys=this.keyArray();       for(var i=0;i<keys.length;i++)       {          values.push(this.container[keys[i]]);       }              return values;     } 

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