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js写的Hashtable类

Posted on 2006-08-16 23:22 ☆蓝色梦想☆ 阅读(269) 评论(0)  编辑  收藏 所属分类: AJAX
< script language = " javascript "  type = " text/javascript " >

function  Hashtable()
{
     this ._hash         =   new  Object();
     this .add         =   function (key,value){
                         if ( typeof (key) != " undefined " ){
                             if ( this .contains(key) == false ){
                                 this ._hash[key] = typeof (value) == " undefined " ? null :value;
                                 return   true ;
                            }  else  {
                                 return   false ;
                            }
                        }  else  {
                             return   false ;
                        }
                    }
     this .remove         =   function (key){ delete   this ._hash[key];}
     this .count         =   function (){ var  i = 0 ; for ( var  k  in   this ._hash){i ++ ;}  return  i;}
     this .items         =   function (key){ return   this ._hash[key];}
     this .contains     =   function (key){  return   typeof ( this ._hash[key]) != " undefined " ;}
     this .clear         =   function (){ for ( var  k  in   this ._hash){ delete   this ._hash[k];}}

}

 var  a  =   new  Hashtable();

a.add( " aa " );
a.add( " bb " , 2342 );
a.add( " bb " , 2342 );

a.remove( " aa " );

alert(a.count());

alert(a.contains( " bb " ));

alert(a.contains( " aa " ));

alert(a.items( " bb " ));


 </ script >

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