Javascript写的Hashtable类

<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("a","111aaa");
alert(a.items("a"));
//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>