<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <script> class f{ plus(){ return this.delta[1]+this.delta[2]; } } </script> <script> function sample(){ var delta=new Array(); delta[1]="a"; delta[2]="b"; var a=new f(); a.delta=delta c=a.plus(); $("#memo").html(c); } </script>