<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]; } dice(){ this.r1=6*Math.random(); this.d1=Math.floor(this.r1)+1; this.r1=6*Math.random(); this.d2=Math.floor(this.r1)+1; return this.d1+this.d1 } } </script> <script> function sample(){ var delta=new Array(); var a=new f(); c=a.dice(); $("#memo").html(c); } </script>