var qseries =function(){};  qseries.prototype={   sum:function(){     var sum=null;  this.forEach(function(e){    var bfnADD= e?e.add!==undefined:false;    if(e instanceof Array){     e=qseries.array(e);    }    if(e instanceof qseries){    var r=e.sum();    var b1=r?r.add!==undefined:false;    if(b1){    sum=r.add(sum);    }else{     sum=sum+r;      }    }else{    if(bfnADD){      sum=e.add(sum);       }else{    sum=sum+e;    }    }  });      return sum;   }  }  qSeries.array = function (e) {  var series = new this();  if (e instanceof Array) {   e.forEach(function (a) {    series.push(a);   });  } else {   series.push(e);  }  return series;