JS累加器

 function Accumulator(){      var average = 0;     var length = 0;     var arr = [];     var sum = 0;     var max = Number.NEGATIVE_INFINITY;     var min = Number.POSITIVE_INFINITY;      this.add = function(val){         length++;         average = average + ( val - average ) / length;         sum += val;         if(val > max){             max = val;         }         if(val < min){             min = val;         }         arr.push(val);     }      this.size = function(){         return length;     }      this.getAverage = function(){         return average;     }      this.sum = function(){         return sum;     }      this.max = function(){         return max;     }      this.min = function(){         return min;     } }

文章来源: JS累加器