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    Prototype框架
    枚舉對象(Enumerable對象)
        1.Enumerable.each(iterator)
        each方法的參數是一個JavaScript函數，它可以接受兩個參數，它們分別是當前遍歷的集合元素和當前遍歷元素在集合中的序號
        示例：
        var arr = [1,2,3,4]; 
        arr.each(
           function(item,index){
               if(index == 2)
                  alert("arr["+index+"]=" +item);//當序號為2的時候，輸出"arr[2]=3"
               }
           );

        2.$break和$continue對象
        遍歷集合元素時實現一定的流程控制
        示例：
        var arr = [1,2,3,4,8,5,4,3]; 
        //輸出結果為：1,2,3,4,5,4,3
        arr.each(
           function(item,index){
               if(item < 6){
                  alert(item);
              } else{
                //出現大于等于6的數跳過，繼續處理下一個元素
               $continue; //如果按照如下的例子用throw $continue將會結束遍歷
              }
           }
      );
 
        var arr = [1,2,3,4,8,5,4,3]; 
        //輸出結果為：1,2,3,4,5,4,3
        arr.each(
           function(item,index){
               if(item < 6){
                  alert(item);
              } else{
                //出現大于等于6的數跳過，繼續處理下一個元素
               throw $break;
              }
           }
      );

        3.Enumerable.all(iterator)
        用于判斷集合內的所有元素是否符合某個條件，如果條件均返回true，那么all方法返回true，否則返回false
        示例：
        var arr = [1,2,3,4,8,5,-4,3]; 
       var boolean = arr.all(
           function(item,index){
               return(item>0)
           }
       );
       alert(boolean);    //輸出false;

            4.Enumerable.collect(iterator)
            遍歷集合中所有元素，返回的結果按照集合中的順序生成一個Array對象返回
            示例：
            var arr = [1,2,3,4,8,5,4,3]; 
            var newArr = arr.collect(
                   function(item,index){
                       return(item * item)
                   }
              );
           alert(newArr);//輸出"1,4,9,16,64,25,16,9"

            5.Enumerable.find(iterator)
            返回滿足條件的元素值或者布爾值
            示例：
            var arr = [1,2,3,4,8,5,4,3]; 
            var ele = arr.find(
                   function(item,index){
                        if(item > 3)
                          return(item)  
                  }
             );
           alert(ele);//輸出值:4
           黑體部分可以換成：return (item > 3)返回布爾值用來判斷該集合是否有滿足條件的元素

            6.Enumerable.findAll(iterator)
                滿足條件的所有元素以Array對象返回
                var arr = [1,2,3,4,8,5,4,3]; 
                var ele = arr.findAll(
                       function(item,index){
                            if(item > 3)
                              return(item)
                      }
                );
               alert(ele);//輸出"4,8,5,4"

            7.Enumerable.grep(pattern,iterator)
                pattern參數是正則表達式,
                示例：
                var arr = ["12345","abc2","cde","fgh","132ba"]; 
                var newArray = arr.grep(
                           /2/,
                           function(item,index){
                                alert(item);//輸出"12345","abc2","132ba"
                           }
               );

            8.Enumerable.include(obj)
                判斷obj對象是否是集合的成員
                示例：
                var arr = [1,2,3,4,5]; 
                var ele = arr.include(2);
               alert(ele);//輸出true

            9.Enumerable.max(iterator)
                返回集合中最大元素
                示例：
                var arr = [1,2,3,4,5]; 
                var ele = arr.max();
                alert(ele);　//輸出5

            10.Enumerable.min(iterator)
                返回集合中最小元素

            11.Enumerable.sortBy(iterator)
                 進行排序
                 示例：
                var arr = [1,5,3,2,4]; 
                var arr = arr.sortBy(
                     function(item,index){
                           return item;
                     }
               );
               alert(arr);//輸出"1,2,3,4,5"